Vaughan_189-198.indd INTRODUCTION The South African Association for Marine Biological Research, incorporating Sea World, Oceanographic Research Institute and the Dolphinarium relocated from their old premises of 46 years on Durban’s beach front in March and April 2004 to the new Point Development’s marine theme park, uShaka Marine World in Durban, South Africa. Netting of fishes from the large exhibits could cause physical damage to struggling fishes, increasing the risk of opportunistic secondary bacterial infections (Inoue, dos Santos Neto & Morales 2004) which could not be treated in time for the opening of uShaka Marine World on 30 April 2004. An ideal method to facilitate the removal of fishes from exhibits would be the use of a general anaesthetic. Characteristics of a suitable anaes- thetic for this purpose would include ease of admin- istration and stability, rapid recovery of anaesthe- tised fishes once re-introduced into untreated water and the dependency of anaesthetic duration upon concentration (Dunn & Koester 1985). “2-Phenoxy- eth a nol” (MercK Laboratories, Johannesburg) was selected to facilitate the removal of fishes from the two main aquarium exhibits, the open ocean exhibit, housing the highest diversity of fishes (Table 1), and the shark tank housing two large adult Zambezi sharks, Carcharhinus leucas Valenciennes, 1839, eight adult Spotted ragged-tooth sharks, Carcharias taurus Rafinesque, 1810, and several sympatric tel- eost species (Table 2). 2-Phenoxyethanol is rela- tively inexpensive and remains viable in long-term exposure (Kaiser & Vine 1998) and is also available in bulk in South Africa. Deacon, White & Hecht (1997) recommend 2-Phenoxyethanol as a highly suitable anaesthetic for repeatedly exposed fishes. 2-Phenoxyethanol also showed a more notable se- dation than MS-222 in an experiment on Gilthead sea bream, Sparus aurata (Molinero & Gonzalez 1995) and is considered a desirable anaesthetic for the transportation of fishes by Yanar & Kumlu (2001). 189 Onderstepoort Journal of Veterinary Research, 75:189–198 (2008) 2-Phenoxyethanol as anaesthetic in removing and relocating 102 species of fishes representing 30 families from Sea World to uShaka Marine World, South Africa D.B. VAUGHAN¹*, M.R. PENNING² and K.W. CHRISTISON³ ABSTRACT VAUGHAN, D.B., PENNING, M.R. & CHRISTISON, K.W. 2008. 2-Phenoxyethanol as anaesthetic in removing and relocating 102 species of fishes representing 30 families from Sea World to uShaka Marine World, South Africa. Onderstepoort Journal of Veterinary Research, 75:189–198 2-Phenoxyethanol was used as an anaesthetic to translocate 102 species of fishes representing 30 families from the Sea World aquarium on Durban’s beachfront to uShaka Marine World. Most fishes responded well to a final anaesthetic concentration of 0,150 mℓ/ℓ and there were no mortalities. Keywords: Anaesthetic, fishes, 2-Phenoxyethanol, public aquarium, translocation * Author to whom correspondence is to be directed. Email: dvaughan@aquarium.co.za 1 Two Oceans Aquarium, Dock Road, Victoria and Alfred Water- front, Cape Town, 8000 South Africa 2 South African Association for Marine Biological Research, uShaka Marine World, 1 King Shaka Avenue, Point precinct, Durban, 4000 South Africa 3 Department of Biodiversity and Conservation Biology, Univer- sity of the Western Cape, Private Bag X17, Bellville, 7535 South Africa Accepted for publication 21 April 2008—Editor 190 2-Phenoxyethanol as anaesthetic in relocating fi shes Pole syringe anaesthetic technique using ketamine hydrochloride and xylazine hydrochloride was not feasible for facilitating translocation of the C. leucas, and C. taurus, weighing in excess of 170 kg each because of the restriction in dart-syringe size and therefore efficient dosage administration. Repeated darting could not guarantee successful induction or the safety of the operator. Each exhibit of fishes was moved separately on different days. MATERIAL AND METHODS The shark tank was first to have its animals relo- cated on 13 April 2004. The fishes in the open ocean exhibit were relocated 2 days later. Incoming sea- water supplies and filtration systems were shut down. Aeration of both exhibits was maintained for circulation and sustaining desirable dissolved oxy- gen levels during the procedure. The shark tank and the open ocean exhibit volumes were calculated at 386 400 ℓ and 850 500 ℓ, respectively. Temperature, dissolved oxygen and pH levels were monitored us- ing a YSI 85 hand-held temperature, dissolved oxy- gen, conductivity and salinity meter, and a Cyberscan pH and ORP meter. 2-Phenoxyethanol was thoroughly mixed with tap water in 450 ℓ plastic drums alongside the exhibits and poured directly into the water. Concentration increments of 0.050 mℓ/ℓ, equating to 19.32 ℓ of 2-Phenoxyethanol, were added every 30 min to the shark tank to a final concentration of 0.150 mℓ/ℓ. The initial concentration for the open ocean exhibit was 0.030 mℓ/ℓ equating to 25 ℓ of 2-Phenoxyethanol. After 30 min, increments of 0.006 mℓ/ℓ (5 ℓ of 2-Phenoxyethanol) were added every 15 min until the concentration of 0.150 mℓ/ℓ was obtained. The concentration was increased to 0.250 mℓ/ℓ only to anaesthetise the last fish species, Cobia, Rachy cen- tron canadum Linnaeus, 1776, once all other fishes had been removed. Small concentration increments spread over a longer period of time in the open ocean exhibit enabled specific species of fishes of a higher diversity than the shark tank to be removed upon their potential differences in reaction to con- centrations and exposure times to 2-Phenoxyeth a- nol. Excitation events were recorded and the fishes were removed according to their effective induction to an- aesthesia upon loss of equilibrium. The Zambezi sharks were guided into PVC stretchers upon the first signs of anaesthesia, after which the Spotted ragged-tooth sharks were similarly removed, to pre- vent physical injury to themselves through collision with tank walls and viewing panels. All other anaes- thetised fishes were collected in transparent PVC bags by a team of divers. They were removed to awaiting transport tanks containing 2 000 ℓ, 4 000 ℓ or 8 000 ℓ volumes of seawater on the back of two flatbed trucks to be delivered in relay to the new aquarium exhibits. All the transport tanks except one of 2 000 ℓ capacity, contained a 2-Phenoxy etha- nol concentration of 0.100 mℓ/ℓ. The untreated trans- port tank was reserved for potentially sensitive spe- cies to the affects of the 2-Phenoxethanol, so that they could be revived quickly to prevent possible mortalities. All transport tanks were separately fil- tered using diatom cartridge filters on pump-recircu- lation, and oxygenated using medical-grade oxygen diffused directly into the water via airstones and flexible gas tubing. After transporting and delivery of two loads of fishes to the new aquarium, all the sea- water in the transport tanks was drained and re- placed and re-dosed with 2-Phenoxyethanol at the same concentration. RESULTS/OBSERVATIONS Water quality parameters throughout the exercise for both exhibits were similar and relatively stable. Temperatures for both exhibits remained unchanged at 22.6 °C, and 22.9 °C for the open ocean exhibit and shark tank, respectively, with a stable pH for each exhibit at 7.77 and 7.86 throughout the exer- cise. Dissolved oxygen levels were measured at the anaesthetic induction time per species. One hun- dred and two species of fishes representing 30 fam- ilies were successfully anaesthetised using 2-Phen- oxy ethanol (Tables 1 and 2). Both Zambezi sharks displayed excitation at 0.100 mℓ/ℓ at 50 min, charac- terised by a marked increase in swimming speed, and became disorientated at 0.150 mℓ/ℓ at 72.9 % dissolved oxygen and 70 min, when they were re- moved promptly to avoid injury. None of the Spotted Ragged-tooth sharks showed any changes in be- haviour throughout the procedure and were re- moved from the shark tank after both C. leucas were removed. The remaining fishes were removed by the team of divers from the shark tank after all the sharks had been removed. All species of the family Carangidae (Kingfishes) from the shark tank displayed excitation (Table 2), yet this was completely absent in all the carangid species in the open ocean exhibit anaesthetised at the same final concentration of 0.150 mℓ/ℓ (Table 1). The Crocodile needlefish, Tylosurus crocodilus croc- o dilus Peron & LeSueur, 1821, from the open ocean 191 D.B. VAUGHAN, M.R. PENNING & K.W. CHRISTISON T A B L E 1 F is h e s a n a e st h e tis e d a n d r e m o ve d f ro m t h e o p e n o ce a n e xh ib it a t S e a W o rl d S c ie n ti fi c n a m e s E n g li s h n a m e s N u m b e rs E x c it a ti o n l e v e l A n a e s th e ti c l e v e l/ in d u c ti o n t im e F a m il y : A lb u li d a e ( B o n e fi s h e s ) A lb u la v u lp e s L in n a e u s, 1 7 5 8 B o n e fis h 5 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : B e lo n id a e ( N e e d le fi s h e s ) T yl o su ru s cr o co d ilu s cr o co d ilu s P e ro n & L e S u e u r, 1 8 2 1 C ro co d ile n e e d le fis h 1 0 .0 4 8 m ℓ/ ℓ; 7 5 m in 0 .0 4 8 m ℓ/ ℓ; 7 5 m in F a m il y : S e rr a n id a e ( R o c k c o d s ) C e p h a lo p h o lis s o n n e ra ti V a le n ci e n n e s, 1 8 2 8 T o m a to r o ck co d 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in E p in e p h e lu s ca e ru le o p u n ct a tu s B lo ch , 1 7 9 0 W h ite sp o tt e d r o ck co d 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : H a e m u li d a e ( R u b b e rl ip s a n d G ru n te rs ) P le ct o rh in ch u s ch u b b i R e g a n , 1 9 1 9 D u sk y ru b b e rl ip s 3 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P le ct o rh in ch u s g ib b o su s L a ce p e d e , 1 8 0 2 H a rr y h o tli p s 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P le ct o rh in ch u s p la yf a ir i P e lle g ri n , 1 9 1 4 W h ite b a rr e d r u b b e rl ip s 3 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P o m a d a sy s co m m e rs o n n ii L a ce p e d e , 1 8 0 1 S p o tt e d g ru n te r 5 5 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P o m a d a sy s ka a ka n C u vi e r, 1 8 3 0 Ja ve lin g ru n te r 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P o m a d a sy s m a cu la tu m B lo ch , 1 7 9 7 S a d d le g ru n te r 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P o m a d a sy s m u lti m a cu la tu m P la yf a ir , 1 8 6 6 C o ck g ru n te r 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P o m a d a sy s st ri a tu m G ilc h ri st & T h o m p so n , 1 9 0 8 S tr ip e d g ru n te r 5 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : L u tj a n id a e ( S n a p p e rs ) L u tja n u s b o h a r F o rs sk a l, 1 7 7 5 T w in sp o t sn a p p e r 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in L u tja n u s g ib b u s F o rs sk a l, 1 7 7 5 H u m p b a ck s n a p p e r 8 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in L u tja n u s ka sm ir a F o rs sk a l, 1 7 7 5 B lu e b a n d e d s n a p p e r 7 7 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in L u tja n u s ru ss e lli i B le e ke r, 1 8 4 9 R u ss e ll’ s sn a p p e r 7 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : S p a ri d a e ( S e a b re a m s ) A ca n th o p a g ru s b e rd a F o rs sk a l, 1 7 7 5 R iv e rb re a m 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C h ry so b le p h u s p u n ic e u s G ilc h ri st & T h o m p so n , 1 9 0 8 S lin g e r 1 9 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in D ip lo d u s ce rv in u s h o tt e n to tu s S m ith , 1 8 4 4 Z e b ra 1 4 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in D ip lo d u s sa rg u s ca p e n si s S m ith , 1 8 4 4 B la ck t a il 1 7 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P a ch ym e to p o n g ra n d e G u n th e r, 1 8 5 9 B ro n ze b re a m 4 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P a g e llu s b e llo tt ii n a ta le n si s S te in d a ch n e r, 1 9 0 2 R e d t jo r- tjo r 7 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P o ly st e g a n u s p ra e o rb ita lis G u n th e r, 1 8 5 9 S co ts m a n 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in R h a b d o sa rg u s h a lu b i S te in d a ch n e r, 1 8 8 1 C a p e s tu m p n o se 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in R h a b d o sa rg u s sa rb a F o rs sk a l, 1 7 7 5 N a ta l s tu m p n o se 6 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in 192 2-Phenoxyethanol as anaesthetic in relocating fi shes S c ie n ti fi c n a m e s E n g li s h n a m e s N u m b e rs E x c it a ti o n l e v e l A n a e s th e ti c l e v e l/ in d u c ti o n t im e F a m il y : L e th ri n id a e ( E m p e ro rs ) G n a th o d e n te x a u re o lin e a tu s L a ce p e d e , 1 8 0 2 G lo w fis h 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in L e th ri n u s cr o ci n e u s S m ith , 1 9 5 9 Y e llo w fin e m p e ro r 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in L e th ri n u s h yp se lo p te ru s B le e ke r, 1 8 7 3 M o za m b iq u e e m p e ro r 4 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in L e th ri n u s n e b u lo su s F o rs sk a l, 1 7 7 5 B lu e e m p e ro r 1 0 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in L e th ri n u s sa n g u in e u s S m ith , 1 9 5 5 C u tt h ro a t e m p e ro r 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : C o ra c in id a e ( G a lj o e n s ) C o ra ci n u s m u lti fa sc ia tu s P e lle g ri n , 1 9 1 4 B a n d e d g a ljo e n 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : K y p h o s id a e ( S e a c h u b s ) K yp h o su s b ig ib b u s L a ce p e d e , 1 8 0 1 G re y ch u b 4 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : E p h ip p id a e ( B a tf is h e s ) P la ta x p in n a tu s L in n a e u s, 1 7 5 8 D u sk y b a tf is h 3 4 N o n e o b se rv e d 0 .0 6 0 m ℓ/ ℓ; 1 0 5 m in F a m il y : M o n o d a c ty li d a e ( M o o n ie s ) M o n o d a ct yl u s fa lc ifo rm is L a ce p e d e , 1 8 0 0 C a p e M o o n y 1 4 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : M u ll id a e ( G o a tf is h e s ) P a ru p e n e u s m a cr o n e m a L a ce p e d e , 1 8 0 1 B a n d -d o t g o a tf is h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : P o m a c a n th id a e ( A n g e lf is h e s ) A p o le m ic h th ys t ri m a cu la tu s L a ce p e d e , 1 8 3 1 T h re e sp o t a n g e lfi sh 3 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P o m a ca n th u s im p e ra to r B lo ch , 1 7 8 7 E m p e ro r a n g e lfi sh 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : C h a e to d o n ti d a e ( B u tt e rf ly fi s h e s ) C h a e to d o n a u ri g a F o rs sk a l, 1 7 7 5 T h re a d fin b u tt e rf ly fis h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C h a e to d o n g u tt a tis si m u s B e n n e tt , 1 8 2 3 G o rg e o u s g u ss y 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C h a e to d o n lu n u la L a ce p e d e , 1 8 0 3 H a lfm o o n b u tt e rf ly fis h 4 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C h a e to d o n u n im a cu la tu s B lo ch , 1 7 8 7 L im e sp o t b u tt e rf ly fis h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C h a e to d o n k le in ii B lo ch , 1 7 9 0 W h ite sp o tt e d b u tt e rf ly fis h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C h a e to d o n m a d a g a sk a ri e n si s A h l, 1 9 2 3 P e a rl y b u tt e rf ly fis h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C h a e to d o n m a rl e yi R e g a n , 1 9 2 1 D o u b le sa sh b u tt e rf ly fis h 3 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C h a e to d o n v a g a b u n d u s L in n a e u s, 1 7 5 8 V a g a b o n d b u tt e rf ly fis h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F o rc ip ig e r fla vi ss im u s Jo rd a n & M cG re g o r, 1 8 9 8 L o n g n o se b u tt e rf ly fis h 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in H e n io ch u s m o n o ce ro s C u vi e r, 1 8 3 1 M a sk e d c o a ch m a n 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in T A B L E 1 co n tin u e d 193 D.B. VAUGHAN, M.R. PENNING & K.W. CHRISTISON S c ie n ti fi c n a m e s E n g li s h n a m e s N u m b e rs E x c it a ti o n l e v e l A n a e s th e ti c l e v e l/ in d u c ti o n t im e F a m il y : O p le g n a th id a e ( K n if e ja w s ) O p le g n a th u s ro b in so n i R e g a n , 1 9 1 6 N a ta l k n ife ja w 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : C a ra n g id a e ( K in g fi s h e s ) C a ra n g o id e s ca e ru le o p in n a tu s R u p p e ll, 1 8 3 0 C o a st a l k in g fis h 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C a ra n g o id e s fu lv o g u tt a tu s F o rs sk a l, 1 7 7 5 Y e llo w sp o tt e d k in g fis h 4 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C a ra n x se xf a sc ia tu s Q u o y & G a im a rd , 1 8 2 5 B ig -e ye k in g fis h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in M e g a la sp is c o rd yl a L in n a e u s, 1 7 5 8 T o rp e d o s ca d 1 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P se u d o ca ra n x d e n te x B lo ch & S ch n e id e r, 1 8 0 1 W h ite k in g fis h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in T ra ch in o tu s a fr ic a n u s S m ith , 1 9 6 7 S o u th e rn p o m p a n o 3 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in T ra ch in o tu s b o tla S h a w , 1 8 0 3 L a rg e s p o t p o m p a n o 1 0 N o n e o b se rv e d 0 .0 7 2 m ℓ/ ℓ; 1 3 5 m in F a m il y : R a c h y c e n tr id a e ( C o b ia ) R a ch yc e n tr o n c a n a d u m L in n a e u s, 1 7 7 6 P ro d ig a l s o n 1 N o n e o b se rv e d 0 .2 5 0 m ℓ/ ℓ; 4 0 0 m in F a m il y : C ir rh it id a e ( H a w k fi s h e s ) C ir rh iti ch th ys o xy ce p h a lu s B le e ke r, 1 8 5 5 S p o tt e d h a w kf is h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : P o m a c e n tr id a e ( D a m s e lf is h e s ) A b u d e fd u f n o ta tu s D a y, 1 8 6 9 D u sk y d a m se l 5 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in A b u d e fd u f va ig ie n si s Q u o y & G a im a rd , 1 8 2 5 S e rg e a n t m a jo r 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : L a b ri d a e ( W ra s s e s ) B o d ia n u s b ilu n u la tu s L a ce p e d e , 1 8 0 1 S a d d le b a ck h o g fis h 9 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in B o d ia n u s d ia n a L a ce p e d e , 1 8 0 1 D ia n a ’s h o g fis h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in B o d ia n u s p e rd iti o Q u o y & G a im a rd , 1 8 3 4 G o ld sa d d le h o g fis h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C h e ili n u s tr ilo b a tu s L a ce p e d e , 1 8 0 1 T ri p le ta il w ra ss e 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C o ri s g a im a rd a fr ic a n a S m ith , 1 9 5 7 A fr ic a n c o ri s 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in H a lic h o e re s ir id is R a n d a ll & S m ith , 1 9 8 2 R a in b o w w ra ss e 3 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in H e m ig ym n u s fa sc ia tu s B lo ch , 1 7 9 2 B a rr e d t h ic kl ip 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in H o lo g ym n o su s d o lia tu s L a ce p e d e , 1 8 0 1 R in g e d w ra ss e 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : S c a ri d a e ( P a rr o tf is h e s ) S ca ru s g h o b b a n F o rs sk a l, 1 7 7 5 B lu e b a rr e d p a rr o tf is h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in S ca ru s ru b ro vi o la ce u s B le e ke r, 1 8 4 7 E m b e r p a rr o tf is h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in T A B L E 1 co n tin u e d 194 2-Phenoxyethanol as anaesthetic in relocating fi shes S c ie n ti fi c n a m e s E n g li s h n a m e s N u m b e rs E x c it a ti o n l e v e l A n a e s th e ti c l e v e l/ in d u c ti o n t im e F a m il y : M u g il id a e ( M u ll e ts ) M u g il ce p h a lu s L in n a e u s, 1 7 5 8 F la th e a d m u lle t 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : A c a n th u ri d a e ( S u rg e o n fi s h e s ) A ca n th u ru s tr io st e g u s L in n a e u s, 1 7 5 8 C o n vi ct s u rg e o n 9 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in A ca n th u ru s d u ss u m ie ri V a le n ci e n n e s, 1 8 3 5 P e n ci lle d s u rg e o n 6 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in A ca n th u ru s n ig ro fu sc u s F o rs sk a l, 1 7 7 5 B ro w n s u rg e o n 1 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in A ca n th u ru s te n n e n ti G u n th e r, 1 8 6 1 L ie u te n a n t su rg e o n 3 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in A ca n th u ru s th o m p so n i F o w le r, 1 9 2 3 C h o co la te s u rg e o n 4 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in A ca n th u ru s xa n th o p te ru s V a le n ci e n n e s, 1 8 3 5 Y e llo w fin s u rg e o n 6 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C te n o ch a e tu s st ri a tu s Q u o y & G a im a rd , 1 8 2 5 S tr ip e d b ri st le to o th 5 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in C te n o ch a e tu s st ri g o su s B e n n e tt , 1 8 2 8 S p o tt e d b ri st le to o th 6 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in N a so b re vi ro st ri s V a le n ci e n n e s, 1 8 3 5 S p o tt e d u n ic o rn 4 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in N a so li tu ra tu s S ch n e id e r, 1 8 0 1 O ra n g e -s p in e u n ic o rn 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in N a so u n ic o rn is F o rs sk a l, 1 7 7 5 B lu e sp in e u n ic o rn 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P a ra ca n th u ru s h e p a tu s L in n a e u s, 1 7 7 6 P a le tt e s u rg e o n 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in Z e b ra so m a s co p a s C u vi e r, 1 8 2 9 T w o to n e t a n g 2 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : S ig a n id a e ( R a b b it fi s h e s ) S ig a n u s su to r V a le n ci e n n e s, 1 8 3 5 W h ite sp o tt e d r a b b itf is h 3 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : S c o m b ri d a e ( T u n a s ) S a rd a o ri e n ta lis T e m m in ck & S ch le g e l, 1 8 4 4 S tr ip e d b o n ito 1 3 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in E u th yn n u s a ff in is C a n to r, 1 8 4 9 E a st e rn li tt le t u n a 2 4 0 .1 0 2 m ℓ/ ℓ; 2 1 0 m in 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in F a m il y : B a li s ti d a e ( T ri g g e rf is h e s ) B a lis to id e s co n sp ic ill u m B lo ch & S ch n e id e r, 1 8 0 1 C lo w n t ri g g e rf is h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in B a lis to id e s vi ri d e sc e n ce B lo ch & S ch n e id e r, 1 8 0 1 D o tt y tr ig g e rf is h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in P se u d o b a lis te s fu sc u s B lo ch & S ch n e id e r, 1 8 0 1 R ip p le d t ri g g e rf is h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in S u ff la m e n b u rs a B lo ch & S ch n e id e r, 1 8 0 1 B o o m e ra n g t ri g g e rf is h 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 3 3 0 m in T A B L E 1 co n tin u e d 195 D.B. VAUGHAN, M.R. PENNING & K.W. CHRISTISON T A B L E 2 F is h e s a n a e st h e tis e d a n d r e m o ve d f ro m t h e s h a rk t a n k a t S e a W o rl d S c ie n ti fi c n a m e E n g li s h n a m e N u m b e rs E x c it a ti o n l e v e l A n a e s th e ti c l e v e l/ in d u c ti o n t im e F a m il y : C a rc h a rh in id a e ( R e q u ie m s h a rk s ) C a rc h a rh in u s le u ca s V a le n ci e n n e s, 1 8 3 9 Z a m b e zi s h a rk 2 0 .1 0 0 m ℓ/ ℓ; 5 0 m in 0 .1 5 0 m ℓ/ ℓ; 7 0 m in F a m il y : O d o n ta s p id id a e ( R a g g e d -t o o th s h a rk s ) C a rc h a ri u s ta u ru s R a fin e sq u e , 1 8 1 0 S p o tt e d r a g g e d -t o o th 8 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 7 0 m in F a m il y : C a e s io n id a e ( F u s il ie rs ) C a e si o t e re s S e a le , 1 9 0 6 B e a u tif u l f u si lie r 2 0 .0 5 0 m ℓ/ ℓ; 3 0 m in 0 .0 5 0 m ℓ/ ℓ; 3 0 m in F a m il y : S p a ri d a e ( S e a b re a m s ) D ip lo d u s sa rg u s ca p e n si s S m ith , 1 8 4 4 B la ck t a il < 2 0 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 7 0 m in L ith o g n a th u s m o rm yr u s L in n a e u s, 1 7 5 8 S a n d s te e n b ra s < 1 5 0 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 7 0 m in R h a b d o sa rg u s th o rp e i S m ith , 1 9 7 9 B ig e ye s tu m p n o se 6 N o n e o b se rv e d 0 .1 0 0 m ℓ/ ℓ; 4 7 m in F a m il y : M o n o d a c ty li d a e ( M o o n ie s ) M o n o d a ct yl u s fa lc ifo rm is L a ce p e d e , 1 8 0 0 C a p e M o o n y < 1 5 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 7 0 m in F a m il y : C h a e to d o n ti d a e ( B u tt e rf ly fi s h e s ) C h a e to d o n b la ck b u rn ii D e sj a rd in s, 1 8 3 6 B ro w n b u rn ie 1 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 7 0 m in F a m il y : C a ra n g id a e ( K in g fi s h e s ) A le p e s d je d a b a F o rs sk a l, 1 7 7 5 S h ri m p s ca d < 2 0 0 0 .1 5 0 m ℓ/ ℓ; 7 0 m in 0 .1 5 0 m ℓ/ ℓ; 7 0 m in C a ra n g o id e s ca e ru le o p in n a tu s R u p p e ll, 1 8 3 0 C o a st a l k in g fis h < 2 0 0 .1 5 0 m ℓ/ ℓ; 7 0 m in 0 .1 5 0 m ℓ/ ℓ; 7 0 m in C a ra n x se xf a sc ia tu s Q u o y & G a im a rd , 1 8 2 5 B ig e ye k in g fis h < 1 0 0 .1 5 0 m ℓ/ ℓ; 7 0 m in 0 .1 5 0 m ℓ/ ℓ; 7 0 m in D e ca p te ru s m a cr o so m a B le e ke r, 1 8 5 1 S le n d e r sc a d < 1 0 0 0 .1 0 0 m ℓ/ ℓ; 3 0 m in 0 .1 5 0 m ℓ/ ℓ; 7 0 m in S e ri o la r iv o lia n a V a le n ci e n n e s, 1 8 3 3 L o n g fin y e llo w ta il 1 0 .1 5 0 m ℓ/ ℓ; 7 0 m in 0 .1 5 0 m ℓ/ ℓ; 7 0 m in T ra ch in o tu s a fr ic a n u s S m ith , 1 9 6 7 S o u th e rn p o m p a n o < 2 0 0 0 .1 0 0 m ℓ/ ℓ; 4 5 m in 0 .1 5 0 m ℓ/ ℓ; 7 0 m in T ra ch in o tu s b o tla S h a w , 1 8 0 3 L a rg e sp o tt e d p o m p a n o < 1 4 0 .1 5 0 m ℓ/ ℓ; 7 0 m in 0 .1 5 0 m ℓ/ ℓ; 7 0 m in F a m il y : E c h e n e id e a ( R e m o ra s ) R e m o ra r e m o ra L in n a e u s, 1 7 5 8 R e m o ra 6 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 7 0 m in F a m il y : P o m a c e n tr id a e ( D a m s e lf is h e s ) A b u d e fd u f va ig ie n si s Q u o y & G a im a rd , 1 8 2 5 S e rg e a n t m a jo r < 4 0 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 7 0 m in P le ct ro g ly p h id o d o n le u co zo n u s B le e ke r, 1 8 5 9 S a sh d a m se l < 1 0 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 7 0 m in T o ta l n u m b e rs g iv e n a s e st im a tio n s a re a p p ro xi m a te n u m b e rs o f in d iv id u a ls p e r sh o a l r e m o ve d 196 2-Phenoxyethanol as anaesthetic in relocating fi shes S c ie n ti fi c n a m e E n g li s h n a m e N u m b e rs E x c it a ti o n l e v e l A n a e s th e ti c l e v e l/ in d u c ti o n t im e F a m il y : L a b ri d a e ( W ra s s e s ) T h a la ss o m a h e b ra ic u m L a ce p e d e , 1 8 0 1 G o ld b a r w ra ss e < 1 0 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 7 0 m in T h a la ss o m a lu n a re L in n a e u s, 1 7 5 8 C re sc e n t- ta il w ra ss e < 1 0 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 7 0 m in F a m il y : M u g il id a e ( M u ll e ts ) L iz a r ic h a rd so n ii S m ith , 1 8 4 6 S o u th e rn m u lle t < 1 0 0 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 7 0 m in F a m il y : A c a n th u ri d a e ( S u rg e o n fi s h e s , U n ic o rn fi s h e s ) A ca n th u ru s tr io st e g u s L in n a e u s, 1 7 5 8 C o n vi ct s u rg e o n < 4 0 N o n e o b se rv e d 0 .1 5 0 m ℓ/ ℓ; 7 0 m in T o ta l n u m b e rs g iv e n a s e st im a tio n s a re a p p ro xi m a te n u m b e rs o f in d iv id u a ls p e r sh o a l r e m o ve d T A B L E 2 co n tin u e d 197 D.B. VAUGHAN, M.R. PENNING & K.W. CHRISTISON exhibit was the most sensitive of all fishes to 2-Phen- oxyethanol. Excitation was brief yet violent, followed by a sudden and complete loss of equilibrium at 0.048 mℓ/ℓ and 83.2 % dissolved oxygen after 75 min after the introduction of the initial increment, and was removed to the untreated transport tank where it made a full recovery. Beautiful fusilier, Caesio teres Seale, 1906 displayed a short period of excitation at 0.050 mℓ/ℓ before losing equilibrium at 81.6 % dis- solved oxygen and 30 min. Dusky batfish, Platax pin natus Linnaeus, 1758 became anaesthetised at 0.060 mℓ/ℓ and 78 % dissolved oxygen and 105 min without excitation. Largespotted pompano, Trachino- tus botla Shaw, 1803, from the open ocean exhibit became anaesthetised at 0.072 mℓ/ℓ and 71.9 % dis- solved oxygen and 135 min, and at 0.150 mℓ/ℓ in the shark tank at 72.9 % dissolved oxygen and 70 min. Bigeye stumpnose, Rhabdo sargus thorpei Smith, 1979, became anaesthetised at 0.100 mℓ/ℓ at 79.8 % dissolved oxygen and 47 min without displaying ex- citation. Excitation was evident in the Little Eastern tuna, Euthynnus affinis Cantor, 1849, at 0.102 mℓ/ℓ and 210 min, but they only became anaesthetised at 0.150 mℓ/ℓ at 71.9 % dissolved oxygen and 330 min. All other fishes except the Cobia, R. canadum, became anaesthetised at 0.150 mℓ/ℓ and 71.9 % dis- solved oxygen and 330 min without excitation, and were easily removed from the exhibits. The Cobia was the last fish to be removed from the open ocean exhibit after increasing the dosage to 0.250 mℓ/ℓ, at 89.6 % dissolved oxygen and 430 min. No mortalities resulted from the use of 2-Phenoxy- ethanol on any of the fishes during anaesthesia or transport to uShaka Marine World. DISCUSSION Hseu, Yeh, Chu & Ting (1998) outlined a drawback in the use of 2-Phenoxyethanol, in that it requires high anaesthetic concentrations in comparison to MS-222 (Argent Chemical Laboratories) and Quin- al dine (SIGMA-ALDRICH) in fishes, and that the effective concentration for most fishes is 0.200 mℓ/ℓ to 0.600 mℓ/ℓ. Recently, Velíšec, Wlasow, Gomulka, Svobodova & Novotny (2007) indicated that 2-Phen- oxyethanol also has a relatively low therapeutic in- dex, reported as 1:2.6. The majority of fishes anaesthetised throughout their translocation of fishes from Sea World to uShaka Marine World showed optimal anaesthesia at the concentration of 0.150 mℓ/ℓ, with some species effec tively anaesthetised at lower dosages, and one species (R. canadum) requiring additional anaes- thetic to facilitate successful removal. Yanar & Kum lu (2001) and Velíšec et al. (2007) indi- cated that the effective concentration of an anaes- thetic leading to induction in fishes varied according to their sex, age, water quality parameters, overall biomass and physiological state, and the duration of the exposure. All T. botla from the shark tank were juveniles of less than 20 cm in length. Those from the open ocean exhibit were adults of approximate- ly 50 cm in length. Velíšec & Svobodova (2004a) indicated that juvenile rainbow trout, Oncorhynchus mykiss Walbaum, 1792, are more sensitive to 2- Phen oxyethanol than adults. This could explain the difference in effective induction of T. botla from the shark tank and open ocean exhibit, where more than double the dosage of 2-Phenoxyethanol for the adult fish from the open ocean exhibit was required for the same anaesthetic effect. Once the desired level of anaesthesia had been reached in both exhibits, sev- eral hours passed before all fishes were eventually removed. Their anaesthetic state remained stable and did not progress with time. Velíšec & Svobodova (2004a); Velíšec et al. (2007) also consider that sensitivity to anaesthetics is influ- enced by the enhancement of decreasing or low dissolved oxygen concentration, but the most im- portant factor affecting the anaesthetic efficiency of 2-Phenoxyethnol is temperature, where higher tem- peratures produce better anaesthetic efficiency (Vel- í šec & Svobodova 2004b). Dissolved oxygen levels dropped slightly in each exhibit from the beginning of the exercise to first induction, but remained sta- ble at 71.9 % and 72.9 % for the open ocean exhibit and shark tank, respectively. This initial drop is thought to be the result of shutting down the filtra- tion processes and incoming make-up water just prior to the introduction of the first anaesthetic incre- ment. The last dissolved oxygen reading for the open ocean exhibit was taken at induction of the last remaining individual fish, R. canadum, and was no- tably higher at 89.6 % after the removal of all other fishes, which indicates that the stable dissolved oxy- gen levels observed reflect the equilibrium between biomass and maintained artificial aeration. Aeration is therefore recommended for similar future exer- cises. Yanar & Kumlu (2001) stated, following an experi- ment with European seabass, Dicentrarchus labrax Linnaeus, 1758, that an increase in anaesthetic con- centration decreased the induction time. This is evi- dent in comparing the time to induction at 0.150 mℓ/ℓ, 198 2-Phenoxyethanol as anaesthetic in relocating fi shes obtained at 330 min and 70 min for the open ocean exhibit and shark tank respectively, but excitation was displayed in all carangids in the shark tank but not in those from the open ocean exhibit. It is there- fore possible that time to anaesthetic concentration, and not necessarily the concentration alone could have played an important role in controlling the on- set of excitation in this family of fishes. Molinero & Gonzalez (1995) consider that reactions of fishes to 2-Phenoxyethanol and MS-222 include a change in respiratory rate and pigmentation. Tytler & Hawkins (1981) suggested that retaining fishes in an anaesthetic bath for too long leads to the fading of respiration and finally complete respiratory and cardiac failure, but Hajec, Kłyszejko & Dziaman (2006) confirmed that lower effective concentrations of the anaesthetic clove oil provided longer periods of general anaesthesia with respiration being main- tained. Although fishes in both exhibits became in- creasingly less responsive to external stimuli, such as sudden movements and the presence of divers in the water through the progression of concentra- tion increments and time, no obvious pigmentation changes or notable changes in respiration rates for the entire duration of the exercise were observed. Shoaling species such as Southern pompano, Tra- chi notus africanus Smith, 1967, Shrimp scad, Ale- pes djedaba Forsskal, 1775, and Coastal kingfish, Carangoides caeruleopinnatus Ruppell, 1830, as- sumed tight shoals until just prior to anaesthesia when they became disorientated, and dispersed throughout the water column before losing equilib- rium. No information is available in which the successful use of 2-Phenoxyethanol to anaesthetise adult C. leucas, and C. taurus, is outlined. Both these spe- cies reacted favourably to this anaesthetic, allowing safe anaesthesia without risk of injury to the sharks or handlers, at the concentration of 0.150 mℓ/ℓ and 72.9 % dissolved oxygen, and 70 min. The translocation of all fishes from one public aquar- ium to another is a rare occurrence, and one which requires careful planning. The use of 2-Phenoxy- ethanol as a reliable and stable anaesthetic was paramount to the successful and relatively stress- free procedure which included transportation by road. REFERENCES DEACON, N., WHITE, H., & HECHT, T. 1997. Isolation of the effective concentration of 2-Phenoxyethanol for anaesthesia in the spotted grunter (Pomadays commersonnii), and its ef- fect on growth. Aquarium Sciences and Conservation, 1: 19–27. DUNN, R.F. & KOESTER, D.M. 1985. Anesthetics in elasmo- branchs: A review with emphasis on halothane-oxygen-ni- trous oxide. Journal of Aquariculture and Aquatic Sciences, 5:44–52. 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