Use of eugenol for anesthesia of lesser guitarfish Zapteryx brevirostris (Rhinobatidae)

Uso de eugenol para anestesia de raia-viola Zapteryx brevirostris (Rhinobatidae)

V. Takatsuka D. G. C. Costa N. Y. Oliveira E. G. Sanches V. G. Azevedo About the authors

Abstract

Anesthesia can be utilized as a non-lethal procedure to allow easy handling of teleosts and elasmobranchs in captivity or in the wild. For this, anesthetic protocols need to be established according to the species. The aim of this study was to determine the ideal concentration of eugenol for anesthesia of Zapteryx brevirostris. Four concentrations were tested: 21.25, 42.50, 85.00 and 170.00 mg L-1 (ratio of 1:5 with absolute ethanol). The perfect concentration of eugenol for this species was 85.0 mg L-1 , which enabled up to 300 seconds of work on the fish, without any response to handling.

Keywords:
sedation; anesthetic; ray; elasmobranch

Resumo

A anestesia pode ser utilizada como um procedimento não letal que facilita o manejo de teleósteos e elasmobrânquios de cativeiro e de vida livre. Para isso, protocolos anestésicos devem ser estabelecidos de acordo com a espécie. O objetivo deste trabalho foi determinar a concentração ideal do eugenol para anestesiar Zapteryx brevirostris. Foram testadas as concentrações de 21,25; 42,50; 85,00 e 170,00 mg L-1 (1:5 de álcool absoluto). A concentração de 85,0 mg L-1 de eugenol foi a mais adequada para a espécie, permitindo uma janela de trabalho de até trezentos segundos com o animal não respondendo ao manejo.

Palavras-chave:
sedação; anestesia; raia; elasmobrânquio

1. Introduction

Handling of elasmobranchs in captivity or in the natural environment requires complicated logistics that impose major difficulty. Their behavior of resistance during capture and handling has an effect on their physiology. Therefore, it is important to immobilize these fish before handling, especially if it is desired to evaluate their physiology or avoid stress ( Souza et al., 2017 SOUZA, C.D., BALDISSERA, M.D., SALBEGO, J., LOPES, J.M., VAUCHER, R.D., MOURAO, R.H.V., CARON, B.O., HEINZMANN, B.M., SILVA, L.V.F. and BALDISSEROTTO, B., 2017. Physiological responses of Rhamdia quelen (Siluriformes: Heptapteridae) to anesthesia with essential oils from two different chemotypes of Lippia alba. Neotropical Ichthyology, vol. 15, no. 1, pp. e160083. http://dx.doi.org/10.1590/1982-0224-20160083.
http://dx.doi.org/10.1590/1982-0224-201...
). Anesthesia and sedation are valuable tools in relation to catching wild fish. In operations to colonize aquariums, it is not always necessary to anesthetize or sedate the fish. However, for some procedures, sedation is essential for minimizing the stress ( Weinert et al., 2015 WEINERT, N.C., VOLPATO, J., COSTA, A., ANTUNES, R.R., OLIVEIRA, A.C., MATTOSO, C.R.S. and SAITO, M.E., 2015. Hematology of Nile tilapia (Oreochromis niloticus ) subjected to anesthesia and anticoagulation protocols. Semina: Ciências Agrárias, vol. 36, no. 6, pp. 4237-4250. http://dx.doi.org/10.5433/1679-0359.2015v36n6Supl2p4237.
http://dx.doi.org/10.5433/1679-0359.201...
) or physical damage that is caused through capture, biometry ( Husen and Sharma, 2014 HUSEN, A. and SHARMA, S., 2014. Efficacy of anesthetics for reducing stress in fish during aquaculture practices - a review. Journal of Science, Engineering and Technology , vol. 10, no. 1, pp. 104-123. ) and transportation ( Simões et al., 2011 SIMÕES, L.N., LOMBARDI, D.C., GOMIDE, A.T.M. and GOMES, L.C., 2011. Efficacy of clove oil as anesthetic in handling and transportation of Nile tilapia, Oreochromis niloticus (Actinopterygii: Cichlidae) juveniles. Zoologia, vol. 28, no. 3, pp. 285-290. http://dx.doi.org/10.1590/S1984-46702011000300001.
http://dx.doi.org/10.1590/S1984-4670201...
; Rucinque et al., 2016 RUCINQUE, D.S., POLO, G., BORBÓN, J. and GONZÁLEZ MANTILLA, J.F., 2016. Anesthetic use of eugenol and benzocaine in juveniles of red tilapia (Oreochromis sp. ). Revista Colombiana de Ciencias Pecuarias, vol. 30, no. 1, pp. 60-66. http://dx.doi.org/10.17533/udea.rccp.v30n1a07.
http://dx.doi.org/10.17533/udea.rccp.v3...
). For research or veterinary procedures, anesthesia or sedation to keep the animal unconscious or to relieve pain may be necessary ( Ross and Ross, 2008 ROSS, L.G. and ROSS, B., 2008. Anaesthetic and sedative techniques for aquatic animals . 3rd ed. Oxford: Blackwell Publishing, 222 p. http://dx.doi.org/10.1002/9781444302264.
http://dx.doi.org/10.1002/9781444302264...
).

The process of anesthesia can be divided in four stages or levels: 1. light sedation; 2. deep sedation; 3. anesthesia ( Woody et al., 2002 WOODY, C.A., NELSON, J. and RAMSTAD, K., 2002. Clove oil as an anaesthetic for adult sockeye salmon: field trials. Journal of Fish Biology, vol. 60, no. 2, pp. 340-347. http://dx.doi.org/10.1111/j.1095-8649.2002.tb00284.x.
http://dx.doi.org/10.1111/j.1095-8649.2...
); and (added by some authors) 4. overdose or euthanasia ( Ross and Ross, 2008 ROSS, L.G. and ROSS, B., 2008. Anaesthetic and sedative techniques for aquatic animals . 3rd ed. Oxford: Blackwell Publishing, 222 p. http://dx.doi.org/10.1002/9781444302264.
http://dx.doi.org/10.1002/9781444302264...
). Each stage has been described in terms of the different behaviors observed, and it is therefore possible to monitor the evolution of anesthesia and know when to intervene to perform veterinary procedures.

Recent research on teleosts has tested natural anesthetics derived from plant oils ( Sanchez et al., 2014 SANCHEZ, M.S.S., RODRIGUES, R.A., NUNES, A.L., OLIVEIRA, A.M.S., FANTINI, L.E. and CAMPOS, C.M., 2014. Respostas fisiológicas de cacharas Pseudoplatystoma reticulatum submetidos a anestésicos naturais. Semina: Ciências Agrárias, vol. 35, no. 2, pp. 1061-1070. http://dx.doi.org/10.5433/1679-0359.2014v35n2p1061.
http://dx.doi.org/10.5433/1679-0359.201...
). Among these, clove oil is extracted from the flowers, stalks and leaves of Syzygium aromaticum (Eugenia aromaticum) or Eugenia caryophyllata . Use of clove oil as an anesthetic for teleosts is widespread and well-established ( Keene et al., 1998 KEENE, J.L., NOAKES, D.L.G., MOCCIA, R.D. and SOTO, C.G., 1998. The efficacy of clove oil as an anaesthetic for rainbow trout, Oncorhynchus mykiss (Walbaum). Aquaculture Research, vol. 29, no. 2, pp. 89-101. http://dx.doi.org/10.1111/j.1365-2109.1998.tb01113.x.
http://dx.doi.org/10.1111/j.1365-2109.1...
; Griffiths, 2000 GRIFFITHS, S.P., 2000. The use of clove oil as an anaesthetic and method for sampling intertidal rockpool fishes. Journal of Fish Biology, vol. 57, no. 6, pp. 1453-1464. http://dx.doi.org/10.1111/j.1095-8649.2000.tb02224.x.
http://dx.doi.org/10.1111/j.1095-8649.2...
; Delbon and Ranzani-Paiva, 2012 DELBON, M.C. and RANZANI-PAIVA, M.J.T., 2012. Eugenol in tilapia juvenile: concentrations and successive administrations. Boletim do Instituto de Pesca, vol. 38, no. 1, pp. 43-52. ; Pádua et al., 2013 PÁDUA, S.B., DIAS NETO, J., SAKABE, R., CLAUDIANO, G.S., CHAGAS, E.C. and PILARSKI, F., 2013. Variáveis hematológicas em tambaquis anestesiados com óleo de cravo e benzocaína. Pesquisa Agropecuária Brasileira , vol. 48, no. 8, pp. 1171-1174. http://dx.doi.org/10.1590/S0100-204X2013000800056.
http://dx.doi.org/10.1590/S0100-204X201...
; Shijie et al., 2016 SHIJIE, L., ADAMS, M.B.A., NOWAK, B.F.A. and CROSBIE, P.B.B., 2016. Effects of anaesthetics containing eugenol on Neoparamoeba perurans. Aquaculture , vol. 463, pp. 159-162. http://dx.doi.org/10.1016/j.aquaculture.2016.05.033.
http://dx.doi.org/10.1016/j.aquaculture...
; Fernandes et al., 2016 FERNANDES, I.M., BASTOS, Y.F., BARRETO, D.S., LOURENÇO, L.S. and PENHA, J.M., 2016. The efficacy of clove oil as an anaesthetic and in euthanasia procedure for small-sized tropical fishes. Brazilian Journal of Biology = Revista Brasileira de Biologia , vol. 77, no. 3, pp. 444-450. http://dx.doi.org/10.1590/1519-6984.15015. PMid:27683808.
http://dx.doi.org/10.1590/1519-6984.150...
; Pattanasiri et al., 2017 PATTANASIRI, T., TAPARHUDEE, W. and SUPPAKUL, P., 2017. Acute toxicity and anaesthetic effect of clove oil and eugenol on Siamese fighting fish, Betta splendens. Aquaculture International, vol. 25, no. 1, pp. 163-175. http://dx.doi.org/10.1007/s10499-016-0020-2.
http://dx.doi.org/10.1007/s10499-016-00...
). The drugs used for immersion anesthesia for elasmobranchs are the following: benzocaine, etomidate, metomidate, halothane-oxygen-nitrous oxide, oxygen, quinaldine and tricaine methane sulfonate (MS-222) ( Stamper, 2004 STAMPER, M.A., 2004. Immobilization on elasmobranchs. In: M. SMITH, D. WARMOLTS, D. THONEY and R. HUETER, eds. The elasmobranch husbandry manual: captive care of sharks, rays, and their relatives. 1st ed. Columbus: Biological Survey, pp. 301-323. ; Stamper, 2007 STAMPER, M.A., 2007. Elasmobranchs: sharks, rays, and skates. In: G. WEST, D.J. HEARD and N. CAULKETT, eds. Zoo animal and wildlife immobilization and anesthesia . Iowa: Blackwell Publishing, 649 p. ). However, this group includes carcinogenic substances, substances that irritate the fish mucosa, some that have a high commercial price and some that are prohibited in Brazil ( Roubach et al., 2001 ROUBACH, R., GOMES, L.C. and VAL, A.L., 2001. 2001 Safest level of tricaine methanesulfonate (MS-222) to induce anesthesia in juveniles of matrinxã, Brycon cephalus. Acta Amazonica, vol. 31, no. 1, pp. 159-163. http://dx.doi.org/10.1590/1809-43922001311163.
http://dx.doi.org/10.1590/1809-43922001...
).

In considering the use of natural anesthetics derived from plant oils for elasmobranchs, the use of the Eugenol, is an option. The objective of this work is to test the use of the Eugenol as anesthetics for elasmobranchs and to determine the ideal concentration for anesthesia of Zapteryx brevirostris.

2. Methods

For this experiment, 21 adult specimens of lesser guitarfish (11 male rays and 10 female rays) were used. Their mean weight was 541.16 ± 119.18 g and their mean total length was 44.47 ± 4.48 cm. The small number of specimens that were used in this experiment was related to the physical limitations of the laboratory and the size of these fish.

The fish were obtained through a trawl fishery focusing on shrimps in Ubatuba, SP, under authorization via SISBIO no. 49980-3 and from our institution’s biosafety and ethics committee (Comitê de Ética em Experimentação Animal do Instituto de Pesca, CEEAIP), no. 12/2016. After recovery of the trawl net, the rays were removed from the bagger and were placed together in a large Styrofoam box with continuous water flow until the time of landing, in front of the Marine Pisciculture Laboratory. There, the rays were acclimatized and maintained in three circular fiberglass tanks with a capacity of 3000 L, at a density of seven rays per tank (approximately 1 kg m-3) and at a temperature of 25 ± 2 °C and salinity of 30 ± 1.

Each tank had a sump filtration system of 100 L, with a skimmer and a bag of mesh size 100 microns. All the water in each tank was filtered every 45 minutes. Feed was offered once a day in the morning, consisting of Atlantic seabob shrimp (Xiphopenaeus kroyeri) without head and Frigate tuna (Auxis thazard) in cubes, at the amount of 1% of the biomass of the tank. Food leftovers and feces were siphoned out, 5 minutes after feeding started.

For anesthesia, four plastic boxes of capacity 100 L, containing 20 L of water for anesthetic dilution, were prepared. Eugenol (K-Dent) was previously diluted in 95% ethanol (ratio of 1:5). The concentrations of eugenol tested were 21.25, 42.50, 85.00 and 170.00 mg L-1 .

The rays were sorted and immersed individually in each concentration of anesthetic solution: 6 rays in 21.25 mg L-1, 5 in 42.50 mg L-1, 5 in 85.00 mg L-1 and 5 in 170.00 mg L-1. The chronometer was triggered to establish the time taken to induce anesthesia, which was counted from the time of transferring the ray to the tank containing eugenol, until anesthesia stage III was reached ( Table 1 ) ( Woody et al., 2002 WOODY, C.A., NELSON, J. and RAMSTAD, K., 2002. Clove oil as an anaesthetic for adult sockeye salmon: field trials. Journal of Fish Biology, vol. 60, no. 2, pp. 340-347. http://dx.doi.org/10.1111/j.1095-8649.2002.tb00284.x.
http://dx.doi.org/10.1111/j.1095-8649.2...
; Ross and Ross, 2008 ROSS, L.G. and ROSS, B., 2008. Anaesthetic and sedative techniques for aquatic animals . 3rd ed. Oxford: Blackwell Publishing, 222 p. http://dx.doi.org/10.1002/9781444302264.
http://dx.doi.org/10.1002/9781444302264...
). At this stage, the rays displayed tonic immobility, absence of tail and fin movements, absence of reaction to external touch and frequency of spiracle beats of less than 10 per minute.

Table 1
Description of stages of anesthesia for Zapteryx brevirostris using different concentrations of eugenol.

After reaching stage III, each ray was transferred to a 30 L plastic box containing seawater, and the anesthesia recovery period began. Biometry was performed while the ray was in this box and, afterwards, it was transferred to a box containing 100 L of water for final recovery monitoring. The anesthesia recovery time was monitored until the ray exhibited normal swimming movements and the frequency of the spiracle beats reached the same level as in the first measurement before induction of anesthesia. The sequence of behaviors exhibited comprised: immobile animal, slow swimming, contraction of the gills, normal swimming, excitation, tail-only movement and flushing redness. During the handling period, all the behaviors exhibited were recorded, and the rate of spiracle movement was measured every 60 seconds. It was established that the times taken for induction of and recovery from anesthesia should not be longer than 600 seconds, longer than recommended time for anesthesia of aquatic organisms, for which the induction time should be 180 seconds and recovery time 300 seconds ( Keene et al., 1998 KEENE, J.L., NOAKES, D.L.G., MOCCIA, R.D. and SOTO, C.G., 1998. The efficacy of clove oil as an anaesthetic for rainbow trout, Oncorhynchus mykiss (Walbaum). Aquaculture Research, vol. 29, no. 2, pp. 89-101. http://dx.doi.org/10.1111/j.1365-2109.1998.tb01113.x.
http://dx.doi.org/10.1111/j.1365-2109.1...
).

Based on our observation of the behaviors exhibited by the rays during the anesthesia baths, we suggest that for elasmobranchs some adaptations should be made to the tables that are used for evaluating anesthesia among teleosts. Because of differences in anatomy and ethology, we had to modify the descriptions of characteristics observed at each anesthetic stage.

The data were analyzed regarding normality of distribution using the Shapiro-Wilk test, and the Bartlett test was used for homogeneity of variance (homoscedasticity). The data were then subjected to the ANOVA test and, in situations of significant differences, the Tukey test was also used. The significance level was taken to be 5%. Regression analysis was performed between eugenol concentration, induction times and anesthesia recovery.

3. Results

Throughout the operation, the individual fish behavior was noted. Summaries of the anesthesia induction ethograms at each concentration of eugenol are presented in the following.

  1. a

    21.25 mg L-1

Marginal hyperemia of the pectoral and pelvic fins; increased beating of the spiracle; variation in motor activity with hyperexcitation phase; and contraction in the gill region, for expulsion of water through the spiracles. The rays did not reach stage III of anesthesia and remained conscious and agitated.

  1. b

    42.50 mg L-1

Marginal hyperemia of the pectoral and pelvic fins; increased beating of the spiracle; variation in motor activity with hyperexcitation phase; and contraction in the gill region, for expulsion of water through the spiracles. Reduction of motor activity, resulting in only quiet lateral movements of tail and dorsal fins; hyperemia of fins present. The rays reached stage III of anesthesia: they did not react to handling and remained totally relaxed during the biometry.

  1. c

    85.00 mg L-1

Increased beating of the spiracle; variation in motor activity with swimming phases; and contraction in the gill region, for expulsion of water through the spiracles; hyperemia of fins present. After 120 seconds, there was a drastic reduction of spiracle beats, such that there was minimal reaction to external stimuli of touch, and biometrics were performed at this time.

  1. d

    170.00 mg L-1

Excitement phase; drastic reduction of spiracle beats; hyperemia of fins present, but less intensely than at other concentrations. The rays reached stage III of anesthesia, and biometrics were performed at this time.

The results relating to induction and recovery times are listed in Table 2 .

Table 2
Induction and recovery times (s) to Zapteryx brevirostris in different eugenol concentration.

The template that was found for induction and recovery of rays anesthetized with eugenol followed the equations Ti = - 1.1810x + 1.9150 and Tr = 0.1943x + 0.1125, in which Ti is the time needed to reach stage III in seconds, and Tr is the time taken for recovery in seconds. For the induction equation, R2 was 0.7882 and for the recovery equation it was 0.4006.

After anesthesia recovery, the rays were monitored for 72 hours in a 3000 L glass fiber tank with oxygenation and constant filtration to follow up their return to appetite and any mortality. The first meal was offered 24 hours after recovery from anesthesia, and it was observed that the consumption was not different from the amount prior to the experiment (50 g). There was no mortality during or after the experiment.

4. Discussion

Use of low dosages of eugenol did not allow the ideal anesthetic plane for safe handling (stage III) to be reached. Instead of producing the desired effects, low dosages gave rise to exacerbated and uncoordinated behaviors among rays, along with increased beating of the spiracle. These features are characteristic of stage II of anesthesia ( Woody et al., 2002 WOODY, C.A., NELSON, J. and RAMSTAD, K., 2002. Clove oil as an anaesthetic for adult sockeye salmon: field trials. Journal of Fish Biology, vol. 60, no. 2, pp. 340-347. http://dx.doi.org/10.1111/j.1095-8649.2002.tb00284.x.
http://dx.doi.org/10.1111/j.1095-8649.2...
).

Fish should not be kept at this stage for a long time, because this is a stage of unnecessary suffering due to the hyperexcitation that it causes, which can result in vomiting, respiratory arrest and pupillary dilatation ( Ross and Ross, 2008 ROSS, L.G. and ROSS, B., 2008. Anaesthetic and sedative techniques for aquatic animals . 3rd ed. Oxford: Blackwell Publishing, 222 p. http://dx.doi.org/10.1002/9781444302264.
http://dx.doi.org/10.1002/9781444302264...
). One way to avoid these effects is to increase the dose of anesthetic, thus leading the fish to stage III. In teleosts, stage II of anesthesia through use of eugenol was also observed, in the concentration of 40 mg L-1 ( Delbon and Ranzani-Paiva, 2012 DELBON, M.C. and RANZANI-PAIVA, M.J.T., 2012. Eugenol in tilapia juvenile: concentrations and successive administrations. Boletim do Instituto de Pesca, vol. 38, no. 1, pp. 43-52. ).

By increasing the eugenol dose to 42.50 mg L-1, the rays also entered stage II, but after some minutes, stage III was reached. This resulted in a mean induction time of 434.4 s, which can be considered long. The ideal would be 180 to 300 seconds ( Keene et al., 1998 KEENE, J.L., NOAKES, D.L.G., MOCCIA, R.D. and SOTO, C.G., 1998. The efficacy of clove oil as an anaesthetic for rainbow trout, Oncorhynchus mykiss (Walbaum). Aquaculture Research, vol. 29, no. 2, pp. 89-101. http://dx.doi.org/10.1111/j.1365-2109.1998.tb01113.x.
http://dx.doi.org/10.1111/j.1365-2109.1...
).

The muscle contractions in the gill region that were exhibited at the two lowest concentrations used suggest that the conscious rays identified the drug. Moreover, in an attempt to expel this substance, they contract the musculature, thus resulting in squirting water out, which was detected as a slight movement on the surface of the water.

The two highest concentrations tested successfully induced stage III anesthesia in the rays. However, the concentration that induced anesthesia within the time closest to the ideal ( Keene et al., 1998 KEENE, J.L., NOAKES, D.L.G., MOCCIA, R.D. and SOTO, C.G., 1998. The efficacy of clove oil as an anaesthetic for rainbow trout, Oncorhynchus mykiss (Walbaum). Aquaculture Research, vol. 29, no. 2, pp. 89-101. http://dx.doi.org/10.1111/j.1365-2109.1998.tb01113.x.
http://dx.doi.org/10.1111/j.1365-2109.1...
) was 85.00 mg L-1. With this, stage II of anesthesia and its unwanted behaviors was avoided and the rays became anesthetized and ready for biometrics and routine management in 183.6 seconds. The safety of this concentration was confirmed through the recovery time, which was very close to the ideal for recovery from anesthesia and was an average of 254.4 seconds.

Using 170 mg L-1 the induction time was faster, with a mean of 74.4 seconds. A few more seconds of immersion in the anesthetic resulted in a longer recovery period. This demonstrates that the safety margin is low and therefore that in situations of anesthetization in which euthanasia is not the aim, concentrations as high as this are not recommended.

The window for doing work during management using the dose of 85 mg L-1 was 180 to 300 seconds. This was sufficient time for blood collection, inspection of ectoparasites and body lesions and complete biometry on the individual. Result like this were also found by Frick et al. (2009) FRICK, L.H., REINA, R.D. and WALKER, T.I., 2009. The physiological response of Port Jackson Sharks and Australian Swellsharks to sedation, gill-net capture, and repeated sampling in captivity. North American Journal of Fisheries Management, vol. 29, no. 1, pp. 127-139. http://dx.doi.org/10.1577/M08-031.1.
http://dx.doi.org/10.1577/M08-031.1 ...
using Port Jackson sharks and Australian swellsharks.

The adjusted regression curve for the anesthesia induction time showed that there was a linear reduction in induction time with increasing eugenol concentration ( Figure 1 ). In other words, the higher the concentration of eugenol used was, the shorter the anesthesia induction time also was. This behavior was also found among juveniles of Nile tilapia ( Oreochromis niloticus), and 40 mg L-1 gave rise to the longest induction time ( Delbon and Ranzani-Paiva, 2012 DELBON, M.C. and RANZANI-PAIVA, M.J.T., 2012. Eugenol in tilapia juvenile: concentrations and successive administrations. Boletim do Instituto de Pesca, vol. 38, no. 1, pp. 43-52. ).

Figure 1
Regression curve adjusted for the time of anesthetic induction in Lesser Guitarfish Zapteryx brevirostris, submitted to different concentrations of eugenol. Error bar represents the standard deviation.

The period monitored after recovery from anesthesia suggests that like in teleosts ( Delbon and Ranzani-Paiva, 2012 DELBON, M.C. and RANZANI-PAIVA, M.J.T., 2012. Eugenol in tilapia juvenile: concentrations and successive administrations. Boletim do Instituto de Pesca, vol. 38, no. 1, pp. 43-52. ), eugenol is a safe and quickly eliminated substance when used in elasmobranchs. Twenty-four hours after recovery from anesthesia, the rays were found to feed in a normal manner. Therefore, successive administration of eugenol in elasmobranchs should be investigated: this has already been proven to be possible in teleosts ( Woody et al., 2002 WOODY, C.A., NELSON, J. and RAMSTAD, K., 2002. Clove oil as an anaesthetic for adult sockeye salmon: field trials. Journal of Fish Biology, vol. 60, no. 2, pp. 340-347. http://dx.doi.org/10.1111/j.1095-8649.2002.tb00284.x.
http://dx.doi.org/10.1111/j.1095-8649.2...
; Delbon and Ranzani-Paiva, 2012 DELBON, M.C. and RANZANI-PAIVA, M.J.T., 2012. Eugenol in tilapia juvenile: concentrations and successive administrations. Boletim do Instituto de Pesca, vol. 38, no. 1, pp. 43-52. ; Guénette et al., 2007 GUÉNETTE, S.A., UHLAND, F.C., HÉLIE, P., BEAUDRY, F. and VACHON, P., 2007. Pharmacokinetics of eugenol in rainbow trout (Oncorhynchus mykiss). Aquaculture, vol. 266, no. 1-4, pp. 262-265. http://dx.doi.org/10.1016/j.aquaculture.2007.02.046.
http://dx.doi.org/10.1016/j.aquaculture...
). The present study reaffirms the safety of this drug, which is still very little used for management of marine elasmobranchs.

5. Conclusions

Eugenol can be safely used as an anesthetic substance for elasmobranchs. For routine procedures in which this anesthetic is used to reduce stress in these fish and to facilitate professional handling, the ideal is 85 mg L-1, because this presents an induction time of around 180 seconds and a recovery time of 240 seconds.

  • (With 1 figure)

References

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    » http://dx.doi.org/10.1590/1519-6984.15015
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    » http://dx.doi.org/10.1577/M08-031.1
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Publication Dates

  • Publication in this collection
    08 Oct 2018
  • Date of issue
    Jul-Sep 2019

History

  • Received
    18 Oct 2017
  • Accepted
    08 Feb 2018
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