Predicting Postrelease Survival in Large Pelagic Fish

Moyes, Christopher D.; Fragoso, Nuno; Musyl, Michael K.; Brill, Richard W.

doi:10.1577/t05-224.1

Cited by 165 publications

(185 citation statements)

References 22 publications

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“…In addition to observations on mortality, we obtained a physiological profile by examining blood constituents associated with stress, including lactate, glucose, several electrolytes, various proteins, and cortisol (Houston 1990). For some species, physiological measures may be good indicators of potential mortality (e.g., Olla et al 1998;Moyes et al 2006). Because we could not collect blood from bluefish without prolonged periods of handling (and therefore possibly contributing to additional stress), we followed the approach of Davis et al (2001) and sacrificed a proportion of the fish from each treatment (10 fish from the hooking treatment and 9 fish from the transfer treatment) to permit collection of individual blood samples.…”

Section: Methodsmentioning

confidence: 99%

Factors Affecting Catch‐and‐Release Mortality of Bluefish

Fabrizio¹,

Scharf

Shepherd

et al. 2008

N American J Fish Manag

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Abstract.-Recreational harvests of bluefish Pomatomus saltatrix along the U.S. coast from Maine to Florida exceed commercial harvests, and in recent years about 60-70% of angler-captured fish are released alive. The proportion of fish that survive hooking, handling, and release back to the ocean is unknown; however, if catch-and-release mortality is high, it may represent a significant component of the overall bluefish mortality rate. We estimated long-term (21-d) hooking mortality rates of field-captured bluefish and investigated the effects of various factors on postrelease mortality. Age, length, and the occurrence of bleeding were significant factors associated with catch-and-release mortality, which we estimated to be 38.8%. About 65% of the mortality was initial mortality, and the remainder was delayed mortality. We also performed a laboratory study to examine the physiological response of bluefish to two independent processes (hooking and release versus transfer in coolers to the laboratory) relevant to the field study. Laboratory-held fish that were hooked and released exhibited elevated concentrations of potassium in their blood, suggesting that they experienced either an osmotic imbalance or cellular damage. Laboratory-held fish exposed to the transfer treatment only exhibited osmotic imbalance (elevated plasma sodium concentration) and evidence of anaerobic metabolism (elevated plasma lactate concentration). Our findings indicate that bluefish age and size contribute to variable levels of metabolic stress and that delayed postrelease mortality is considerable.

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Section: Methodsmentioning

confidence: 99%

Factors Affecting Catch‐and‐Release Mortality of Bluefish

Fabrizio¹,

Scharf

Shepherd

et al. 2008

N American J Fish Manag

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“…Also in the NW Atlantic, Diaz and Serafy (2005) analysed factors that could affect the numbers of blue sharks in good enough condition for live release, using data from the U.S. Atlantic pelagic fishery observer program. In the Pacific Ocean, Moyes et al (2006) predicted post-release survival of blue sharks, Musyl et al (2011) analysed the post-release survival of five pelagic elasmobranch species, and Walsh et al (2009) analysed mortality of several shark species for the Hawaii-based longline fishery, including deep and shallow water sets.…”

Section: Introductionmentioning

confidence: 99%

An overview of the hooking mortality of elasmobranchs caught in a swordfish pelagic longline fishery in the Atlantic Ocean

Coelho

Fernandez‐Carvalho

Lino

et al. 2012

Aquat. Living Resour.

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-Hooking (or "at-haulback") fishing mortality was analysed in elasmobranchs captured by Portuguese longliners targeting swordfish in the Atlantic Ocean. Information was collected by on-board fishery observers who monitored 834 longline fishing sets between August 2008 and December 2011, and recorded information on 36 067 elasmobranch specimens from 21 different taxa. The hooking mortality proportions were species-specific, with some species having relatively high percentages of live specimens at time of haulback (e.g., blue shark, crocodile shark, pelagic stingray, manta, devil and eagle rays), while others had higher percentages of dead specimens (e.g., smooth hammerhead, silky shark, bigeye thresher). For the most captured species (Prionace glauca, Pseudocarcharias kamoharai, Isurus oxyrinchus and Alopias superciliosus), logistic generalized linear models (GLMs) were carried out to compare the mortality rates between sexes, specimen sizes and the regions of operation of the fleet. The sex-specific proportions of hooking mortality were significantly different for blue and crocodile sharks, with the males of both species having higher proportions of hooking mortality than the females. Specimen size was significant for predicting the hooking mortality for blue and shortfin mako sharks: in both cases, the larger specimens had lower odds of dying due to the fishing process. There were differences in the hooking mortality depending on the region of operation of the fleet, but those differences were also species-specific. For blue and crocodile sharks, the hooking mortality was higher in the Equatorial and southern Atlantic areas (when compared to the NE Atlantic region), while the opposite was observed for the shortfin mako, with lower mortality rates in the NE tropical area compared with the other regions. The results presented in this paper can be integrated into future ecological risk assessment analysis for pelagic elasmobranchs. Furthermore, the new information can be used to evaluate the impact of recent recommendations prohibiting the retention of some vulnerable elasmobranch species.

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“…Previous studies have reported both whole-blood and plasma lactate concentrations .23.3 mmol L À1 (the upper limit for the Lactate Pro) in several species of sharks, including Isurus oxyrinchus and Alopias vulpinus (Hight et al 2007), Prionace glauca (Moyes et al 2006), Rhizoprionodon terraenovae (Hoffmayer and Parsons 2001), Carcharhinus obscurus (Cliff and Thurman 1984;Mandelman and Skomal 2009) and C. plumbeus (Brill et al 2008). In the present study, diluting the whole-blood by 50%, whether using acidified saline, tap water or distilled water, provided a simple and reliable method for measurement of potentially off-scale lactate concentrations.…”

Section: Lactate Concentrations Outside the Meter Rangementioning

confidence: 99%

“…Changes in blood chemistry related to capture events provide information about the degree of capture stress in elasmobranchs, with strong evidence that the level of physiological disturbance manifested in the blood of sharks correlates with a wide range of stressors (Cliff and Thurman 1984;Moyes et al 2006;Mandelman and Skomal 2009).…”

Section: Introductionmentioning

confidence: 99%

Evaluation and use of a portable field kit for measuring whole-blood lactate in sharks

Awruch¹,

Simpfendorfer²,

Pankhurst³

2011

Mar. Freshwater Res.

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Abstract. Measurement of lactate is becoming a common procedure in assessing the physiological effects of capture stress in sharks, although the necessity to measure the concentrations in the laboratory limits the ability for field assessments. Portable lactate analysers offer an alternative, but await validation against laboratory assays for sharks. The present study assessed the reliability of a portable Lactate Pro analyser for measuring whole-blood lactate in the school shark, Galeorhinus galeus, in the field. Laboratory determination of whole-blood and plasma lactate obtained by spectrophotometry was highly correlated with field determinations. Because shark lactate concentration can exceed the upper detection limit of the portable analysers, which were designed for mammalian use, a method for dealing with values greater than the maximum detection limit was evaluated. Whole-blood diluted by 50% with acidified saline solution, tap water and distilled water gave measured values of 55, 56 and 52%, respectively, of the original values, allowing accurate estimation of concentrations exceeding the upper detection limit of the analyser. These findings indicated that the Lactate Pro can be used to rapidly and reliably measure lactate for sharks in the field.

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Predicting Postrelease Survival in Large Pelagic Fish

Cited by 165 publications

References 22 publications

Factors Affecting Catch‐and‐Release Mortality of Bluefish

Factors Affecting Catch‐and‐Release Mortality of Bluefish

An overview of the hooking mortality of elasmobranchs caught in a swordfish pelagic longline fishery in the Atlantic Ocean

Evaluation and use of a portable field kit for measuring whole-blood lactate in sharks

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