Stress induced by hooking, net towing, elevated sea water temperature and air in sablefish: lack of concordance between mortality and physiological measures of stress

Davis, Michael W.; Olla, Bori L.; Schreck, Carl B.

doi:10.1111/j.1095-8649.2001.tb00495.x

Cited by 88 publications

(66 citation statements)

References 26 publications

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“…Plasma lactate is an indirect outcome of this generation of muscle lactic acid, and several studies have found elevated lactate associated with delayed mortality following exercise or hypoxia (Wood et al, 1983;Ferguson and Tufts, 1992;van Raaij et al, 1996). However, this relationship is not found in all species (see Davis et al, 2001), nor do we have enough information to establish a threshold for plasma lactate (or other parameters) that would allow for a predictive index of determining when mortality would occur. Although fish in this study were not played to exhaustion and most fish experienced short landing and hook removal times, many fish experienced plasma lactate levels that were three times higher than levels for rapid capture fish, sufficiently high to suggest the possibility of delayed mortality.…”

Section: Recovery and Mortalitymentioning

confidence: 94%

Physiological response of wild rainbow trout to angling: impact of angling duration, fish size, body condition, and temperature

2005

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This study evaluated the immediate physiological response of wild rainbow trout to catch-and-release angling in the Alagnak River, southwest Alaska. Information was recorded on individual rainbow trout (n = 415) captured by angling including landing time and the time required to remove hooks (angling duration), the time to anesthetize fish in clove oil and withdraw blood, fish length and weight, and water temperature at capture locations. Plasma cortisol, glucose, ions (sodium, potassium, chloride), and lactate were analyzed to determine the effects of angling duration, fish size, body condition, and temperature. Levels of plasma ions did not change significantly during the observed physiological response and levels of plasma glucose were sometimes influenced by length (2000, 2001), body condition (2001), or temperature (2001). Levels of plasma cortisol and lactate in extended capture fish (angling duration greater than 2 min) were significantly higher than levels in rapid capture fish (angling duration less than 2 min). Rapid capture fish were significantly smaller than extended capture fish, reflecting that fish size influenced landing and handling times. Fish size was related to cortisol and lactate in 2002, which corresponded to the year when larger fish were captured and there were longer landing times. Body condition (i.e., weight/length regression residuals index), was significantly related to lactate in 2000 and 2001. Water temperatures were higher in 2001 (mean temperature ± S.E., 13 ± 2 • C) than in 2002 (10 ± 2 • C), and fish captured in 2001 had significantly higher cortisol and lactate concentrations than fish captured in 2002. The pattern of increase in plasma cortisol and lactate was due to the amount of time fish were angled, and the upper limit of the response was due to water temperature. The results of this study indicate the importance of minimizing the duration of angling in order to reduce the sublethal physiological disturbances in wild fish subjected to catch-and-release angling, particularly during warmer water temperatures. It is also important to note that factors such as fish size may influence both the duration of angling and subsequent physiological response.

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Section: Recovery and Mortalitymentioning

confidence: 94%

Physiological response of wild rainbow trout to angling: impact of angling duration, fish size, body condition, and temperature

2005

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“…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. Control fish were sampled for blood at the end of the 21-d observation period (Table 2).…”

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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“…Initial inspection of these data suggested that surface temperature effects were more evident in smaller fish; therefore, logistic regressions were conducted separately for small (<55 cm FL), medium (55-65 cm FL) and large (>65 cm FL) size classes within each depth zone. These categories correspond with the size groups tested by Davis et al (2001) for the rate of body core temperature increase after transfer to warmer water. Regressions for comparisons of recapture probability by surface temperature were calculated with this equation:…”

Section: Discussionmentioning

confidence: 99%

“…Although sablefish lack swimbladders and do not suffer barotrauma, they are susceptible to the rapid temperature increases associated with capture in cold, deep water and retrieval to warm surface waters. Mortality rates in experiments simulating capture at 4-6°C and discarding at surface temperatures of 12-20°C indicate that discarded fish may fare poorly during periods of elevated surface temperatures (Olla et al, 1998;Davis et al, 2001). The additional stress imposed on fish caught in deeper waters may also increase discard mortality rates.…”

Section: Management Impactsmentioning

confidence: 99%

Patterns of movement, growth, and survival of adult sablefish (Anoplopoma fimbria) at contrasting depths in slope waters off Oregon

Sogard¹,

Berkeley²

2017

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Abstract-Demersal fish inhabiting continental slopes experience colder temperatures, increasing hydrostatic pressure, decreasing oxygen saturation, and decreasing productivity with increased depth. We examined depth-related patterns in smalland large-scale movement, growth, and relative survival of sablefish (Anoplopoma fimbria) tagged during 1996-2004 in Oregon waters at depths of 141-1225 m; 2614 of 17,400 fish were recaptured as of December 2016. Recapture rates indicated significant size-dependent mortality. Discard mortality was affected by surface temperature for small fish (<55 cm in fork length [FL]) from upper slope depths (<400 m). Depth effects on recapture rates reflected differences in fishing effort. Most recaptures were near the initial capture depth. Although 91% of the recaptures were within 200 km of the tagging location, some individuals migrated thousands of kilometers, reaching the western Aleutian Islands. Growth rates were faster for females than for males and decreased with depth. Sablefish in the deepest depths sampled had extremely slow growth rates (<2 cm FL/year), low dispersal (2.4%), and were largely female (81%). Prior studies of age distribution indicate that deep slope habitats also support greater longevity, potentially providing a refuge for older fish and a buffering effect to longevity overfishing, depending on spatial differences in exploitation rates.

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Stress induced by hooking, net towing, elevated sea water temperature and air in sablefish: lack of concordance between mortality and physiological measures of stress

Cited by 88 publications

References 26 publications

Physiological response of wild rainbow trout to angling: impact of angling duration, fish size, body condition, and temperature

Physiological response of wild rainbow trout to angling: impact of angling duration, fish size, body condition, and temperature

Factors Affecting Catch‐and‐Release Mortality of Bluefish

Patterns of movement, growth, and survival of adult sablefish (Anoplopoma fimbria) at contrasting depths in slope waters off Oregon

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