Plasma Cortisol Level for Stress Measurement of Japanese Whiting Sillago japonica Captured by Sweeping Trammel Net.

Tsunoda, Atsuhiro; Purbayanto, Ari; Akiyama, Seiji; Arimoto, Takafumi

doi:10.2331/suisan.65.457

Cited by 5 publications

(7 citation statements)

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“…A number of researchers have described fish mortality rates after encounters with fishing gear 3,14 , 18 . It has also been pointed out that injuries to fish skin, loss of scales, and the force required to pass through the net mesh affect the escapees’ mortality rate 4,19 , 20 .…”

Section: Discussionmentioning

confidence: 99%

“…A number of researchers have described fish mortality rates after encounters with fishing gear. 3,14,18 It has also been pointed out that injuries to fish skin, loss of scales, and the force required to pass through the net mesh affect the escapees' mortality rate. 4,19,20 From the viewpoints described in those studies and in the current study, it is sug- 5 Relationships of blood P O 2 between dying, surviving and control groups at prebinding; immediately after the end of binding (post-binding); 1-2 h prior to death (PD) or 4 h after release from binding; and just before death (D) or 6 h after release from binding.…”

Section: Discussionmentioning

confidence: 99%

“…[6][7][8] The effect on fish of being captured by or escaping from hooks or gill nets has been studied by hematological analysis. [9][10][11][12][13][14][15] However, it is diffi-cult to withdraw blood from fish without handling them, especially if they are entangled in a gill net.…”

Section: Introductionmentioning

confidence: 99%

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Blood parameters and electrocardiogram in squeezed fish simulating the effect of net damage and recovery

2004

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In the present study, rubber bands were tied around the girth of rainbow trout Oncorhynchus mykiss to simulate and assess the physiological damage and survival rates of fish that encounter gill nets. Physiological condition was assessed by analysis of blood lactate, pH, oxygen partial pressure and plasma potassium concentration before and after release from binding. Twentyfour hours after release, half of the test fish had died. Although the binding forces used to hamper fish did not differ significantly, blood lactate levels in the dead fish rose to 10-fold higher than those in the survivors. Consequently, the pH level fell in the group that died, whereas in the surviving group it fell only slightly and soon recovered. Potassium concentration increased after release from binding in fish that died, and the P O 2 levels in these fish continued to drop until just before death. It was concluded that when fish get entangled in fishing nets, blood lactate accumulates because of physical fatigue and the elevated lactate levels lead to metabolic acidosis. Finally, fatal metabolic conditions could cause higher mortality rates, even in escapees.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Blood parameters and electrocardiogram in squeezed fish simulating the effect of net damage and recovery

2004

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“…Further complicating this picture are adaptive mechanisms that may compensate to varying degrees for chronic or low-level stress and thereby contribute to inconsistency in stress responses among test subjects. A second challenge is that, analogous to the "observer effect" described in quantum physics, efforts to measure in vivo stress responses can be stressful in and of themselves; for example, the capture process can affect levels of measured cortisol levels in wild fi sh collected for stress management research (Cleary et al 2002;Tsunoda et al 1999). A third challenge for scientists is that the effects of the stress response can be diffi cult to distinguish from effects of the stressor itself (Selye 1955); this represents an important obstacle in endocrine disruption research, in which it is necessary to differentiate the particular effects of hormonally active substances from their concomitant ability to contribute to the stress response (Norris 2000).…”

Section: Measurement Of Stress Responsesmentioning

confidence: 99%

Morphologic Effects of the Stress Response in Fish

Harper

Wolf²

2009

ILAR Journal

174

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Fish and other aquatic animals are subject to a broad variety of stressors because their homeostatic mechanisms are highly dependent on prevailing conditions in their immediate surroundings. Yet few studies have addressed stress as a potential confounding factor for bioassays that use fish as test subjects. Common stressors encountered by captive fish include physical and mental trauma associated with capture, transport, handling, and crowding; malnutrition; variations in water temperature, oxygen, and salinity; and peripheral effects of contaminant exposure or infectious disease. Some stress responses are detectable through gross or microscopic examination of various organs or tissues; as reported in the literature, stress responses are most consistently observed in the gills, liver, skin, and components of the urogenital tract. In addition to presenting examples of various stressors and corresponding morphologic effects, this review highlights certain challenges of evaluating stress in fish: (1) stress is an amorphous term that does not have a consistently applied definition; (2) procedures used to determine or measure stress can be inherently stressful; (3) interactions between stressors and stress responses are highly complex; and (4) morphologically, stress responses are often difficult to distinguish from tissue damage or compensatory adaptations induced specifically by the stressor. Further investigations are necessary to more precisely define the role of stress in the interpretation of fish research results.

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“…The observation result on the dead Japanese whiting indicated that the gilled and entangled fish suffered heavily from injuries and damage to their bodies compared to the snagged and pocketed fish as shown in Table 3. The gilled and entangled fish exhibited scar injuries around their gill cover and scale losses in the majority of bodies due to the tight contact with the net twine as a result of violent struggling during the fish retained in the net 30 . In addition, the hauling process that may increase the net tension can be considered as the other factor to attribute to the body injury or damage.…”

Section: Discussionmentioning

confidence: 99%

Survival of Japanese whiting Sillago japonica and by-catch species captured by a sweeping trammel net

et al. 2001

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SUMMARY: The survival of Japanese whiting Sillago japonica and by‐catch species captured by a sweeping trammel net was examined to assess the effects of differing species, captured conditions, and body lengths on survival, in Tateyama Bay, Chiba Prefecture, Japan. All the live samples were kept in laboratory tanks for 4 days of successive survival observation. The survival ratio of the Japanese whiting varied by the captured conditions. The fish captured by pocketed condition was 27% surviving at the fourth day, which was significantly higher than the gilled and entangled fish. Most of the by‐catch species survived for 4 days. About 60% of dead Japanese whiting were observed to have scar injury and damage on the body surface. For the by‐catch species, the body damage occurred only in stripedfin goatfish Upeneus bensasi, Temminck's surfperch Ditrema temmincki, and tidepool gunnel Pholis nebulosa. Therefore, it suggests that the conservation measure through catch‐and‐release may be an appropriate method for most by‐catch species, but not for the Japanese whiting.

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Plasma Cortisol Level for Stress Measurement of Japanese Whiting Sillago japonica Captured by Sweeping Trammel Net.

Cited by 5 publications

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Blood parameters and electrocardiogram in squeezed fish simulating the effect of net damage and recovery

Blood parameters and electrocardiogram in squeezed fish simulating the effect of net damage and recovery

Morphologic Effects of the Stress Response in Fish

Survival of Japanese whiting Sillago japonica and by-catch species captured by a sweeping trammel net

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