Effects of suspended sediment on cortisol levels in wild and cultured strains of ayu Plecoglossus altivelis

Awata, Satoshi; Tsuruta, Tetsuya; Yada, Takashi; Iguchi, Kei’ichiro

doi:10.1016/j.aquaculture.2011.01.024

Cited by 36 publications

(13 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been reported that immunocompetence in ayu is affected by stressors such as shallow water and temperature change (Valle and Taniguchi, 1995), suspended sediment (Awata et al, 2011), and overcrowding (Iguchi et al, 2002(Iguchi et al, , 2003. On the other hand, Nagai et al (2004) have reported that domesticated ayu stock are more susceptible to F. psychrophilum than amphidromous or landlocked stock.…”

Section: Discussionmentioning

confidence: 99%

Infection Status of Ayu and Other Wild Fish with Flavobacterium psychrophilum and Edwardsiella ictaluri in the Tama River, Japan

et al. 2016

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Infection Status of Ayu and Other Wild Fish with Flavobacterium psychrophilum and Edwardsiella ictaluri in the Tama River, Japan

et al. 2016

View full text Add to dashboard Cite

“…Structural changes in gills elevate haematocrit, plasma cortisol and glucose levels, all of which are consistent with oxygen deprivation (Awata, Tsuruta, Yada, & Iguchi, ; Collin & Hart, ; Wilber & Clarke, ). Increased sedimentation and suspended sediment can also reduce the amount of dissolved oxygen in water, exacerbating the direct physical damage to gills (Henley, Patterson, Neves, & Lemly, ).…”

Section: Meta‐analysis and Reviewmentioning

confidence: 99%

A critical analysis of the direct effects of dredging on fish

et al. 2017

View full text Add to dashboard Cite

Dredging can have significant impacts on aquatic environments, but the direct effects on fish have not been critically evaluated. Here, a meta-analysis following a conservative approach is used to understand how dredging-related stressors, including suspended sediment, contaminated sediment, hydraulic entrainment and underwater noise, directly influence the effect size and the response elicited in fish across all aquatic ecosystems and all life-history stages. This is followed by an in-depth review summarizing the effects of each dredging-related stressor on fish. Across all dredging-related stressors, studies that reported fish mortality had significantly higher effect sizes than those that describe physiological responses, although indicators of dredge impacts should endeavour to detect effects before excessive mortality occurs. Studies examining the effects of contaminated sediment also had significantly higher effect sizes than studies on clean sediment alone or noise, suggesting additive or synergistic impacts from dredging-related stressors. The early life stages such as eggs and larvae were most likely to suffer lethal impacts, while behavioural effects were more likely to occur in adult catadromous fishes. Both suspended sediment concentration and duration of exposure greatly influenced the type of fish response observed, with both higher concentrations and longer exposure durations associated with fish mortality. The review highlights the need for in situ studies on the effects of dredging on fish which consider the interactive effects of multiple dredging-related stressors and their impact on sensitive species of ecological and fisheries value. This information will improve the management of dredging projects and ultimately minimize their impacts on fish. K E Y W O R D Scontaminated sediment, dredging impacts, fisheries, meta-analysis, noise pollution, suspended sediment

show abstract

“…Much of what is known about the 42 timing and rate of the post-stressor increase in HPA axis activity, including CORT secretion, is 43 derived from studies on captive bred rodents (Dallman and Bhatnagar, 2001). However, the HPA 44 axes of captive-bred animals often respond more slowly and reach lower peak activity in 45 comparison to their free-living counterparts (Awata et al, 2011;Douxfils et al, 2011;Ericsson et 46 activity, but the degree of modulation may be constrained by the broader phenotype (i.e., 93 endocrine flexibility/reaction norms; Hau and Goyman, 2015; Taff and Vitousek, 2016). 94 Whether individual differences in HPA axis activity during a sever stressor reflect similar 95 differences in normal CORT regulation at baseline levels is still unclear.…”

Section: Introduction 27mentioning

confidence: 99%

Stress-responsiveness influences baseline glucocorticoid levels: Revisiting the under 3 min sampling rule

Small

Bebus

Bridge

et al. 2017

General and Comparative Endocrinology

View full text Add to dashboard Cite

Plasma glucocorticoid (CORT) levels collected within 3min of capture are commonly believed to reflect pre-stressor, baseline CORT levels. Differences in these "baseline" values are often interpreted as reflecting differences in health, or the amount of social and environmental stress recently experienced by an individual. When interpreting "baseline" values it is generally assumed that any effect of capture-and-handling during the initial sampling period is small enough and consistent enough among individuals to not obscure pre-capture differences in CORT levels. However, plasma CORT increases in less than 3min post-capture in many free-living, endothermic species in which timing has been assessed. In addition, the rate of CORT secretion and the maximum level attained (i.e., the degree of stress-responsiveness) during a severe stressor often differs among individuals of the same species. In Florida scrub-jays (Aphelocoma coerulescens), an individual's stress-responsiveness during a 30min post-capture stressor is correlated with CORT levels in samples collected within 1.5min of capture, suggesting there is an intrinsic connection between stress-responsiveness and pre-capture CORT levels. Although differences in stress-responsiveness accounted for just 11% of the variance in these samples, on average, higher stress-responsive jays (top third of individuals) had baseline values twice that of lower stress-responsive jays (bottom third). Further, plasma CORT levels begin to increase around 2min post-capture in this species, but the rate of increase between 2 and 3min differs markedly with CORT increasing more rapidly in jays with higher stress-responsiveness. Together, these data indicate that baseline CORT values can be influenced by an individual's stress response phenotype and the differences due to stress-responsiveness can be exaggerated during sample collection. In some cases, the effects of differences in stress-responsiveness and the increase in CORT during sample collection could obscure, or supersede, differences in pre-capture plasma CORT levels that are caused by extrinsic factors.

show abstract

Effects of suspended sediment on cortisol levels in wild and cultured strains of ayu Plecoglossus altivelis

Cited by 36 publications

References 50 publications

Infection Status of Ayu and Other Wild Fish with <i>Flavobacterium psychrophilum</i> and <i>Edwardsiella ictaluri</i> in the Tama River, Japan

Infection Status of Ayu and Other Wild Fish with <i>Flavobacterium psychrophilum</i> and <i>Edwardsiella ictaluri</i> in the Tama River, Japan

A critical analysis of the direct effects of dredging on fish

Stress-responsiveness influences baseline glucocorticoid levels: Revisiting the under 3 min sampling rule

Contact Info

Product

Resources

About