Caught in the middle: bottom-up and top-down processes impacting recruitment in a small pelagic fish

Reviews in Fish Biology and Fisheries, Journal Year: 2022, Volume and Issue: unknown

Published: Dec. 4, 2022

Abstract Understanding the drivers behind fluctuations in fish populations remains a key objective fishery science. Our predictive capacity to explain these is still relatively low, due amalgam of interacting bottom-up and top-down factors, which vary across time space among within populations. Gaining mechanistic understanding recruitment requires holistic approach, combining field, experimental modelling efforts. Here, we use Western Baltic Spring-Spawning (WBSS) herring ( Clupea harengus ) exemplify power this approach high complexity (and their interactions). Since early 2000s, low levels have promoted intense research on stock. literature synthesis suggests that major are habitat compression spawning beds (due eutrophication coastal modification mainly) warming, indirectly leads changes phenology, prey abundance predation pressure. Other factors include increased intensity extreme climate events new predators system. Four main knowledge gaps were identified related life-cycle migration use, population structure demographics, life-stage specific impact multi-stressors, predator–prey interactions. Specific topics areas proposed, as well priority support sustainable management Given Sea severely impacted by altered precipitation, WBSS could be harbinger potential effects changing environmental small pelagic fishes other world. Graphical abstract

Language: Английский

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Impact of temperature on Downs herring (Clupea harengus) embryonic stages: First insights from an experimental approach

PLoS ONE, Journal Year: 2023, Volume and Issue: 18(4), P. e0284125 - e0284125

Published: April 7, 2023

Among all human-induced pressures, ocean warming is expected to be one of the major drivers change in marine ecosystems. Fish species are particularly vulnerable during embryogenesis. Here, impact temperature was assessed on embryonic stages Atlantic herring (Clupea harengus), a high socio-economic interest, with particular focus under-studied eastern English Channel winter-spawning component (Downs herring). Key traits linked growth and development were experimentally evaluated at three temperatures (8°C, 10°C 14°C), from fertilization hatching, standardized controlled conditions. Overall negative impacts increased observed rate, mean egg diameter eyed stage, hatching rate yolk sac volume. A faster developmental stage frequency newly hatched larvae also higher temperature. Potential parental effects detected for four key (i.e. survival rate), despite limited number families. For instance, large variability among families shown (between 0 63%). relationships between maternal characteristics embryo therefore explored. We show that substantial proportion variance 31 70%) could explained by female attributes considered. More particularly, age, life history asymptotic average length Brody coefficient), condition important predictors traits. Overall, this study constitutes stepping-stone investigate potential consequences Downs recruitment provides first insights effects.

Language: Английский

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Climate challenges for fish larvae: Interactive multi-stressor effects impair acclimation potential of Atlantic herring larvae

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 953, P. 175659 - 175659

Published: Aug. 23, 2024

Fish early life stages are particularly vulnerable and heavily affected by changing environmental factors. The interactive effects of multiple climate change-related stressors on fish larvae remain, however, largely underexplored. As rising temperatures can increase the abundance virulence bacteria, we investigated combination a spring heat wave bacterial exposure development Atlantic herring (Clupea harengus). Eggs Western Baltic Spring-spawners were reared at normal high temperature ramp exposed to Vibrio alginolyticus V. anguillarum, respectively. Subsequently, mRNA miRNA transcriptomes, microbiota composition, growth survival assessed. Both induced major downregulation gene expression likely impeding larval cell proliferation. In contrast, elevated resulted in minimal changes, indicating an impaired plastic response, which may cause cellular damage reducing later stages. alone or with notable shift leading down- but also upregulation predicted target genes. Moreover, both increased exposures significantly altered warming microbial richness diversity. outcomes this study highlight sensitivity towards stressors. Our results indicate that rapidly factors exceed stress threshold impairing essential acclimation responses, contribute ongoing recruitment decline Spring-Spawning herring.

Language: Английский

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A probabilistic foundation for the study of larval fish feeding, growth, and mortality rates

Canadian Journal of Fisheries and Aquatic Sciences, Journal Year: 2024, Volume and Issue: 81(7), P. 952 - 967

Published: April 29, 2024

Survival through the larval phase is predicated on probabilities of successful feeding, which dictates growth rates, and encountering predators. Here I perform a synthesis growth, mortality rates estimated during several studies from coastal Newfoundland, Canada, to provide description probability distribution that can serve as foundation expected vital rates. The standardized observations clearly follow skewed distributions, appropriately fit gamma distribution, with feeding demonstrating stronger degree skewness than either or possibly because each rate integrates prey–predator interactions over different time scales. Commonality in underlying form fish, along clear functional relationships between parameters, represents probabilistic basis expectations against prior new be contrasted. An example use such demonstrates they useful contextual information about contrast among our ability identify their relationship environmental drivers.

Language: Английский

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Embryonic and Pre‐Larval Developmental Patterns in Cryptocentroides arabicus (Teleostei, Gobiidae)

Anatomia Histologia Embryologia, Journal Year: 2024, Volume and Issue: 53(6)

Published: Nov. 1, 2024

ABSTRACT The Arabian goby, Cryptocentroides arabicus (Gobiidae: Gobiinae), is a significant species in marine and brackish water ecosystems. However, limited information available about the reproductive biology early life history of this species. This study aimed to understand embryonic pre‐larval development C . under controlled laboratory conditions using light microscopy. Ten fish pairs were placed five 70‐L glass aquaria, environmental parameters carefully monitored. After 4 months, spawning began, with each event yielding between 700 1500 eggs, totaling 10 events. elliptical‐shaped measuring 3.9 ± 0.1 mm length 1.6 maximum width, hatched after 7 days h at temperature 28°C. process resulted identification eight distinct larval developmental stages. Parental care by both male female was observed during incubation period. Documenting morphological changes contributes better understanding behaviour essential for conservation management environments.

Language: Английский

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