Geographic variation in demography of black perch (Embiotoca jacksoni): Effects of density, food availability, predation, and fishing

Johnson, Donald B.; Stirling, Brian S.; Paz, Janelle; Satterfield, Darien R.

doi:10.1016/j.jembe.2019.04.008

Cited by 5 publications

(1 citation statement)

References 53 publications

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“…Life-history characteristics of fish can vary substantially over their geographic range. Among fishes inhabiting temperate regions geographic variation in fecundity, size, growth, timing of maturation or sex change, age and survival have been linked with variation in temperature (Trip et al, 2014;Visconti et al, 2020), food availability (Johnson et al, 2019), conspecific density (Caselle et al, 2011) and fishing pressure (Hamilton et al, 2007). Given the possibility of the interactive influences of environmental variation, evolutionary history and human exploitation, it can be difficult to disentangle the relative importance of these different sources of geographic variation in life history and thereby predicting the possible implications of climate changes (Pironon et al, 2017).…”

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Geographical variation in age and growth of the endemic Australian sciaenid Atractoscion atelodus

Hegarty

Stewart

Gladstone

2021

Journal of Fish Biology

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Growth rates and other age-related population characteristics are essential parameters underpinning management of a stock. This is the first study to estimate lengthat-age of Atractoscion atelodus (family Sciaenidae) in New South Wales (NSW), despite the species being exploited since the 1940s. The aim of the current study was to quantify the age-based biological characteristics of A. atelodus and in particular: (a) validate the use of sagittal otoliths to quantify age; (b) estimate the growth rates and longevity of males and females; (c) examine geographical variation in age and growth; (d) document the age composition in commercial landings and(e) estimate mortality rates. A. atelodus is relatively fast growing, reaching 40 cm fork length (L F ) in the first year of life and living to at least 14 years. Growth was significantly different between sexes, with modelled asymptotic lengths of females (L ∞ = 84.6 cm L F ) greater than males (L ∞ = 69.0 cm L F ). Growth rates were also significantly different between northern and southern populations. Fish sampled from the southern region were younger and faster growing than those sampled in the northern region, supporting the counter-gradient growth theory and the influence of upwelling providing greater nutrient and food availability. The commercial fishery was predominantly based on young fish <3 years. with few (c. 5%) greater than 5 years. Fishing mortality estimates (F = 0.42) were similar to natural mortality estimates (M = 0.44). The age-based parameters estimated in the present study suggest that A. atelodus should be relatively resilient to fishing; nonetheless, the sizes and ages in landings are indicative of a stock heavily fished. The fishery is experiencing truncated age distributions and appears to be largely recruitment driven, increasing susceptibility to overexploitation. Determining geographical differences in growth rates of a population has important implications when considering impacts of anthropogenic drivers such as global warming and overexploitation and is important to determine in managing exploited fish populations.

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confidence: 99%

Geographical variation in age and growth of the endemic Australian sciaenid Atractoscion atelodus

Hegarty

Stewart

Gladstone

2021

Journal of Fish Biology

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Local adaptation of antipredator behaviors in populations of a temperate reef fish

Satterfield

Johnson

2020

Oecologia

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A global review of marine recreational spearfishing

Sbragaglia,

Arlinghaus,

Blumstein

et al. 2023

Rev Fish Biol Fisheries

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Recreational spearfishing is a fishing method that occurs globally, yet receives considerably less attention in the scientific literature relative to other recreational fishing methods, such as angling. Lack of scientific information on spearfishing may negatively affect the development and management of marine recreational fisheries. We conducted a systematic review of 102 peer-reviewed papers published between 1967 and 2022 pertaining to marine recreational spearfishing. Based on this literature review, we provide an overview of key insights across social, economic, and ecological dimensions of marine recreational spearfishing. While spearfishers represent less than 5% of marine recreational fishers, the participants are younger and may differ from recreational anglers in their motivations, with suggestions of increased well-being generated from a close connection with the sea during underwater fishing. Recreational spearfishers mostly target species of moderate to high levels of vulnerability that are mid to high trophic level carnivores. Though spearfishers can deliberately target larger individuals of exploited populations, this is not a generalizable pattern. Despite a growing body of research on the ecological impacts of marine recreational spearfishing, there is limited knowledge of these effects and their mechanisms across biological levels of organization (e.g., individual, population, community and ecosystem) compared with those of other fishing methods. Recreational spearfishers can contribute to advances in marine ecological knowledge, and inclusive participatory management could represent a key step towards transformative sustainable development of marine recreational spearfishing. Throughout the review, we identify gaps in the research and areas where future research is needed to better inform the socio-economic importance, ecosystem impacts and future management of marine recreational spearfishing.

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Geographic variation in demography of black perch (Embiotoca jacksoni): Effects of density, food availability, predation, and fishing

Cited by 5 publications

References 53 publications

Geographical variation in age and growth of the endemic Australian sciaenid Atractoscion atelodus

Geographical variation in age and growth of the endemic Australian sciaenid Atractoscion atelodus

Local adaptation of antipredator behaviors in populations of a temperate reef fish

A global review of marine recreational spearfishing

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