Spatial variation in demography of an estuarine teleost: implications for population and fishery assessments

Gray, Charles A.

doi:10.3354/ab00623

Cited by 8 publications

(11 citation statements)

References 72 publications

(82 reference statements)

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“…counted) on some individuals until late summer (February). This spring-summer timing of completion of opaque zone formation concurs with that observed for western populations of S. robusta and a range of other east Australian coastal and estuarine teleosts, including platycephalids (Barnes, Gray, & Williamson, 2011;Gray, Gale, Stringfellow, & Raines, 2002), scorpaenids (Stewart & Hughes, 2010), girellids (Gray, Ives, Macbeth, & Kendall, 2010;Stocks et al, 2014) and sparids (Gray, 2015;Hughes, Stewart, Kendall, & Gray, 2008).…”

Section: Age and Growthsupporting

confidence: 85%

Length- and age-based demographics of exploited populations of stout whiting,Sillago robustaStead, 1908

et al. 2017

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Summary This study assessed variability in the length and age compositions, longevity, length‐at‐age and rates of growth and mortality of the east Australian stout whiting Sillago robusta Stead, 1908 population harvested by demersal trawl fisheries. Sampling was done over 2 years and was spatially stratified across three depth strata between 11 and 90 m at two locations approximately 400 km apart. There were no consistent depth‐related differences in length and age compositions, but the mean and median length and age of the population was greater at the lower latitude location. Age classes 2 and 3 years dominated samples in the north, and 1 and 2 years in the south. Observed longevity was 10 years in the north, and 6 years in the south. Mean length‐at‐age was not consistently different between sexes, years or locations, nor did the von Bertalanffy growth function differ significantly between sexes, even though females had a greater estimated L∞ (23.45 cm FL) compared to males (22.36 cm FL). Estimated natural mortality (M) ranged between 0.42 and 0.77, using age‐ and length‐based methods. Age‐based catch‐curve analyses identified the instantaneous rate of total mortality (Z) to range between 1.48 and 2.70, with subsequent estimates of fishing mortality (F) ranging between 1.15 and 2.00, being greater than M. Exploitation rates (E) were greater than 0.7, indicating that S. robusta at the study locations was heavily fished. The data provided here can be used as a basis to evaluate future fishery‐ and climate‐related changes in the population demographics of east Australian S. robusta.

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Section: Age and Growthsupporting

confidence: 85%

Length- and age-based demographics of exploited populations of stout whiting,Sillago robustaStead, 1908

et al. 2017

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“…This species occurs throughout south‐eastern Australia (southern Queensland to southern New South Wales/Victoria; Iwatsuki , Stewart, Hegarty, Young, Fowler, & Craig, ) whereas a panmictic stock (Roberts & Ayre, ) they undertake migrations from estuarine to oceanic areas for spawning (Curley, Jordan, Figueira, & Valenzuela, ; Pollock, ). Such movements are facilitated by wide salinity (<10–35 PSU) and temperature tolerances (19–38°C) (Froese & Pauly, ; Gray, ; Uhlmann, Broadhurst, & Millar, ). Along with numerous closely related congenerics, which are distributed more broadly throughout the Indo‐Pacific (Iwatsuki ), yellowfin bream have a relatively higher market value than many coharvested species (Curley et al, ; Froese & Pauly, ).…”

Section: Introductionmentioning

confidence: 99%

“…This species occurs throughout south-eastern Australia (southern Queensland to southern New South Wales/Victoria; Iwatsuki 2013, Stewart, Hegarty, Young, Fowler, & Craig, 2015 whereas a panmictic stock (Roberts & Ayre, 2010) they undertake migrations from estuarine to oceanic areas for spawning (Curley, Jordan, Figueira, & Valenzuela, 2013;Pollock, 1984). Such movements are facilitated by wide salinity (<10-35 PSU) and temperature tolerances (19-38°C) (Froese & Pauly, 2017;Gray, 2015;Uhlmann, Broadhurst, & Millar, 2015).…”

Section: Introductionmentioning

confidence: 99%

Climate change does not affect the seafood quality of a commonly targeted fish

Coleman

Butcherine

Kelaher

et al. 2018

Global Change Biology

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Climate change can affect marine and estuarine fish via alterations to their distributions, abundances, sizes, physiology and ecological interactions, threatening the provision of ecosystem goods and services. While we have an emerging understanding of such ecological impacts to fish, we know little about the potential influence of climate change on the provision of nutritional seafood to sustain human populations. In particular, the quantity, quality and/or taste of seafood may be altered by future environmental changes with implications for the economic viability of fisheries. In an orthogonal mesocosm experiment, we tested the influence of near‐future ocean warming and acidification on the growth, health and seafood quality of a recreationally and commercially important fish, yellowfin bream (Acanthopagrus australis). The growth of yellowfin bream significantly increased under near‐future temperature conditions (but not acidification), with little change in health (blood glucose and haematocrit) or tissue biochemistry and nutritional properties (fatty acids, lipids, macro‐ and micronutrients, moisture, ash and total N). Yellowfin bream appear to be highly resilient to predicted near‐future ocean climate change, which might be facilitated by their wide spatio‐temporal distribution across habitats and broad diet. Moreover, an increase in growth, but little change in tissue quality, suggests that near‐future ocean conditions will benefit fisheries and fishers that target yellowfin bream. The data reiterate the inherent resilience of yellowfin bream as an evolutionary consequence of their euryhaline status in often environmentally challenging habitats and imply their sustainable and viable fisheries into the future. We contend that widely distributed species that span large geographic areas and habitats can be “climate winners” by being resilient to the negative direct impacts of near‐future oceanic and estuarine climate change.

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“…; Neuheimer and MacKenzie ). Demographic changes may affect community structure and function but also have practical implications for fisheries management and conservation (Gray ; Audzijonyte et al. ).…”

mentioning

confidence: 99%

“…Most ectotherms within their normal thermal range demonstrate higher growth and maturation rates after small temperature increases, but above a threshold temperature metabolic costs increase, leading to lower productivity and contracted geographical distribution ranges (Neuheimer et al 2011;Neuheimer and MacKenzie 2014). Demographic changes may affect community structure and function but also have practical implications for fisheries management and conservation (Gray 2015;Audzijonyte et al 2016).…”

mentioning

confidence: 99%

Life History of the Gray Snapper at the Warm Edge of Its Distribution Range in the Caribbean

Andrade

Santos

2019

Mar Coast Fish

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Knowledge of the life history of populations at the warm edge of their distributional range can provide a better understanding of how they will adapt to climate warming, including potential poleward redistribution. The range of Gray Snapper Lutjanus griseus has the potential to expand along its northern temperate fringe, but little is known about this species in the warmest portion of its range. We studied the age, growth, reproduction, and mortality of commercially caught Gray Snapper in the Guatemalan Caribbean, where sea surface temperature consistently exceeds 26°C. Longevity was estimated as 10 years, and von Bertalanffy growth parameters that were consolidated through Bayesian estimation incorporating earlier estimates from the Caribbean region were as follows: asymptotic length (L∞) was 35 cm, the growth coefficient (K) was 0.56 year−1, and the theoretical age at zero length (t0) was −0.7 year. Gray Snapper grew slowest in April, prior to the rainy season, and at the onset of the reproductive season, which lasted to September. Fifty percent of the Gray Snapper matured at 31 cm and at 3.5 years of age. Gray Snapper had a lower maximum size, longevity, and peak reproductive investment, a protracted spawning season and reproductive life span, and elevated natural mortality at the warm edge of their distribution relative to temperate climates. Despite the plasticity in life history of Gray Snapper observed in this study, their potential to further adapt to warming remains unknown.

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Spatial variation in demography of an estuarine teleost: implications for population and fishery assessments

Cited by 8 publications

References 72 publications

Length- and age-based demographics of exploited populations of stout whiting,Sillago robustaStead, 1908

Length- and age-based demographics of exploited populations of stout whiting,Sillago robustaStead, 1908

Climate change does not affect the seafood quality of a commonly targeted fish

Life History of the Gray Snapper at the Warm Edge of Its Distribution Range in the Caribbean

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