Spatial variation in life history characteristics of snapper (<i>Pagrus auratus</i>) within Shark Bay, Western Australia

Jackson, Gary; Norriss, J.; Mackie, Michael C.; Hall, Norman G.

doi:10.1080/00288331003641646

Cited by 26 publications

(6 citation statements)

References 27 publications

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“…Silky sharks of Indonesian waters mature at older ages, males at 13–14 years and females at 14–16 years (Hall et al ., 2012). These geographic variations in the length and age at maturity of fishes may be due to the spatial variations in growth, biophysical environments and density-dependent responses to fishing-induced changes in spawning biomass (Roff, 2002; Colonello et al ., 2007; Jackson et al ., 2010).…”

Section: Discussionmentioning

confidence: 99%

Biological aspects of silky shark Carcharhinus falciformis in the eastern Arabian Sea

Varghese¹,

Gulati²,

Unnikrishnan³

et al. 2015

J. Mar. Biol. Ass.

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Reproduction, diet and growth of silky shark Carcharhinus falciformis in the eastern Arabian Sea are described based on 473 specimens collected from the gillnet-cum-longline landings at the Cochin fisheries harbour during 2012–2014. The reproductive biology of 215 males and 258 females was examined while 113 stomachs were sampled to study the diet. The von Bertalanffy growth parameters estimated using length-based models were asymptotic length (L∞) = 309.80 cm, growth coefficient (K) = 0.10 year−1 and age at zero length (t0) = −2.398 year. The sex ratio was significantly skewed to females. Seasonality in reproduction was not evident and in males, sexual maturity was attained at 201–223 cm total length (LT) with the size at maturity (LT50) occurring at 217.0 cm, whereas in females sexual maturity was attained at 224–231 cm LT and LT50 occurs at 226.5 cm. In total 114 embryos, in the length range of 12.2–65.1 cm were recovered from 15 pregnant females. Numbers of embryos in females were in the range of 3–13, averaging 7.6. Silky sharks of the eastern Arabian Sea feed primarily on swimming crab Charybdis smithii, with juveniles feeding principally on swimming crabs, while adults feed on actively swimming prey like squids and teleost fishes. This preliminary information on the reproduction, diet and growth should be useful to identify management strategies for silky sharks in the eastern Arabian Sea.

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Section: Discussionmentioning

confidence: 99%

Biological aspects of silky shark Carcharhinus falciformis in the eastern Arabian Sea

Varghese¹,

Gulati²,

Unnikrishnan³

et al. 2015

J. Mar. Biol. Ass.

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“…Spawning season also varies with location in WA occurring in late-autumn through to early spring in the Shark Bay region (Wakefield 2006;Jackson et al 2010), spring to summer on west coast and summer on south coast (Wakefield 2006). Spawning is typically highly localized and occurs mostly in similar locations each year (e.g.…”

Section: Life Cycle Age and Growth Reproductionmentioning

confidence: 99%

Management Adaptation to Climate Change Effect on Fisheries in Western Australia

Caputi

Lestang

Feng

et al. 2017

Climate Change Impacts on Fisheries and Aquaculture

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“…In addition, snapper has been exploited by the commercial and recreational fishing sectors since the early 19th century, and these fishing activities have been extensively documented (Thurstan et al, 2016;Welsby, 1905). Lastly, snapper grows at a faster rate (k = 0.18) than the giant grouper (k = 0.12) and occurs at higher abundances, making it an ideal candidate to compare the effects of fishing on two co-existing but biologically different species (Bullock et al, 1992;Jackson et al, 2010;Leitão et al, 2016).…”

Section: Probability Of Capturementioning

confidence: 99%

Diving into archival data: The hidden decline of the giant grouper (Epinephelus lanceolatus) in Queensland, Australia

Chong‐Montenegro,

Thurstan,

Pandolfi

2024

Aquatic Conservation

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The giant grouper (Epinephelus lanceolatus) is the largest reef fish in the Indo‐Pacific (~2.5 m TL, >400 kg), and it is highly susceptible to overfishing. Despite regional protections and documented population declines, the species is listed by IUCN as Data Deficient due to minimal long‐term population data and a paucity of life history information. This study used historical fishing records derived from newspaper articles, fishing magazines, grey literature and naturalists' descriptions to collate life history information and reconstruct giant grouper population trends from 1854 to 1958 in Queensland, Australia. Historical recreational catch trends of four biologically distinct grouper size classes demonstrated that over 92 years, fishing disproportionately affected two size classes: immature (fish below reproductive size) and mature individuals. Changes in the probability of capturing a grouper within a recreational fishery were examined as a proxy of relative abundance. The probability of catching a giant grouper within a popular recreational fishery significantly declined from 81% in 1860 to 2% in 1958. Further analysis based on a non‐probabilistic method of giant grouper sighting records showed fluctuations in the giant grouper population trajectory, from a steady decline during the early 20th century to an increase during WWII (1939–1945) followed by a reduction in the last half of the 20th century. This study highlights the importance of archival sources to uncover population trends of rare species by combining quantitative assessments and biological inferences to determine the timing and occurrence of population declines and recoveries and inform how vulnerable fish species respond to the cumulative effects of fishing over time.

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Spatial variation in life history characteristics of snapper (Pagrus auratus) within Shark Bay, Western Australia

Cited by 26 publications

References 27 publications

Biological aspects of silky shark Carcharhinus falciformis in the eastern Arabian Sea

Biological aspects of silky shark Carcharhinus falciformis in the eastern Arabian Sea

Management Adaptation to Climate Change Effect on Fisheries in Western Australia

Diving into archival data: The hidden decline of the giant grouper (Epinephelus lanceolatus) in Queensland, Australia

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