Spawning, maturity, growth and movement of <i>Platycephalus fuscus</i>
 (Cuvier, 1829) (Platycephalidae): fishery management considerations

Gray, Charles A.; Barnes, Lachlan M.

doi:10.1111/jai.12703

Cited by 24 publications

(24 citation statements)

References 46 publications

(68 reference statements)

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“…Alternatively, early aged S. robusta could, as a life history strategy, migrate northwards to more tolerable conditions and to spawn. Several teleost (Gray & Barnes, ; Gray et al., ) and invertebrate (Montgomery, ; Stewart & Kennelly, ) species migrate northward into the prevailing East Australian Current to spawn, with eggs and larvae transported southward to higher latitude nursery habitats (Suthers et al., ).…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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

et al. 2017

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“…The apparently anomalous 81 very high ratio for TL ∞ s for the two sexes of P. fuscus is related to the TL ∞ for females being far greater than 582 the maximum individual TL, whereas the reverse is markedly the case for males (see Fig. 6 in Gray and 583 Barnes, 2015). For this reason, the TL ∞ s for P. fuscus were not included in Fig.…”

Section: Maximum Total Lengths and Ages And Growth 562mentioning

confidence: 99%

“…They were also used to explore 1) the hypothesis that early growth in the populations of the two species 13 living in estuaries is greater than in those of the three species occupying coastal marine waters and 2) the 14 possibility that the two estuarine populations have been subjected to detectable exploitation. The biological 15 data for the five species in south-western Australia were then collated with those recorded for several 16 species in this family, in central southern and eastern Australia Gray and Barnes, 2015), Japan (Masuda, 2000) and the Suez Canal (Sabrah et al, 18 2015). Finally, the data were used to test the hypothesis that the overall sex ratio is positively related to the 19 magnitude of the differences between both the TL ∞ and maximum TLs attained by the females and males.…”

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confidence: 99%

“…The substantial size attained early in life by P. westraliae in the Swan River Estuary and 04 pronounced similarity in the growth curves of the females of P. speculator and P. westraliae is particularly 14 striking since the diets of these two species differ markedly, with the former feeding predominantly on carid 15 crustaceans throughout life, whereas the latter feeds mainly on a range of invertebrates when small and on 16 teleosts when large (Coulson et al, 2015). Furthermore, as the early growth of P. fuscus was even more 17 rapid than in P. westraliae and P. speculator and all other species elsewhere in Australia, it is relevant that 18 this platycephalid spends at least much of its life in estuaries (Pollock, 2014; Gray and Barnes, 2015). 19…”

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Variations in biological characteristics of temperate gonochoristic species of Platycephalidae and their implications: A review

Coulson

Hall

Potter

2017

Estuarine, Coastal and Shelf Science

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This review provides a composite account of the biological characteristics of the temperate 17 gonochoristic species of the Platycephalidae. Initially, data were obtained for the five abundant platycephalid 18 species in south-western Australia, which each came from either over bare substrata or seagrass and from either 19 estuaries, marine coastal waters or marine embayments. The von Bertalanffy growth curves for females and 20 males of each species differed significantly, with females having a greater TL ∞ and lower growth coefficient k. 21From tests using their upper deciles, the total length (TL) attained by the largest females of each species was 22 significantly greater than that of their males, whereas such a trend did not occur with age. The ratio of females to 23 males in each abundant age class, and overall, exceeded parity for four of the five species (typically P < 0.001) 24 and increased with increasing TL. Mortality estimates, which were similar for each sex of each species, suggest 25 that Platycephalus speculator has been substantially exploited in a seasonally-closed estuary in which it 26 completes its whole life cycle. The above and other biological data for the five species were collated with those 27 published previously for two of those species and five other platycephalid species in south-eastern Australia and 28 one in Japan and another in the Suez Canal, yielding the following conclusions for gonochoristic species of the 29 Platycephalidae. Females attain a larger size than males, the extent varying markedly among species, whereas the 30 longevities of the two sexes of each platycephalid species are similar. The maximum TLs and ages of the various 31 species range widely, with values for females, for example, extending from 221 mm for Ambiserrula jugosa to 32 985 mm for Platycephalus fuscus and from four years for A. jugosa to 26 years for Platycephalus conatus. The 33 overall ratio of females to males is positively related to the extent to which both the maximum TLs and TL ∞ s of 34 the females exceed those of males. The above trends imply that growth, rather than differences in longevity 35 and/or mortality, is the main factor contributing to the marked differences in sex ratios, which ranged widely 36 from parity to 3.2:1. As the length at maturity, but not typically age at maturity, was greater for females than 37 males, maturity is also related mainly to growth. The spawning periods of the various species overlapped, 38 commencing as early as late winter/early spring, as temperatures started rising with four species and later in late 39 spring/early summer with the three species found in estuaries, which would be advantageous as spawning in 40 estuaries would occur when environmental conditions are most favourable for spawning success and larval 41 retention. 42

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“…The population structure and the stock assessment of Platycephilus indicus were reported by [8,9]. The age compositions, Spawning, maturity and growth of Platycephalus fuscus were investigated by [10,11], and the age & growth of Platycephalus speculator was devoted by [12].…”

Section: Introductionmentioning

confidence: 99%

Age, Growth and Demographic Structures of Thorny Flathead <i>Rogadius asper</i>, Cuvier, 1829 (Pieces: Platycephalidae) from the Coastal Waters of the Suez Gulf

Sabrah¹

2015

AJLS

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The age and growth of the Olive tail Rogadius asper exploited by the demersal trawl fishery in the Gulf of Suez were investigated during the fishing season 2014/2015. Ageing was done by sagittal otoliths for a sample of 675 ranged from 9.2 to 25.9 cm in total length (TL) with mean of 17.4±2.95 cm. The sex ratio was skewed in favors of females (1.6:1), which tended to high in number and bigger in size than males. The maximum investigated age of females was 4 years and that of males was 3 years. The mean von Bertalanffy growth parameters for both sexes L∞= 26.43±0.22cm and K=0.47±0.03year-1 as estimated by four different methods. According to gender the growth was variable and significantly differed (P˂0.05=0.002). Females attained a greater mean L∞= 27.2±0.44cm than males L∞=24.0±0.26 cm and males displayed greater mean k value 0.53±0.02 year-1 than that of females K=0.43±0.01 year-1. Fish of age groups 1 and 2 years were dominated the age compositions of R. asper constituting 36.6% and 39.3 % respectively. The estimated value of total mortality, natural mortality and fishing mortality for the pooled data was: Z= 1.51±0.25, 0.58±0.09 and 0.93±0.08 year-1 respectively. It was indicated that the fishing mortality was more than one third (37.6%) of the derived natural mortality and exploitation rate was 0.62, indicating that the species was heavily exploited. Although R. asper is not a target species of commercial fisheries, it suffers high exploitation as part of the by-catch for its suitable market price for insufficient income.

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Spawning, maturity, growth and movement of Platycephalus fuscus (Cuvier, 1829) (Platycephalidae): fishery management considerations

Cited by 24 publications

References 46 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

Variations in biological characteristics of temperate gonochoristic species of Platycephalidae and their implications: A review

Age, Growth and Demographic Structures of Thorny Flathead <i>Rogadius asper</i>, Cuvier, 1829 (Pieces: Platycephalidae) from the Coastal Waters of the Suez Gulf

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Spawning, maturity, growth and movement of Platycephalus fuscus (Cuvier, 1829) (Platycephalidae): fishery management considerations

Cited by 24 publications

References 46 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

Variations in biological characteristics of temperate gonochoristic species of Platycephalidae and their implications: A review

Age, Growth and Demographic Structures of Thorny Flathead &lt;i&gt;Rogadius asper&lt;/i&gt;, Cuvier, 1829 (Pieces: Platycephalidae) from the Coastal Waters of the Suez Gulf

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Age, Growth and Demographic Structures of Thorny Flathead <i>Rogadius asper</i>, Cuvier, 1829 (Pieces: Platycephalidae) from the Coastal Waters of the Suez Gulf