Geographic variation in life-history traits of the long-lived monacanthid Meuschenia scaber (Monacanthidae)

Visconti, Valerio; Trip, Edl; Griffiths, Matthew; Clements, Kendall D.

doi:10.1007/s00227-019-3628-8

Cited by 5 publications

(6 citation statements)

References 43 publications

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“…During monsoon, due to inclement weather conditions and sea state, the shallow and inshore waters are trawled extensively, whereas during other seasons, weather conditions and sea state are favourable, and trawling is carried out offshore in deeper waters. It is likely that the larger individuals inhabit the deeper waters and the smaller individuals dwell in the shallower waters, as observed for other monacanthids, such as Meuschenia scaber (Visconti et al, 2020), Stephanolepis hispidus (Mancera-Rodríguez & Castro-Hernández, 2015a) and Nelusetta ayruadii (Miller & Stewart, 2013). The majority of the individuals caught along western Bay of Bengal were from depths <100 m, with few landed from beyond, and the maximum inhabiting depth recorded was 124 m. With an earlier report (Froese & Pauly, 2019) suggesting maximum vertical distribution of up to 80 m depth for A. monoceros, present study provides new insights on the distributional range for the species with probable extension in habitat.…”

Section: Discussionmentioning

confidence: 87%

“…are still unknown and need investigation. Age determination by otoliths or dorsal spines in monacanthids is challenging and limited due to the dimension, unusual shape and fragility of these structures (Visconti et al, 2020). Also, gonadal histology, which could not be performed in the present study, should be attempted in future for strongly supporting the macroscopic descriptions.…”

Section: Discussionmentioning

confidence: 93%

“…Again, the habitat difference in terms of environmental conditions and food availability between the Arabian Sea (in the earlier study) and Bay of Bengal (in the present study) could also have impacted the size at sexual maturity. Diversion of more energy for reproduction by females and for territory defence by males, a phenomenon common in monacanthids (Visconti et al, 2020), is the reason for the longer maturation time in males compared with females.…”

Section: Discussionmentioning

confidence: 99%

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Reproductive and feeding biology of unicorn leatherjacket, Aluterus monoceros from the Bay of Bengal, Northern Indian Ocean

et al. 2021

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No prior comprehensive information on the reproductive biology and trophodynamics of Aluterus monoceros was globally available. The present study was performed on 1036 individuals landed along the western Bay of Bengal during 2017 to 2019. Length ranged between 25.3–64.4 cm in females (mean at 48.34 cm) and from 21.5–64.1 cm in males (mean at 47.83 cm). Growth was negatively allometric with no significant difference between sexes. Sex ratio (F:M) was 1.03 with variations based on sizes and months. Size at sexual maturity for females and males was 40.85 and 41.60 cm, respectively. The species spawned throughout the year with major and minor peaks during February to May and October and November. Absolute fecundity increased linearly with length and weight and ranged from 33,640 eggs to 12,39,202 eggs. Stomachs were empty or with trace amounts of food in 59.17%, part-full in 34.07% and full in 6.76% of the fishes. Stomach vacuity and fullness and predator–prey weight ratios varied with an increase in body size, implying higher feeding intensity in large-sized fishes. Feeding activity was more intense during June–August and less during the peak spawning months. The species is omnivorous and a bottom feeder. Teleosts contributed the most to the prey items (43.23% by Index of Preponderance) implying preference for carnivory. Ontogenetic shifts and seasonal variations in prey items were observed. The present study provides paramount information that can significantly contribute to the management and conservation of monacanthid stocks in northern Indian Ocean.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

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Reproductive and feeding biology of unicorn leatherjacket, Aluterus monoceros from the Bay of Bengal, Northern Indian Ocean

et al. 2021

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“…The disparity of the sex can be imputed to differential growth rates, differential catchability of sexes or sex-based and spatio-temporal species aggregations (Morato et al, 2003;Rossoni et al, 2010). Various authors have reported that sex ratio could be influenced by the fishery (gear selectivity and location), exploitation rate, schooling behaviour, parental care, ecological factors such as temperature (Bohlen et al, 2008;Imam et al, 2012) and also may be due to vertical migrations corresponding with either feeding habits or spawning tendency (Visconti et al, 2020). In the present study, the trawlers and purse seiners employed pelagic trawl nets and purse seine nets, respectively for harvesting Odonus niger.…”

Section: Reproductive Biologymentioning

confidence: 99%

First report on the diet and reproductive biology of red-toothed triggerfishOdonus niger(Ruppell, 1836) from the south-eastern Arabian Sea

Suyani¹,

Rajesh²,

Rajesh

2021

J. Mar. Biol. Ass.

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The feeding habits and reproductive biology of red-toothed triggerfish Odonus niger (Ruppell, 1836) was analysed from 449 specimens collected from the Karnataka coast of the south-eastern Arabian Sea. Of the total stomachs examined, only 54 (12%) were empty and 395 contained food remains. The diet comprised crustacean remains (48.0%), zooplankton (21.4%), algae (16.5%), fish remains (6.1%) and cephalopod remains (5.3%) along with partially digested matter (2.3%) and detritus (0.4%). The species was found to be a generalist feeder and an omnivore. The overall sex ratio between males and females (1: 0.44) was significantly (P < 0.05) different. Histological examination of the ovaries indicated asynchronous ovarian development in females, with males maturing earlier than females. The gonadosomatic index (GSI) patterns of males and females, and the presence of ripe ovaries and spermatozoids suggested that April–May is the peak spawning period. The absolute and relative fecundity estimates ranged from 16,464–312,420 eggs and 251–2812 eggs g−1 respectively. Fecundity was positively correlated with total length and body weight. The biological information on diet composition and reproductive traits provided for the first time in this study can facilitate conservation, management and sustainable exploitation of this species in the study area.

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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).…”

mentioning

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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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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Geographic variation in life-history traits of the long-lived monacanthid Meuschenia scaber (Monacanthidae)

Cited by 5 publications

References 43 publications

Reproductive and feeding biology of unicorn leatherjacket, Aluterus monoceros from the Bay of Bengal, Northern Indian Ocean

Reproductive and feeding biology of unicorn leatherjacket, Aluterus monoceros from the Bay of Bengal, Northern Indian Ocean

First report on the diet and reproductive biology of red-toothed triggerfishOdonus niger(Ruppell, 1836) from the south-eastern Arabian Sea

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

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