Ontogenetic shifts in feeding habits of orangemouth weakfish (<i>Cynoscion xanthulus</i>): From estuarine benthic feeder to marine nektivore top predator

Muro-Torres, Víctor; Amezcua, Felipe; Green, Lucinda; Payan, Jorge; Balart‐Páez, Eduardo F.; Amezcua‐Linares, Felipe

doi:10.1111/maec.12735

Cited by 2 publications

(2 citation statements)

References 62 publications

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“…The size at sexual maturity (disc width at which 50% of the individuals in the population are sexually mature, DW 50 ) was estimated for each sex from the proportion of immature and mature individuals at each class interval, using the Gompertz model (asymmetric and non‐logistic curve) and the Brouwer and Griffiths model (symmetric logistic curve), avoiding the use of redundant models (Burnham & Anderson, 2002; García‐Rodríguez et al, 2020; Katsanevakis, 2006). Class intervals (bandwidth) were determined using the Sheather‐Jones selection procedure (Muro‐Torres et al, 2023; Sheather & Jones, 1991) in RStudio 2022.12.0 + 353.…”

Section: Methodsmentioning

confidence: 99%

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Size at sexual maturity, seasonal variation by maturity stages, and fecundity of the spotted round ray (Urobatis maculatus) and the thorny stingray (Urotrygon rogersi) from the northern tropical eastern Pacific

García‐Rodríguez,

Tovar‐Ávila,

Arellano‐Cuenca

et al. 2024

Journal of Fish Biology

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Round rays (family: Urotrygonidae) are commonly caught as by‐catch by shrimp trawl fisheries in the tropical eastern Pacific (TEP). However, little information on their life history and catch species composition exists for most round ray species, preventing the evaluation of the impact of fishing on their populations. The mean size at sexual maturity (DW50), seasonal variation by maturity stages, and fecundity for two round ray species caught during shrimp trawl research cruises in the south‐eastern Gulf of California (northern TEP) were estimated using a multi‐model approach and inference for the first time, to determine the part of the population of each species that is being affected by shrimp trawling. Disc width (DW) ranged from 7.0 to 30.9 cm for the spotted round ray (Urobatis maculatus), and 7.2–33.5 cm for the thorny stingray (Urotrygon rogersi), with females reaching larger sizes than males in both species. The DW50 was estimated at 12.8 and 11.8 cm DW for the males and females of U. maculatus, respectively, whereas for U.rogersi, it was 15.0 and 18.4 cm DW for males and females, respectively. Embryos were found in females ≥14.5 cm DW in both species. The maximum fecundity was five embryos for U. maculatus (mean = 3.1 ± 0.2 S.E., mode = 4), and six embryos for U. rogersi (mean = 3.0 ± 0.3 S.E., mode = 2). Fecundity and embryo size did not vary with maternal size. Male and female immature and mature individuals for both species, including pregnant females, were found in the catches in all seasons of the year. Our results can help determine the vulnerability of the studied species populations to fishing pressure from shrimp trawling in the northern TEP and guide the development of future monitoring strategies and conservation actions for these species, if necessary.

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Section: Methodsmentioning

confidence: 99%

“…Class intervals (bandwidth) were determined using the Sheather-Jones selection procedure (Muro-Torres et al, 2023;Sheather & Jones, 1991) in RStudio 2022.12.0 + 353.…”

Section: Size At Sexual Maturity (Dw 50 )mentioning

confidence: 99%

Size at sexual maturity, seasonal variation by maturity stages, and fecundity of the spotted round ray (Urobatis maculatus) and the thorny stingray (Urotrygon rogersi) from the northern tropical eastern Pacific

García‐Rodríguez,

Tovar‐Ávila,

Arellano‐Cuenca

et al. 2024

Journal of Fish Biology

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Feeding Habits of Scomber japonicus Inferred by Stable Isotope and Fatty Acid Analyses

Chen,

Hu,

Zhao

et al. 2024

JMSE

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Scomber japonicus is widely distributed off the coast of Japan and in the northwestern Pacific. It is an important target for fisheries. To reveal the differences in diet shifts and niche changes of S. japonicus, we collected samples in the high seas of the northwest Pacific (38°59′ N–43°00′ N, 150°30′ E–161°48′ E) from June to August 2021. We utilized stable isotope and fatty acid analyses to study the differences in body length and sex of S. japonicus. The results showed no significant differences in stable isotope values and fatty acid composition between male and female individuals (p > 0.05). Differences in δ13C and δ15N values among different body length groups were also not significant (p > 0.05). Both δ13C and δ15N values showed a trend of increasing and then decreasing across different body length groups. The niche width of S. japonicus in different body length groups first increased and then decreased, with niche overlap among the groups exceeding 60%. Principal component analysis (PCA) results showed that the main fatty acids in S. japonicus were C14:0, C16:0, C18:0, C16:1n-7, C18:1n-9, C18:3n-6, C20:5n-3, C20:4n-6 and 22:6n-3. Except for C18:0 and C20:4n-6, the content of the other fatty acids showed significant differences among different body length groups (p < 0.05). The results of the similarity analysis (ANOSIM) indicated that the fatty acid compositions of the 100–130 mm length group were significantly different from those of the 131–160 mm and 161–190 mm length groups (p < 0.05). However, there were no significant differences among the other size groups (p > 0.05). During the growth and development of S. japonicus, the proportion of krill in their diet gradually decreased. Meanwhile, their consumption of zooplankton, diatoms and fish significantly increased. Additionally, S. japonicus also consumed crustaceans, but their intakes of planktonic bacteria and green algae were relatively low. We suggested that there were no significant differences between male and female individuals of S. japonicus. As they grew and developed, the ecological niche and feeding habits of S. japonicus continuously changed.

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Ontogenetic shifts in feeding habits of orangemouth weakfish (Cynoscion xanthulus): From estuarine benthic feeder to marine nektivore top predator

Cited by 2 publications

References 62 publications

Size at sexual maturity, seasonal variation by maturity stages, and fecundity of the spotted round ray (Urobatis maculatus) and the thorny stingray (Urotrygon rogersi) from the northern tropical eastern Pacific

Size at sexual maturity, seasonal variation by maturity stages, and fecundity of the spotted round ray (Urobatis maculatus) and the thorny stingray (Urotrygon rogersi) from the northern tropical eastern Pacific

Feeding Habits of Scomber japonicus Inferred by Stable Isotope and Fatty Acid Analyses

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