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<p>Roosterfish (<i>Nematistius pectoralis</i>) are an important resource for recreational and artisanal fisheries. Although their diet is mainly piscivorous with ontogenetic changes (juvenile to adult), there is a lack of information regarding sexual segregation and seasonal changes in diet. This study analyzed the feeding habits and trophic level of roosterfish juveniles (27–48&#xa0;cm) in La Paz Bay, B.C.S., comparing sexes (males and females) and seasons (warm vs. cold). A total of 170 stomachs obtained from March 2022 to April 2023 were analyzed, and a total of 29 prey items were identified (21 fishes, two bivalves, one isopod, and one crustacean). The prey-specific index of relative importance (%PSIRI) revealed that five prey items comprised 54.78% of the diet: <i>Opisthonema libertate</i> (14.25%), fish remains (13.62%), <i>Lile stolifera</i> (13.09%), <i>Anchoa</i> spp. (10.8%), and <i>Etrumeus acuminatus</i> (6.32%). The 24 remaining items made up 41% of the diet. There were no significant differences between the sexes, but there were differences between seasons (PERMANOVA). Levin’s Index (<i>B</i><sub><i>i</i></sub> = 0.32) showed a narrow trophic breadth, consistent between sexes and seasons. Costello’s graphs showed a piscivorous feeding strategy, with high interindividual variations: each individual fish fed on large amounts of few prey items. Roosterfish had a trophic level of 3.83, which was similar between sexes and seasons. We concluded that roosterfish juveniles are tertiary consumers; they are pelagic coastal opportunistic ichthyophagous predators, whose diet comprises prey that form abundant schools off the southwestern Gulf of California.</p>

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Feeding habits of roosterfish Nematistius pectoralis juveniles from La Paz Bay in the Gulf of California

  • 期刊论文

  • 发表日期：

    2026年6月21日

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  • Ailyn Rodríguez-Pozo,
  • Xchel G. Moreno-Sánchez,
  • Marina S. Irigoyen-Arredondo,
  • Arturo B. Enríquez-García,
  • Fernando R. Elorriaga-Verplancken

摘要

Roosterfish (Nematistius pectoralis) are an important resource for recreational and artisanal fisheries. Although their diet is mainly piscivorous with ontogenetic changes (juvenile to adult), there is a lack of information regarding sexual segregation and seasonal changes in diet. This study analyzed the feeding habits and trophic level of roosterfish juveniles (27–48 cm) in La Paz Bay, B.C.S., comparing sexes (males and females) and seasons (warm vs. cold). A total of 170 stomachs obtained from March 2022 to April 2023 were analyzed, and a total of 29 prey items were identified (21 fishes, two bivalves, one isopod, and one crustacean). The prey-specific index of relative importance (%PSIRI) revealed that five prey items comprised 54.78% of the diet: Opisthonema libertate (14.25%), fish remains (13.62%), Lile stolifera (13.09%), Anchoa spp. (10.8%), and Etrumeus acuminatus (6.32%). The 24 remaining items made up 41% of the diet. There were no significant differences between the sexes, but there were differences between seasons (PERMANOVA). Levin’s Index (Bi = 0.32) showed a narrow trophic breadth, consistent between sexes and seasons. Costello’s graphs showed a piscivorous feeding strategy, with high interindividual variations: each individual fish fed on large amounts of few prey items. Roosterfish had a trophic level of 3.83, which was similar between sexes and seasons. We concluded that roosterfish juveniles are tertiary consumers; they are pelagic coastal opportunistic ichthyophagous predators, whose diet comprises prey that form abundant schools off the southwestern Gulf of California.