Área De Desova E Recrutamento Para Peixes De Interesse Comercial No Baixo Amazonas: Implicações Para Conservação

Zacardi, Diego Maia; Ponte, Silvana Cristina Silva da; Oliveira, Lucas Silva de; Cajado, Ruineris Almada; Santos, Luan Robson Bentes dos

doi:10.22533/at.ed.0201929073

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“…The increase in fishing effort associated with anthropogenic activities, such as river damming for hydroelectric power generation, extreme weather events, water pollution, and degradation of floodplain areas, threatens the reproduction, development, recruitment, and, consequently, replenishment of Amazonian fish stocks (Cajado et al, 2022; Oliveira et al, 2023; Sousa et al, 2021; Souza & Feitoza, 2022). Consequently, previously underexploited species, such as Rhytiodus microlepis Kner, 1858, are likely to become part of the commercially valuable fish group in regional markets, serving as an alternative fishery resource (Souza & Feitoza, 2022; Zacardi, 2020; Zacardi et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Early ontogeny of the freshwater fish Rhytiodus microlepis (Characiformes, Anostomidae) from the Amazon basin

Santos,

Oliveira,

Silva

et al. 2024

Journal of Fish Biology

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The early development of the freshwater fish Rhytiodus microlepis is characterized by the description of external morphological, meristic, and morphometric changes, as well as the growth patterns, thereby establishing a reference for the identification of its larvae and juveniles. Specimens were collected from the Amazon river channel and floodplain. Ninety‐seven individuals were analysed with standard length varying between 4.31 and 79.23 mm. Rhytiodus microlepis larvae are altricial, with an elongated and fusiform body, anal opening reaching the middle region of the body, and simple nostrils becoming double and tubular during development. The pigments vary from one to two chromatophores in the dorsal region of the head in pre‐flexion and flexion, but later the pigmentation pattern intensifies, transverse bands appear along the body, and a conspicuous spot appears in the basal region of the caudal fin. The total number of myomeres ranges from 49 to 50. During the transition from larval (post‐flexion) to the juvenile periods, the most significant anatomical changes occur, such as the presence of all fins and increased body pigmentation. Integrated myomere count and pigmentation pattern are effective for the correct identification of the initial life stages of R. microlepis from the Amazon basin. Our results expand the knowledge about the early life history of Neotropical freshwater fish species.

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