Produção Nacional
Early development of two commercially valuable fish from the lower Amazon River, Brazil (Characiformes: Serrasalmidae)
2022; Sociedade Brasileira de Ictiologia; Volume: 20; Issue: 1 Linguagem: Inglês
10.1590/1982-0224-2021-0024
ISSN1982-0224
AutoresLucas Silva de Oliveira, Ruineris Almada Cajado, Fabíola K. S. Silva, Marcelo Ândrade, Diego Maia Zacardi,
Tópico(s)Fish Ecology and Management Studies
ResumoAbstract We described the early development of Myloplus asterias and M. lobatus, two fish species of the Serrasalmidae using morphological, meristic, and morphometric characteristics. These herbivores serrasalmids are heavily fished because of their commercial importance in the Amazon. The individuals were collected between 2016 and 2020 in the limnetic zone of open water and macrophyte stands in the Lower Amazon River floodplain. We tested different growth models to identify the development pattern of these species. During the initial ontogeny, these two species can be differentiated mainly by the myomeres total number, 37 to 39 in M. asterias vs. 40 to 41 in M. lobatus, the pigmentation pattern, and dorsal-fin ray numbers. These characteristics are effective in distinguishing these species from other serrasalmids. The morphometric relationships were also different between these two species, showing distinct patterns in growth between the analyzed features. An identification key for larvae of some sympatric Serrasalmidae species from the Amazon basin is presented. Our expectation is that this study will contribute to the knowledge of the initial ontogeny and the biology of fish species in the Neotropical region.
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