Biologia reprodutiva e estrutura da população do Tucunaré Cichla vazzoleri (Perciformes: Cichlidae) no Reservatório da Hidrelétrica de Balbina, Amazonas, Brasil.
This study aimed to assess the population structure, reproductive parameters and abundance of Cichla vazzoleri from Balbina Reservoir, between October/2011 and September/12. Fish were caught using baited hook and seinenet. The population structure was analyzed by size distribution, sex ratio and...
| Autor principal: | Horie, Cesar Augusto Chirosa |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/11269 http://lattes.cnpq.br/1533905032019122 |
| Resumo: |
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This study aimed to assess the population structure, reproductive parameters
and abundance of Cichla vazzoleri from Balbina Reservoir, between
October/2011 and September/12. Fish were caught using baited hook and
seinenet. The population structure was analyzed by size distribution, sex ratio
and mean length at first maturity; reproductive characteristics were estimated
by means spawning type and period, fecundity and body indices. The
population structure showed a prevalence of small and medium sized
individuals, the mean size at first maturity for the species was 26.7 cm and all
individuals above 34 cm of total length were breeding adults. The reproduction
of C. vazzoleri occurred throughout the year, being more intense between
October and January; the species is a multiple spawner and it showed mean
fecundity of 5713 oocytes. Fish sampled from the left reservoir margin showed
higher mean size, reproductive activity, abundance and biomass when
compared to fish from the opposite margin. Other approaches are needed to
improve understanding of population dynamics on both sides. The results
presented here may be useful as basis for the planning of fishery resources in
Balbina Reservoir. |