Dinâmica populacional do tucunaré cichla temensis (humboldt, 1833) do médio Rio Negro, Amazonas, Brasil
This study intended to estimate peacock bass Cichla temensis age and populations parameters at the middle Negro river, by the analysis of fish scale growing mark. The samples were caught between October/2011 and September/2012 in the main channel and adjacent lakes, situated at the Barcelos munic...
| Autor principal: | Campos, Caroline Pereira de |
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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/1/11234 http://lattes.cnpq.br/2744050600899345 |
| Resumo: |
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This study intended to estimate peacock bass Cichla temensis age and populations
parameters at the middle Negro river, by the analysis of fish scale growing mark. The
samples were caught between October/2011 and September/2012 in the main
channel and adjacent lakes, situated at the Barcelos municipality - AM. Were
estimated the following biological index and population parameters: Kn (relative
factor of condition), IGS (Gonadosomatic Index), L∞ (asymptotic length), k (growing
coefficient), A0,95 (longevity), PxC (weight-length relation), L50 (first gonad maturation
length), M (natural mortality), Z (total mortality) and F (mortality by fisheries). The
growing mark formations period were inspected by the relative marginal increment
(IMR), a total of 250 individual. Were possible to identify six growing mark in the
scale of C. temensis. The annual variations observed in the Kn suggests that fat
accumulation occurs in the dry seasons, once the environmental retractions
facilitates to peacock bass the capture of their prey. The IGS results indicated that
the period of more reproductive activity occurred in the falling water, its indicates that
the fish have an energetically deficit in their organisms related to reproductive
activity. Were observed using the IMR analysis that C. temensis forms a ring per
year, in the falling period and presenting an allometric growth positive (b>3). The
population parameters estimated for C. temensis were: L50 = 31,11 cm; L∞ = 68,05
cm; k = 0,20.year-1; A0,95 = 14 years; M = 0,49.year-1; Z = 0,84.year-1 and F =
0,34.year-1. The growing study realized for C. temensis confirms that the marks in the
calcified structures could be used as fish age index and growing rate for tropical
regions. |