Published November 16, 2011
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Reproductive characteristics and the weight-length relationship in Anableps anableps (Linnaeus, 1758) (Cyprinodontiformes: Anablepidae) from the Amazon Estuary
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Oliveira, Valéria de Albuquerque, Fontoura, Nelson Ferreira, Montag, Luciano Fogaça de Assis (2011): Reproductive characteristics and the weight-length relationship in Anableps anableps (Linnaeus, 1758) (Cyprinodontiformes: Anablepidae) from the Amazon Estuary. Neotropical Ichthyology 9 (4): 757-766, DOI: 10.1590/S1679-62252011005000042, URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400007&lng=en&tlng=en
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- In addition, for each gender and growth Stanza, Student's t test was used to determine whether the "b" value recorded for each sex was significantly different from 3, at the 5% significance level (Zar, 1999). This analysis is based on the fact that, when b = 3, growth is isometric, i.e., length increases at the same rate as weight, whereas when b is significantly different from 3 (higher or lower), growth is allometric (weight and length change at different rates).
- The different stages of gonadal maturation in the females were identified according to Vazzoler (1996). The gonadosomatic index (GSI) was calculated for each female, in order to establish the gonadal maturation curve, and thus identify the breeding season. The index is given by GSI= GW/W x 100, where GSI = gonadosomatic index; GW = gonad weight, and W = total weight. The monthly variation in the GSI values was also tested using the Kruskal-Wallis analysis of variance, with α = 0.05.
- The developmental stages of the embryos collected during the study were also defined, based on the size of the embryo and the vitelline sac. The stages of embryonic development used here were adapted from the scheme proposed by Nascimento & Assuncao (2008) and were illustrated using a Leica M205A digital camera and the LAS automounting program.