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Morphometry of the largescale foureyes, Anableps anableps (Linnaeus, 1758), on the Caratateua estuary, Curuçá county, Pará State The largescale foureyes, Anableps anableps (Linnaeus, 1758), is a pelagic fish that lives in estuarine and freshwaters of equatorial regions of the American continent. It is endowed with a retina split into two halves that allows a fish to use both aerial and aquatic visions at the same time, is viviparous and gregarious. In the period from March, 2004 to February, 2005 a total of 145 individuals were 1 Bióloga, Pesquisadora Cepnor/Ibama. Email: robikeda@usp.br 2 Estagiária Cepnor/Ibama Bol. Téc. Cient. Cepnor, Belém, v. 5, n. 1, p. 93-103, 2005 94 MORFOMETRIA DO TRALHOTO, Anableps anableps (LINNAEUS, 1758), DO ESTUÁRIO DE... sampled at Caratateua estuary, Curuçá, Pará State, for which central tendency measures were estimated and the regression model fitted to a number of weight/ length relationships. Values for the overall range total length (TL) and overall range total weight (TW), respectively, were: females = 5.0 – 24.0 cm TL; 1.43 – 146.10 g TW; machos = 8.0 – 20.0 cm TL; 4.78 – 70.3 g TW. The frequency of embryos over pregnant females’ length distribution indicated a modal class at 19 cm TL. All weight/length regression equations showed a positive correlation with a high degree of statistical significance. No statistical differences were found to occur between the slopes of the following relationships: 1female x male; 2 – young female x young male; 3 – young male x adult male; 4 – adult female x adult male, implying the need for estimation of new equations with joint data. High statistically significant differences were observed between slopes of the relationships young x adult and young female x adult female.

MORFOMETRIA DO TRALHOTO, Anableps anableps (LINNAEUS, 1758), DOESTUÁRIO DE CARATATEUA – CURUÇÁ - PARÁ