Abstract

SANCHEZ PALACIOS, Jesús; BELTRAN ALVAREZ, Rigoberto  and  RAMIREZ LOZANO, Juan Pedro. Crecimiento y reproducción del camarón Atya margaritacea (Decapoda: Atyidae) en el Río Presidio, Sinaloa, México. Rev. biol. trop [online]. 2008, vol.56, n.2, pp.513-522. ISSN 0034-7744.

Growth and reproduction of the shrimp Atya margaritacea (Decapoda: Atyidae) in Río Presidio, Sinaloa, Mexico. Some growth and reproduction parameters of the population of the shrimp Atya margaritacea in Presidio River (Sinaloa, NW Mexico) were studied using 542 organisms collected with a Surber net in five sampling locations distributed from mid- to low river. Total lengths and gross weights ranged from 15 to 96 mm and 0.1 to 25.2 g. The male:female ratio was 1.96:1 and males had larger sizes and weights. The relations of total length (Lt) to gross weight (Pt) were Pt = 1.02x10^-5 (Lt)^3.2089 for males and Pt = 2.29x10^-5 (Lt)^3.0159 for females. Growth in males was positively allometric whereas in females it was isometric. The regressions between total lengths and cephalothorax (Lc) were Log Lc = 1.1118 (Log Lt)- 0.6087 for males and Log Lc = 0.9945 (Log Lt)- 0.4321 for females. The relative growth between these body parts was allometrically positive in males and isometric in females; this result indicates a clear sexual dimorphism. Ovigerous females appeared in the rainy season (July to November). The absolute fecundity ranged from 1 860 to 22 400 eggs in females of 43 to 59 mm in length and 1.9 to 6.0 g in weight. The equations relating the number of eggs to length and weight were Fec = 8.3x10^-7 (Lt)^5.8053 and Fec = 732 (Pt)^1.836 respectively. Rev. Biol. Trop. 56 (2): 513-522. Epub 2008 June 30.

Keywords : Atya margaritacea; Presidio River; allometric growth; sexual dimorphism; fecundity.

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