Resumen

ALEJO-PLATA, María del Carmen; HERRERA-GALINDO, Jorge Eduardo  y  GOMEZ-MARQUEZ, José Luis. Size, sex and maturity of the squid Lolliguncula diomed eae (Cephalopoda: Loliginidae) in the Gulf of Tehuantepec, México. Cuadernos de Investigación UNED [online]. 2015, vol.7, n.1, pp.79-88. ISSN 1659-4266.

There is practically no information on the biology of Lolliguncula (Loliolopsis) diomedeae. We analyzed specimens caught in four shrimp fishing trips in the Gulf of Tehuantepec in 1999-2001, 2004 and 2006. Sexual maturity and gonadosomatic index (GSI) were used as indica-tors of reproductive activity. A total of 1 200 individuals were captured, 89% female. Females ranged from 35 to 97mm in mantle length (LDM), with a mode at 80mm and weights 2 to 30,9g; males 20,7 to 65mm LDM with a mode at 35-40mm and weights from 0,4 to 12g. Differences in the LDM and the PT between males and females were significant (KS, p<0,05). The sex ratio was 8:1 H:M (p <0,05). The weight-length relation-ship type is potential for both sexes, with a negative allometric growth. 83% of mature females had high IGS values, in contrast to less than 20% of mature males. The size at first maturity (L) indicates that males (42,7mm LDM) mature when shorter than females (74,5mm LDM). Maturity, IGS and oceanographic features of the Gulf of Tehuantepec indicate that L. diomedeae spawn there.

Palabras clave : Squid; shrimp fishing; by catch; Oaxaca.

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