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Colima, Mexico

Sarabia-Mendez M.,National Autonomous University of Mexico | Gallardo-Cabello M.,National Autonomous University of Mexico | Espino-Barr E.,CRIP Manzanillo | Anislado-Tolentino V.,University of the Sea

Analysis of scales of Lutjanus guttatus (Steindachner, 1869) allowed the identification of three growth rings. Similar data were obtained with kernel density method. Values of the von Bertalanffy's growth equation are: L ∞ = 96.60 cm, W∞ = 7,508 g, K = 0.22 years-1 and to = -0.10 years. Maximum values of the condition factor occur during February and June and were preceded by two months of high values of the gastric repletion index. Maximum reproductive period was during April and August. Recruitment periods were from November to January and April to June. The recruitment length is 16 cm. The highest values of the hepatosomatic index are during December to June and showed an inversely proportional relation to the gonadosomatic index. First sexual maturity length is 30.63 cm and its longevity of 13.5 years. Forty one percent of L. guttatus individuals captured in Bufadero Bay are sexually immature, therefore we suggest a minimum capture size of 45 cm (age 2.5 years) and a closed season from August to September. Source

The natural mortality (M) of the red sea urchin (Strongylocentrotus franciscanus) on the northwestern coast of Baja California between 1985 and 2007 was of 0.251 ± 0.008 (mean ± standard deviation); these values were calculated with the Pauly (1983) method, based upon growth parameters and the habitat temperature (Th). Growth parameters were taken from literature and the temperature was measured in situ (Th) and with satellite sensors (Th'). The variations of M were related to El Niño and La Niña events; another authors' results suggest that these events affect metabolism and morbidity of red sea urchins as well as the availability of food to animals of all ages. Source

Espino-Barr E.,CRIP Manzanillo | Gallardo-Cabello M.,National Autonomous University of Mexico | Granados-Flores K.,National Autonomous University of Mexico | Cabral-Solis E.G.,CRIP Manzanillo | And 2 more authors.
Journal of Fisheries and Aquatic Science

Thirteen age groups were identified for Microlepidotus brevipinnis (Pisces: Haemulidae). Otoliths sagittae gave a better fit between observed and calculated data than scales, but both methods are considered valid for age determination. The constants of Von Bertalanffy's growth equation calculated through sagittae analysis were: L∞ = 388.68 mm, W∞ = 829.741 g, K = 0.207, to = -0.718 and A0.95 = 14 years. Differences in growth between sexes were found; females show higher values of L∞ and longevity than males. Microlepidotus brevipinnis reaches its sexual maturity at age four. The gonadosomatic index presented higher values during December and March. The periods of more intensive feeding and fatty acids accumulation in liver are from May to October. With other researcher data, growth parameters of species from the same family were calculated in order to compare them with the one obtained in the present study. Microlepidotus brevipinnis has an intermediate size among other species of the same family. © 2010 Academic Journals Inc. Source

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