ANALYSIS OF GONADAL DEVELOPMENT, BY BLOOD AND HISTOLOGICAL TESTS IN WILD ORGANISMS OF RED SNAPPER Lutjanus colorado ON THE NORTH COAST OF THE MEXICAN PACIFIC

1Apolinar Santamaria-Miranda, 1Jesús. F. Escarrega Román, 1Juan Pablo Apún-Molina, 2Urfila Pelaez-Estrada.
asantama@ipn.mx
1Instituto Politécnico Nacional, Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional. Unidad Sinaloa. Blvd. Juan de Dios Bátiz Paredes #250. Guasave, Sinaloa 81101.
2Instituto Tecnológico de Pinotepa Av. Tecnológico S/N Col. Dispensario C.P. 71600 Santiago Pinotepa Nacional, Oax, Mx. Tels. (954) 54 3 5287.
 

In the north of the Sinaloa coast, the red snapper, Lutjanus colorado, is considered one of the most important fish species because of its commercial and nutritional value. 206 organisms were stacked during the four seasons (winter, spring, summer and autumn) of 2016, from the Sinaloa coast, the blood samples of 1.5 ml were extracted from each fish. The following biochemical parameters in blood were analyzed: protein (PT), cholesterol (COL), triglycerides (TRG), glucose (GLU), vitellogenins, and hematocrit. Red cell (RBC), white cell (WBC) and thrombocyte (TBC) were estimated. Also, the gastric repletion index (GI), gonadosomatic index (GI), hepatic index, and condition factor (K) were obtained. The values of blood samples from wild red snapper were correlated with fish size and season. Fish body weight and total length (LT) ranged from 81.3 to 2,040 g, and from 17.5 to 52.7 cm, respectively. The IRG (3.16 ± 0.25) and K (1.27 ± 0.01 %) indexes were higher in summer, whereas the higher GI and HI values were obtained in autumn, with averages of 0.11 ± 0.01 and 1.8 ± 0.12 %, respectively. For PT and COL, the higher concentrations were observed in autumn, with averages of 7.54 ± 0.44 g/dL and 166.60 ± 7.8 mg/dL, respectively, whereas the higher values of TRIG and GLU were obtained in summer and spring, with averages of 185.23 ± 10.8 and 46.56 ± 2.23 mg/dL, resp. For HTO and RBC the higher values were observed in summer, with averages of 43.10 ± 0.98 % and 2.68 ± 0.04 x106 células μl⁻1, while WBC and TBC in winter and fall were higher, with averages of 8.08 ± 0.69 x103 and 32.17 ± 1.08 x103 células μl⁻1. The highest value of vitellogenin per season was obtained in spring (121.22 ± 16.95 μg / ml). In relation to the determination found in organisms of 25 cm (116.72 ± 29.37 μg / ml) and with respect to the weight found in organisms of 587 g (101.40 ± 16.30 μg / ml). The obtained results contribute to better understand on the reproductive physiology of the red snapper from the wild, and the development of its culture in captivity.