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ORINOQUIA

On-line version ISSN 0121-3709

Abstract

AJIACO-MARTINEZ, Rosa E; RAMIREZ-GIL, Hernando  and  ARIAS -CASTELLANOS, José A. Fisheries aspects and reproductive biology of Hemiancistrus guahiborum, in a scree in the Bita river, Puerto Carreño - Colombia. Orinoquia [online]. 2012, vol.16, n.2, pp.40-51. ISSN 0121-3709.

In the scree El Alizal of the Bita river, Puerto Carreño, Vichada, was studied fisherie and reproductive biology of the species Hemiancistrus guahiborum. The fisheries economic unit (FEU) and the parameters of effort and fishing were calculated. Likewise, the fish density in the scree and its distribution pattern were determined using the grid method. By observing the gender and gonadal mature status of monthly caught samples, the breeding season was determined and the total condition factor (K) and the somatic condition factor (K'), the gonadosomatic index, the absolute fecundity (F) and relative fecundity at weight and the mean size of sexual maturity (L50%) were calculated. The FEU was composed by a fisherman and its mask, who using lung freediving, captured 28 ± 18 individuals / fishing,in fishing tasks that lasted 52 ± 20 min. The mean density in the scree river was 0.06 individuals /m2 with a relation variance /mean of 8.86. Mature individuals were observed in all sampled months. Not significant variation in the condition factor (K and K') either gonadosomatic index between months was observed. The F was established in 48 ± 19 oocytes and the relative fecundity was 5.3 ± 0.3 oocytes / g. The maturity size L50% was determined in 6.4 cm and 7.5 cm standard length for females and males, respectively. Parental care in nest was observed in the males. As management strategies are suggested the follows: keep the period of current fishing ban, establish the fishing size in 6 cm SL, ban the trade of mature females, establish breeding areas in the scree rotate the fishing in the scree river and stimulate the captive breeding of the species.

Keywords : condition factor; density; fecundity; fishing economic unit; mean size of maturity; red cucha.

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