Abstract:

The goby, Pseudapocryptes elongatus, is an amphibious fish and common in the coastal mud flat areas of the Mekong Delta, Vietnam. The fish population was examined to obtain the information required for sustainable use and aquaculture development. Length frequency data of the fish ranging from 9.0 to 24.0 cm total length were analyzed using the FiSAT II software. The parameters of von Bertalanffy growth function fit to the length frequency data were L∞ = 26 cm, K = 0.65 yr-1, and to = - 0.26 yr-1. The longevity (tmax) was 4.35 yrs. There were two recruitment peaks with very different magnitudes and the means of the two peaks were separated by an interval of 5 months. Length at first capture (Lc) was 11.75 cm. The fishing mortality (F = 1.47 yr-1) and natural mortality (M = 1.44 yr-1) accounted for 51 and 59% of the total mortality (Z = 2.91 yr-1), respectively. Relative yield-per-recruit and biomass-per-recruit analyses gave Emax = 0.74, E0.1 = 0.61 and E0.5 = 0.35. The breeding season was extended during the rainy season, with the spawning peaks in July and October. Length at first maturity (Lm) was estimated at 15.4 and 16.3 cm for females and males, respectively. The batch fecundity estimates ranged from 2,652 to 29,406 hydrated oocytes per ovary in the fish specimens ranging from 12.8 to 22.4 cm total length. Results show that the fish stock is subjected to growth overexploitation.

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Date 2007/09/21

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