Open AccessTHE POLYCULTURE OF Penaeus stylirostris STIMPSON AND Penaeus aztecus IN TANKS
Author(s) -
Rubino A. J.,
Lawrence A. L.,
ZeinEldin Z. P.
Publication year - 1983
Publication title -
journal of the world mariculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0735-0147
DOI - 10.1111/j.1749-7345.1983.tb00063.x
Subject(s) - penaeus , biology , polyculture , zoology , hatchery , biomass (ecology) , veterinary medicine , fishery , shrimp , ecology , fish <actinopterygii> , aquaculture , medicine
Penaeus aztecus , obtained from the wild, and hatchery‐reared P. stylirostris were placed together in 65 liter tanks in 5 ratios (0:100, 25: 75, 50:50, 75:25 and 100:0). Two experiments were done. The first experiment consisted of 4 replicates of each ratio at 20°C and 30°C and 2 replicates of each of the 100% tanks at 25°C. Initial size of P. aztecus and P. stylirostris were 0.12 and 0.07 g, respectively. In the second experiment initial sizes of the wild P. aztecus and pond‐reared P. stylirostris were 1.30 and 0.89 g, respectively. The second experiment consisted of 4 replicates of each ratio at 25°C. The mean weight gain, mortality and biomass (actual and that expected on the basis of monoculture) were calculated. In the first experiment, the 50% treatment had the highest mean weight gain for both species, In both experiments, decreasing numbers of P. aztecus (increasing numbers of P. stylirostris ) in a treatment resulted in a better growth of P. aztecus in the treatment. The survival of both species decreased as the percentage of P. aztecus increased. Survival was influenced by temperature, density, and species interactions. The largest difference between actual and expected biomass was found to be for P. aztecus at 30°C, notably in the 75% P. aztecus treatment. P. aztecus does not seem to be influenced by the presence of P. stylirostris as much as P. stylirostris is influenced by P. aztecus in the same tank.