High stocking density during larviculture and effect of size and diet on production of juvenile Lophiosilurus alexandri Steindachner, 1876 (Siluriformes: Pseudopimelodidae)

作者：Cordeiro N I S; Costa D C; de S e Silva W; Takata R; Miranda Filho K C; Luz R K^*

来源：Journal of Applied Ichthyology, 2016, 32(1): 61-66.

DOI：10.1111/jai.12963

Different stocking densities were investigated in larviculture and feeding of Lophiosilurus alexandri, as well as analyses of the effects on juveniles of two size-classes and two different commercial formulated diets. The first experiment was two-phased: (a) larvae stocked at densities of 60, 120, 180, 240, and 300 larvae L-1 fed with Artemia nauplii and reared for 15days; (b) in phase 2, densities of 5, 10, 15, 30, and 40 juveniles L-1 were evaluated during feed training (20days). Mean water temperature in both phases was 28 degrees C. In the first phase of experiment 1, the different stocking densities did not affect fish growth or survival. In phase 2, growth was similar in all densities; however, survival was lower at higher densities. The increased density provided a rise in biomass and number of individuals produced in both phases. In the second experiment, two size-classes of feed-trained juveniles (30.22 +/- 1.84 and 34.66 +/- 2.41mm) were given pellets of two different diameters (1.2 and 2.6mm) for 20days. The largest juveniles fed the 1.2mm inert diet had higher final weights and lengths. Larviculture and feed training of L.alexandri can thus be performed successfully at high stocking densities of 300 larvae L-1 during the first 15days of feeding, and at densities of up to 40 juveniles L-1 during the 20days of feed training, respectively.

• 出版日期2016-2