Density and gender segregation effects in the culture of the caridean ornamental red cherry shrimp Neocaridina davidi Bouvier, 1904 (Caridea: Atyidae)

摘要

The effect of density on growth, sex ratio, survival, and biochemical composition of the red cherry shrimp, Neocaridina davidi Bouvier, 1904, was studied to determine optimum rearing conditions in this ornamental species. It was tested whether gender segregation affected growth and survival of the species. To test the effect of density (Experiment 1), hatched juvenile shrimp were kept at three different densities: 2.5, 5, and 10 individuals l(-1) (D-2.5, D-5 and D-10, respectively). To test the effect of gender segregation (Experiment 2), 30-day juveniles were reared in three conditions: culture with only females, culture with only males, and mixed culture (females: males 1: 1) at 5 individuals l-1 density. Experiments lasted 90 days, and shrimp were weighted either every 30 days (Experiment 1) or 15 days (Experiment 2). At day 90, females kept at D-2.5 weighted 45% more than females stocked at D-10 (P 0.05), whereas females from D-5 did not differ from those of other densities (P > 0.05). Males at D-2.5 weighted 29% more than D-5 and D-10 (P 0.05). Survival was high and unaffected by treatment. Sexual differentiation did not differ among treatments. Females from D-2.5 had the lowest lipid and protein content, which would occur if they had a higher spawning. Males from D 2.5 had higher content of proteins, probably due to their larger size. Gender segregation had no effect over growth and survival; females grew up to a larger size than males both in monosex and mixed culture. It was shown that given to their non-aggressive behavior, N. davidi is tolerant to a high-density condition, which makes it feasible as an ornamental species.