عنوان مقاله [English]
The performance of Pacific white shrimp broodstocks is affected by several factors including different environmental conditions, feeding type, size, and the cultivation site. In the present study, two different reproduction systems were used to investigate the reproductive performance of Pacific white shrimp broodstocks: conventional (water exchange) and limited water exchange Female broodstocks having an average weight of 38.6 ± 6.8g were obtained from Chabahar Reproduction Center located in Konarak and experimented in 2000-liter tanks. Two treatments in three replications in a completely randomized design were considered for the current research, including: control group (conventional rearing system) in which 90% of the water was replaced and limited water exchange treatment in which 2 to 3% of the water was exchanged daily. The results of this study showed no significant difference in the growth performance of broodstocks between two cultivation systems (p > 0.05), but the survival rate in the limited water exchange system were measured higher (97.57%). Moreover, the number of eggs in each spawning stage for shrimps under conventional farming system and limited water exchange 47,500 and 60,800 were obtained, respectively, a significant difference (p < 0.05). Furthermore, the number of shrimp eggs in each spawning stage varied significantly in the conventional system and in the limited water exchange treatment, with 49,300 and 60,800 eggs, respectively (p <0.05). A higher number of eggs converted to nauplius by the limited water exchange system than by the conventional system. In general, this study found that the reproductive performance of Pacific white shrimp broodstocks in the system with limited exchange of water is better than the conventional system.