[Objectives]To evaluate the effects of shell length and shucking of Ruditapes philippinarum on Scylla paramamosain.[Methods]Feeding different-sized mud crabs with shucked or unshelled R.philippinarum of various shell ...[Objectives]To evaluate the effects of shell length and shucking of Ruditapes philippinarum on Scylla paramamosain.[Methods]Feeding different-sized mud crabs with shucked or unshelled R.philippinarum of various shell lengths for 60 d,their growth performance and energy allocation patterns were evaluated.[Results]Survival rates were high across all treatments,with only sporadic mortality observed during the experiment.When fed unshelled clams,the weight gain rate and specific growth rate of smaller crabs were significantly higher than those of larger crabs,showing a clear decreasing trend with increasing initial body mass.Crabs with an initial mass of 3.86 g allocated significantly less energy to growth than those with an initial mass of 49.83 g.Crabs with an initial mass of 49.83 g had a significantly lower proportion of energy lost in molting than those with an initial mass of 260.41 g.Crabs with an initial mass of 3.86 g had a significantly higher proportion of energy lost in feces than those with initial masses of 182.48 and 260.41 g.No significant differences were found in the proportions of energy allocated to nitrogen excretion and metabolic consumption.When crabs within an initial mass range of 202.76-210.25 g were fed with clams of different shell lengths,no significant differences were observed in their growth performance or energy allocation indicators.Feeding shucked versus unshelled clams to crabs of different initial sizes resulted in significant differences in growth performance based on the crab s initial size,but the removal of clam shells had no significant effect.As the initial mass of the crabs increased,the proportion of energy lost through molting increased significantly,while the proportion lost in feces decreased significantly.However,whether the clams were removed or not had no significant impact on the crabs energy allocation indicators.[Conclusions]The initial body mass of the crabs significantly influences growth performance and energy allocation across different treatments,whereas clam shell length and shell removal have minor effects.展开更多
基金Supported by Guangxi Natural Science Foundation(2017GXNSFAA198022)Guangxi Key R&D Program(Guike AB16380105)+1 种基金Open Fund of Guangxi Key Laboratory of Marine Biodiversity Conservation(2023KA01)Doctoral Initiation Funding Project of Guangxi University of Chinese Medicine(2018BS034).
文摘[Objectives]To evaluate the effects of shell length and shucking of Ruditapes philippinarum on Scylla paramamosain.[Methods]Feeding different-sized mud crabs with shucked or unshelled R.philippinarum of various shell lengths for 60 d,their growth performance and energy allocation patterns were evaluated.[Results]Survival rates were high across all treatments,with only sporadic mortality observed during the experiment.When fed unshelled clams,the weight gain rate and specific growth rate of smaller crabs were significantly higher than those of larger crabs,showing a clear decreasing trend with increasing initial body mass.Crabs with an initial mass of 3.86 g allocated significantly less energy to growth than those with an initial mass of 49.83 g.Crabs with an initial mass of 49.83 g had a significantly lower proportion of energy lost in molting than those with an initial mass of 260.41 g.Crabs with an initial mass of 3.86 g had a significantly higher proportion of energy lost in feces than those with initial masses of 182.48 and 260.41 g.No significant differences were found in the proportions of energy allocated to nitrogen excretion and metabolic consumption.When crabs within an initial mass range of 202.76-210.25 g were fed with clams of different shell lengths,no significant differences were observed in their growth performance or energy allocation indicators.Feeding shucked versus unshelled clams to crabs of different initial sizes resulted in significant differences in growth performance based on the crab s initial size,but the removal of clam shells had no significant effect.As the initial mass of the crabs increased,the proportion of energy lost through molting increased significantly,while the proportion lost in feces decreased significantly.However,whether the clams were removed or not had no significant impact on the crabs energy allocation indicators.[Conclusions]The initial body mass of the crabs significantly influences growth performance and energy allocation across different treatments,whereas clam shell length and shell removal have minor effects.
