The temporal characteristic of plankton community and their relationship with shrimp growth in the co-cultural farming of rice and redclaw crayfish(Cherax quadricarinatus)
In this study,the temporal characteristics and biodiversity of plankton community from June to September 2022 were examined by high-throughput 18S rRNA gene sequencing in 6 co-cultural systems of rice and redclaw cray-fish(Cherax quadricarinatus)in Haining City,Zhejiang Province.Further,the relationship between dominant spe-cies/diversity indices and growth traits was analyzed by Pearson's correlation coefficient and exhibited the results with a heatmap.Results showed that no significant difference was found in growth traits including body length,carapace width,final body weight,growth rate,specific growth rate and condition factor of C.quadricarinatus among different co-cultural systems.However,the body length,carapace width and final body weight were gradually increasing while specific growth rate was decreasing with the extension of co-cultural time.The biodiversity of plankton community was initially improved by the introduction of C.quadricarinatus but was negatively influenced by its culturing succession.Cryptomonas,Chlamydomonas,Chlorella and Mesocyclops were the dominant species in the co-cultural systems of rice and redclaw crayfish.The relative abundance of the main species(top 50 species of plankton)belonging to phy-toplankton and zooplankton exhibited a conflicting variation,with an upward tendency in phytoplankton while a down-ward tendency in zooplankton.The plankton community could be classified into four types according to the sampling period,indicating that seasonal variation was the main factor driving changes in the plankton community.Moreover,the predation of C.quadricarinatus was also related with the change of plankton community.The condition factor was negatively correlated with Chlorella,indicating that water quality played a significant impact on the growth and health condition of C.quadricarinatus.Thus,it is important to balance the substantial demand of nutrition in paddy and good water quality in the aquaculture areas in co-cultural farming of rice and redclaw crayfish.
plankton communityco-cultural farming of rice and aquacultural animalCherax quadricarinatushigh-throughput DNA sequencingbiodiversity
NETL
NSTL
万方数据
