The karyotype and chromosomal characteristics of the yellowtail king¢sh Seriola lalandi lalandi were investigated by examining metaphase spreads from kidney cells of 4-month-old ¢sh arti¢cially bred using wild-captured broodstock from the coast of South Australia. A total of 80 mitotic metaphases from 10 individual ¢sh were analysed, with 52 spreads having a mode of 2n 5 48 chromosomes, representing 65% of the metaphases observed. The diploid consisted of two metacentric, two submetacentric, six subtelocentric and 38 telocentric chromosomes, with the fundamental number of chromosome arms being 52. The total haploid chromosome length was approximately 44.412 mm. This study shows that the karyotype of S. lalandi lalandi di¡ers from those reported previously for other Seriola species in having one pair of metacentric chromosomes.Karyotype of yellowtail king¢sh X Chai et al.
In order to evaluate the pollution level and risk of total petroleum hydrocarbon (TPH), seawater, sediments, and organisms were sampled from the southern sea area of Zhejiang province (Yangtze River Delta, China) between 2017 and 2019. Petroleum hydrocarbons were widely present in the aquatic environment as well as in products, and their concentrations were highly variable. The average value of PI exceeded 1 from 2017 to 2018, 45.46% to 69.19% samples for seawater and 56.87% to 50.00% samples for sediment were polluted. The results showed significant differences in the TPH concentration in various aquatic organism species. The average TPH value in aquatic organisms order was bivalve>shrimp>crab>fish, further reflecting the ability to accumulate and metabolize TPH exists differently among aquatic organisms within the same culturing pond environment. It is relatively safe to eat aquatic products based on the exposure risk index far below threshold values in this study. Therefore, it will be prudent to undertake regular monitoring of TPH to ensure effective ecosystem functioning as well as seafood safety in Zhejiang southern ocean.
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