1.Fisheries College,Zhejiang Ocean University,Zhoushan 316004,China;2.The Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China
Abstract: The species composition and amount(expressed by catching rate)of mantis shrimp were evaluated by the data collected in seasonal comprehensive surveys of the marine ecosystem around the Zhoushan Fishing Ground waters(29°30′-32°00′N,127°E)in August,2006 and in January,April,and November,2007.A total of 11 species in 7 genera in 3 families were found with dominant species Oratosquilla oratoria,Lophosquilla costata,and Oratosquilla inornat.The catching of the dominant species accounted for up 97.54%in total catching in summer, 98.75%in spring,99.85%in autumn and 99.35%in winter,indicating that the biomass of the mantis shrimp varied with seasons,expressed as summer＞winter＞autumn＞spring.The higher catch per unit effort(CPUE)was found in the Changjiang estuary fishing ground and the Jiangwai fishing ground in spring and autumn,while the maximal CPUE was observed in the Zhoushan fishing ground in summer and winter.Wholly,the amount of the mantis shrimp was not found just in a few months instead of all year round.
2011, Vol. 26 
