Purse-seine and boat-seine (Thangu vala) fishery forudThe oil sardine off cochin-1968-1971

摘要

The data on the catches, fishing eflFort, length and sex composition relating to theudpurse seine fishery for the oil sardine, Sardinella longiceps V^l. off Cochin, during theudthree seasons from 1968-69 to 1970-71 are presented. A comparison of catch rates ofudthe sardine landed by this gear with those of the boat seine thmgu vala during the sameudperiod has been made. A comparative study of the length range, the modal andudthe mean length distributions of the oil sardine catches obtained in the two gear revealeduda fairly good similarity. Application of Chi-square test on the sex composition data ofudthe sardine shoals fished by purse seine during 1969-71 indicated that there was no significantuddominance of either sex-