Technology upgradation in tuna fishery, diversification and changing pattern

Tuna and tuna-like fishes are under-exploited resources of Indian EEZ. Exploitation of oceanic tuna and billfishes are possible only by longlining and purse seining. Existing deep sea fishing vessels in India are mostly trawlers equipped for bottom trawling for shrimps and fishes. Most of them are stem trawlers and few are double riggers. Hence the deck layout is not suitable for either longlining or purse seining. Both longlining and purse seining for oceanic tuna and billfishes are specialized techniques which require special onboard facilities, deck layout and deck machineries like line haulers, chute, shooting and hauling accessories for longlining and special powerful purse winch, power block etc. for tuna piu'se seining

A record of an unusually large specimen of Lactarius lactarius (Schneider)

A specimen of Lactarius lactarius (Schneider) measuring 350 mm in total length, the largest to be recorded so far, was caught off Veraval, northwest coast of India. The previous known record was that of a specimen measuring 330 mm in total length from Gulf of Mannar, southeast coast of India (Shanmughavelu 1973)

A new high opening trawl for Veraval waters

The newly developed 25m high opening trawl possesses the properties of a high rising bottom trawl and a semi-pelagic trawl. The new gear is effective for the capture of demersal and semi-pelagic fishes. The net offered more horizontal opening and less resistance with significantly high catch of ribbon fish when compared with bulged belly trawl

Effect of sailkite in improving trawl gear performance

Effectiveness of sailkite has been evaluated in two trawl designs, namely, a 25m high opening trawl and a 32m large mesh demersal trawl, rigged with sailkite through full scale comparative field trials. A 25m high opening trawl showed significant increase in total catch by 54.4% ribbon fish (Trichiurus spp.) alone by 138.3% with a reduction in miscellaneous catch, comprising mostly small sciaenids and juvenile fish, by 13.2% while 32m large mesh demersal trawl showed an improvement in total catch by 9%, ribbon fish by 17.2% and miscellaneous catch by 7.7%. The difference in fishing performance between the two gear arrangements has been attributed to changed net mouth configuration because of higher head line lift and also the possible herding effect on the fish in the vicinity of trawl mouth, due to addition of sailkite

Studies on the effect of colour of webbing on the efficiency of gill nets for hilsa and pomfret off Veraval

Influence of colour of webbing on the catch of gill nets for commercially important hilsa (Hilsa toli and Hilsa ilisha) and pomfret (Pampus argenteus and Parastromateus niger) has been studied in the coastal waters off Veraval. Among the colours tested yellow and white are recommended for hilsa and pomfret gear. Influence of fishing depth, surface water temperature and turbidity on catch are also discussed

Not Available

Not AvailableA specimen of Lactarius lactarius (Schneider) measuring 350 mm in total length, the largest to be recorded so far, was caught off Veraval, northwest coast of India. The previous known record was that of a specimen measuring 330 mm in total length from Gulf of Mannar, southeast coast of India (Shanmughavelu 1973),Not Availabl