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Abstract
The research results determined that the total number of vessels unintentionally capture diamondback squid in the three fisheries: stick held falling net, purpleback squid hand line and ocean tuna hand line is 3,697; Basic parameters of fishing gear are as follows: main line length from 120 - 160m, branch line length from 5 - 6m, number of hooks from 1 - 2 hooks/branch, each branch line is equipped with 01 blue or seven-color wireless LED light; fishing grounds often encounter diamondback squid from 10 - 18 degrees North latitude and from 110 - 118 degrees East longitude, especially the area around Hoang Sa and Truong Sa archipelagos; diamondback squid fishing season achieves high productivity from February to July of the solar calendar, in which the time with the highest productivity is from March to May; fishing productivity of stick held falling net, ocean tuna hand line and purpleback squid hand line is 2.5 kg/day/vessel, 2.3 kg/day/vessel and 1.9 kg/day/vessel respectively; revenue from diamondback squid of purpleback squid hand line is about 30.24 million VND/ship/year, ocean tuna hand line is about 15.15 million VND/ship/year and stick held falling net is 12.61 million VND/ship/year; diamondback squid after being brought onto the ship is usually processed by removing the internal organs (for squid >1 kg/ squid) or leaving the squid whole (for squid <1 kg/ squid) then put in a sealed plastic bag or dried and preserved with ice; diamondback squid is consumed domestically and initially exported to China (through unofficial channels) and Korea.
Keywords: Diamondback squid, stick held falling net, purpleback squid handline, tuna handline, fishing, preservation