Most of the consumer advice is provided by environmental non-government organisations. In 2012, Malaysian drift gillnet vessels produced 0.24 million tonnes of GHG emissions, which was 21% of the emissions produced by trawl vessels.In 2010, the 20,000 gillnet vessels operating in Indian waters, but likely not all catching longtail tuna, produced 0.190 million tonnes of GHG emissions, which was 8% of the emissions from Indian trawl vessels. Gillnets used to target larger size tunas can have mesh sizes of about 150 mm.
In addition to canning/fresh, longtail tuna is smoked, and used as sashimi.Longtail tuna is widely used in canned form. Whilst much work has been undertaken to resolve catch reporting issues, much remains to be done to resolve catch by gear type and the markets for the catch.Recreational fishing is growing in countries like India but the recreational tourism companies do not specifically mention longtail tuna as a target species.In Australia, no commercial fishery is permitted to target longtail tuna. The majority of reported longtail tuna landings (99%) are in the coastal waters of the following seven developing countries, namely (in order of 2015 landings), Iran, Indonesia, Pakistan, India, Oman, Malaysia, and Thailand.Longtail tuna is primarily fished using gillnets, purse seines and troll lines. Whilst gill nets can be selective in terms of the size of the fish they catch (the larger the mesh, the larger the fish) they are less discriminating in terms of species caught and can also entangle species other than fish.
Alternatively, longtail tuna may switch to more abundant prey that are tolerant of warmer waters, which may result in increased competition with other predators and a shift in the structure and trophic flows within ecosystems.For descriptions of fisheries for longtail tuna, see For bycatch in longtail tuna gillnet fisheries, see Umair Shahid (2012); Ramūnas Žydelis and colleagues. Although some vessels also produce GHG from refrigeration units, many vessels do not have onboard refrigeration and deliver fish to market on ice, in brine, or salted. In many countries, stringent wastewater management regulations prevent pollution of the environment. Canning facilities in the Middle East, India, Indonesia and Thailand are likely supplied by catches from gillnets and purse seines. A small number of studies have analysed catch data with respect to physical oceanographic features such as temperature, but none have attempted to determine the long-term environmental drivers of longtail tuna productivity. Large volumes of water are required for the processing of tuna for canning; for the fresh market, large volumes of water are used for washing and cleaning, and also for storage, refrigeration and as a transportation medium for fish between handling and processing phases. The ventral surface of the liver lacks striations (as for yellowfin tuna, Body colouration ranges from black on the back to dark blue above the lateral line with an iridescent blue band extending along the lateral line from the top margin of the gills to the caudal keel. The diet composition changes distinctly when fish reach about 100 cm FL, from consuming small schooling fishes and planktonic crustaceans to larger fish such as mackerels, scads, jacks, flyingfishes and needlefishes. Whilst some is caught in directed fisheries, more commonly longtail tuna is taken in fisheries that also target other neritic species such as bullet tunas, kawakawa, bonitos and seerfishes.The status is assigned because longtail tuna is longer lived relative to tuna species of similar size, its restricted distribution, the increasing catches and lack of fisheries data and stock assessments.In recent years, fishing on longtail tuna and other neritic tunas has increased. In the Persian Gulf study the average was 0.4 parts per million.Many vessels that do not have onboard refrigeration deliver their fish to market on ice, in brine, or salted.
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