Ilish Ilish Tenualosa ilisha (ilish, hilsa, hilsa herring "ইলিশ" in Bangla and Australia, or hilsa shad) is a species of fish related to the herring, in the Clupeidae family. It is a very popular and sought-after food fish in the southern region of Asia. It is Bangladesh's national fish. The fish contributes about 12% of the total fish production and about 1.15% of GDP in Bangladesh. On 6 August 2017 Directorate of Patent, Design and Trademark (DPDT) under the Ministry of Industries, Bangladesh has declared the recognition of ilish as the product of Bangladesh. Sixty-five percent of total produced ilish in
Coastal fish fixation, so they are mainly located in sunlit surface waters. Phytoplankton also need and rapidly use nutrients in the water column. The phytoplankton are eaten by zooplankton, which in turn are eaten by predatory zooplankton. Filter feeders then eat the plankton and larger predatory fish eat the filter feeders (see diagram at the right). Most filter-feeding pelagic fish found in coastal waters are small, silvery forage fish. Forage fish include fishes of the family Clupeidae (herrings, shad, sardines and pilchards, hilsa, menhaden and sprats), as well as anchovies, capelin and halfbeaks. They use schooling strategies to avoid predators, and different