Species Migration & Conservation of Hilsa (Tenulosa Ilisha), Ray-Fish Using the Digital Techniques

Abstract

Debabrata Das

Research communication dealt here, a digital application on a species migration & conservation of Hilsa (Tenulosa ilisha), Ray-fish of Ganges and others using the digital technique and described. Application comes in Hilsa, Ray fish and few others are described based on one of the most important water quality parameters, fisheries for migration and conservation. Known that Hilsa has got an immense importance among the fish lovers and to the fish-eating people because of taste and nutrition. Hilsa is one of the most popular among the fishes found in Bay, Estuary or Rivers of Indian Continent. A single matured Hilsa can be weighing around 6 kg. When get matured. Distribution of Hilsa fish are found in Bays, in and around the great Sundarbans and migrates to adjacent waters across the upward of river stretches mainly Ganges, Padma and Godavari rivers while to breed. As like most other fish species this Hilsa species migrates in search of a suitable Total Dissolved Solids (TDS), and in this communication, the study area from coastal Bay of Bengal to the upward fresh-waters of river Ganges. The extent of migration may depend on the fact that till this species gets suitable minimum total dissolved solids on the way to migration while to perform the course of natural breeding. During the breeding period, like every other fish species, this Hilsa fish tries to find a minimum TDS to breed naturally. The threshold value of TDS can easily be detectable computer and electronics devices or simply a TDS meter. This research-study found that a Hilsa fish can breed naturally when the TDS value may become closer to 95-105 ppm, found near up-to the middle stretch of river Ganges regions. Species Hilsa, can migrate mere a 100-300 km or even more in search of mentioned suitable TDS and after the course of natural breeding, the species re-migrate to Bay along with all juveniles unless being caught. For growth and maturity of Hilsa fish like to prefer TDS of a range, 120 to 260 ppm, usually at the Sundarban Estuary and coastal regions of Bay of Bengal

PDF