Bangladesh country information

Common names: Ilish, Jatka, ????
Occurrence: native
Salinity: freshwater
Abundance: | Ref:
Importance: commercial | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Hilsa forms a single large inland fishery. Immature hilsa, known as 'jatka', are fished extensively in rivers near Chandpur between February and May. This indiscriminate fishing of 'jatka' is detrimental to the hilsa fishery. Hence, 'jatka' needs to be protected. Large-sized fish mainly contribute to the monsoon fisheries (May to October) and smaller individuals form the fishery during the winter months (November to January). Genetic research (population genetics) for the aquaculture sector is being done in the country (Ref. 55327). Also Ref. 188.
National Checklist:
Country Information: httpss://www.cia.gov/library/publications/resources/the-world-factbook/geos/bg.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: Rahman, A.K.A., 1989
National Database:

Classification / Names

Actinopterygii (ray-finned fishes) > Clupeiformes (Herrings) > Clupeidae (Herrings, shads, sardines, menhadens) > Dorosomatinae
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL

Common names from other countries

Гильза индийская (=тенуалоза индийская), Alose hilsa, Sábalo hilsa, ... more

Main reference

Whitehead, P.J.P. 1985. (Ref. 188)
References | Biblio | Coordinator | Collaborators

Size / Weight / Age

Max length : 60.0 cm SL male/unsexed; (Ref. 188); common length : 36.0 cm SL male/unsexed; (Ref. 4832); common length :42 cm TL (female); max. published weight: 680.00 g (Ref. 4832); max. published weight: 680.00 g

Length at first maturity
L_m 41.5, range 34 - ? cm

Environment

Marine; freshwater; brackish; pelagic-neritic; anadromous (Ref. 51243); depth range ? - 200 m

Climate / Range

Tropical, preferred 27°C (Ref. 107945); 34°N - 5°N, 42°E - 97°E (Ref. 188)

Distribution

Indian Ocean: Persian Gulf eastward to Myanmar, including western and eastern coasts of India. Reported from the Gulf of Tonkin, Viet Nam (Ref. 9706). Reported in Tigris River basin and probably other rivers of southern Iran (Ref. 39702).
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 0; Dorsal soft rays (total): 18-21; Anal spines: 0; Anal soft rays: 18 - 23. Belly with 30 to 33 scutes. Distinct median notch in upper jaw. Gill rakers fine and numerous, about 100 to 250 on lower part of arch. Fins hyaline. A dark blotch behind gill opening, followed by a series of small spots along flank in juveniles. Color in life, silver shot with gold and purple.

Schooling in coastal waters and ascending rivers for as much as 1200 km (usually 50-100 km). Migration though is sometimes restricted by barrages. Hilsa far up the Ganges and other large rivers seem to be permanent river populations. Feeds on plankton, mainly by filtering, but apparently also by grubbing on muddy bottoms. Breeds mainly in rivers during the southwest monsoon (also from January to February to March). Artificial propagation has been partially successful in India (Ref. 4832). Known to be a fast swimmer, covering 71 km in one day (Ref. 12203). Marketed fresh or dried-salted.

IUCN Red List Status (Ref. 115185)

Least Concern (LC)

Threat to humans

Harmless

Human uses

Fisheries: minor commercial; aquaculture: experimental

More information

Countries
FAO areas
Ecosystems
Occurrences
Introductions
Stocks
Ecology
Diet
Food items
Food consumption
Ration

Common names
Synonyms
Metabolism
Predators
Ecotoxicology
Reproduction
Maturity
Spawning
Fecundity
Eggs
Egg development

Age/Size
Growth
Length-weight
Length-length
Length-frequencies
Morphometrics
Morphology
Larvae
Larval dynamics
Recruitment
Abundance

References
Aquaculture
Aquaculture profile
Strains
Genetics
Allele frequencies
Heritability
Diseases
Processing
Mass conversion

Collaborators
Pictures
Stamps, Coins
Sounds
Ciguatera
Speed
Swim. type
Gill area
Otoliths
Brains
Vision

Tools

Special reports

Check for Aquarium maintenance | Check for Species Fact Sheets | Check for Aquaculture Fact Sheets

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Summary page | Point data | Common names | Photos

Internet sources

Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805)
PD₅₀ = 0.5312 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Trophic Level (Ref. 69278)
2.9 ±0.29 se; Based on food items.

Resilience (Ref. 69278)
High, minimum population doubling time less than 15 months (K=0.5-1.2; Fec=220,000)

Vulnerability (Ref. 59153)
Low to moderate vulnerability (31 of 100)

Price category (Ref. 80766)
High

Tenualosa ilisha (Hamilton, 1822)