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Biological Parameters and Fisheries Indices of Beluga Sturgeon Huso Huso in the Southern Caspian Sea
- Source :
- Croatian Journal of Fisheries, Vol 78, Iss 1, Pp 1-10 (2020)
- Publication Year :
- 2020
- Publisher :
- Walter de Gruyter GmbH, 2020.
-
Abstract
- There is a significant lack of data for the biological parameters of beluga or great sturgeon, the largest fish in the Caspian Sea. The age, growth and fisheries indices for the stock status of beluga was investigated in the south Caspian Basin of Iran between 1990 and 2011. Fork lengths ranged between 113-420 cm and weights from 8.0 to 725.0 kg. The growth parameters were L ∞ = 440 cm, K = 0.027 year−1, t 0 = − 5.8 years. The age at first capture (t c ) was 13.1 years. The long-term age composition data showed age up to 63 years, and the ages 12-19 years comprised 76.7% of the total catch. The generation length was 33 years. The values of “KF” were close to 1 or >1, indicating that beluga sturgeon is in a favorable condition in the southern Caspian Sea. The length distribution showed that 24.2% of the catch is comprised of juveniles. Based on the age structure and age at first maturity, recruitment and growth overfishing occurred in beluga stocks. Therefore, increased length or age at first capture in future fishery policies should be implemented. The mega-spawners represented 4.4% of the fish captured and revealed an unhealthy population structure.
- Subjects :
- life history
0106 biological sciences
Age structure
Population structure
Beluga
Huso
growth parameters
Management, Monitoring, Policy and Law
Aquatic Science
010603 evolutionary biology
01 natural sciences
caspian sea
lcsh:Aquaculture. Fisheries. Angling
Sturgeon
Age composition
Ecology, Evolution, Behavior and Systematics
lcsh:SH1-691
Ecology
biology
Overfishing
great sturgeon
010604 marine biology & hydrobiology
biology.organism_classification
Fishery
Geography
Length distribution
maturity
Subjects
Details
- ISSN :
- 18480586
- Volume :
- 78
- Database :
- OpenAIRE
- Journal :
- Croatian Journal of Fisheries
- Accession number :
- edsair.doi.dedup.....d4573458a4fe2204c3c77b7ac4dcaa4a