<abstract xmlns="http://www.w3.org/1999/xhtml">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 <italic>L</italic><italic>∞</italic> = 440 cm, <italic>K</italic> = 0.027 year−1, <italic>t</italic><italic>0</italic> = − 5.8 years. The age at first capture (<italic>t</italic><italic>c</italic>) 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 “<italic>KF</italic>” 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.</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, t0 = − 5.8 years. The age at first capture (tc) 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.

Biological Parameters and Fisheries Indices of Beluga Sturgeon <italic>Huso Huso</italic> in the Southern Caspian Sea

Croatian Journal of Fisheries

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Biological Parameters and Fisheries Indices of Beluga Sturgeon  in the Southern Caspian Sea

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...

Biological Parameters and Fisheries Indices of Beluga Sturgeon Huso Huso in the Southern Caspian Sea

Published Online: Mar 12, 2020

Page range: 1 - 10

Received: Jul 26, 2019

Accepted: Nov 25, 2019

DOI: https://doi.org/10.2478/cjf-2020-0001

Keywords
Growth parameters, Maturity, Life history, Great sturgeon, Caspian Sea

© 2020 Hasan Fazli et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Biological Parameters and Fisheries Indices of Beluga Sturgeon Huso Huso in the Southern Caspian Sea

Published Online: Mar 12, 2020

Page range: 1 - 10

Received: Jul 26, 2019

Accepted: Nov 25, 2019

DOI: https://doi.org/10.2478/cjf-2020-0001

KeywordsGrowth parameters, Maturity, Life history, Great sturgeon, Caspian Sea

© 2020 Hasan Fazli et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
Growth parameters, Maturity, Life history, Great sturgeon, Caspian Sea