GROUP GROWTH, NATURAL MORTALITY, AGE OF MATURATION, AND COMMERCIAL SIZE OF WHITE AMUR BREAM PARABRAMIS PEKINENSIS (BASILEWSKY, 1855) IN THE AMUR RIVER
Linear and weight growth of amur white bream are considered on the basis of von Bertalanffy and Schmalhausen growth equations using the data collected in the Amur River (from Nizhneleninskoe village to the mouth) in 1958–2011. Age was determined for 1703 specimens (672 females and 699 males, sex not...
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| Format: | Article |
| Language: | Russian |
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Transactions of the Pacific Research Institute of Fisheries and Oceanography
2018-03-01
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| Series: | Известия ТИНРО |
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| Online Access: | https://izvestiya.tinro-center.ru/jour/article/view/360 |
| Summary: | Linear and weight growth of amur white bream are considered on the basis of von Bertalanffy and Schmalhausen growth equations using the data collected in the Amur River (from Nizhneleninskoe village to the mouth) in 1958–2011. Age was determined for 1703 specimens (672 females and 699 males, sex not defined for others). The main feature of the amur white bream growth is a sexual dimorphism, primarily in the specific growth rate. Generally, females live longer than males. Another important feature is a compensatory growth, that maintains the size of all individuals around the mean level in the age of their pubertation. Mean age of females maturation is 5+...6+ years, when their body length is 27 cm on average. Males mature earlier, in the age of 4+...5+ years. Commercial size of amur white bream is determined as 27 cm that corresponds with the size in the age of mass maturation and the highest biomass of females. The minimum natural mortality coefficient (φM) is determined as 0.249 for females and 0.320 for males, on average. The maximum body length of amur white bream, both in the model and real observations, is 50 cm, the maximum body weight is 2 kg, and the maximum age is 17 years. So, the reports about findings of amur white bream with the length up to 55 cm and weight up to 4.1 kg are doubtful. |
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| ISSN: | 1606-9919 2658-5510 |