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Survey on growth parameters of anchovy kilka (Clupeonella engrauliformis) population in the southern Caspian Sea
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Mehrdad Aliasghari   , Farrokh Parafkandeh Haghighi , Saber Vatandoust , Hamid Ghasemnejhad |
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Abstract: (5482 Views) |
| The aim of the present study is estimation of the growth parameters of anchovy kilka (Clupeonella engrauliformis Svetovidov, 1941) in the southern Caspian Sea. In this study which was conducted during 2010, the samples were provided from Babolsar fishing harbor in Mazandaran province. In the laboratory, the measurements were done and samples were sorted into length and weight size bins. Age was determined using sagitta otoliths. The results were compared with the previous years. The mean length and weight of fish were 116.78±16.5 mm and 12.59±4.2 g, respectively, which has increased in comparison with the previous years. The growth parameters for females were (L∞=138.7mm, k=0.55 yr-1, t0=-0.42 yr) and for males were (L∞=160.5mm, k=0.25yr-1, t0=-0.92yr). Length-weight relationship in females was W=0/00008 FL2/50 (R2=0.902) and in males was W=0/00007 FL2/52 (R2=0.921) which have an allometric growth pattern. Age composition of females was constituted of 6 age groups, including 2-7 years. For males, this was constituted of 7 age groups, including 1-7 years. Mean age of females and males were 4.58±1.43 and 3.86±1.62 years, respectively. In this species population, 4 years old fish were dominant with relative abundance 26.55 percent. Results showed that in recent years, anchovy kilka population has been older and its length and weight has increased. These changes can be due to the weak stock reconstruction process which has affected by invader ctenophore and over-fishing. |
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| Keywords: Clupeonella engrauliformis, Caspian Sea, age, growth |
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Full-Text [PDF 242 kb]
(1608 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2014/01/31 | Accepted: 2014/01/31 | Published: 2014/01/31
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