Journal of Animal Diversity
مجله تنوع جانوری
JAD
Basic Sciences
http://jad.lu.ac.ir
1
admin
2676-685X
2676-685X
10.61186/JAD
en
jalali
1399
3
1
gregorian
2020
6
1
2
2
online
1
fulltext
en
Length-weight, length-length relationships and condition factor of Rutilus kutum (Actinopterygii: Cyprinidae) from the southern Caspian Sea, Iran
Ecological Diversity
مقاله پژوهشی اصلی
Original Research Article
<div style="text-align: justify;"><span style="color:#000000;"><span style="font-size:14px;">Fish stock assessment in the Caspian Sea requires employing some growth indicators such as length-weight relationship (LWR). Size determination in fish is more biologically relevant than age, because several ecological and physiological indicators are more size-dependent compared to age-dependent. This study aims to examine the length-weight relationship and condition factor of <em>Rutilus </em><em>kutum</em> (Kamensky) from the southern Caspian Sea. 218 fish samples were caught using a gill net from Anzali, Astara, Kiashahr, Sari and Torkaman Port from September 2018 to February 2019. Negative allometric growth patterns were observed in Sari and Torkaman Port and positive allometric growth patterns were found in Anzali, Kiashahr and Astara stations. The fish caught from Anzali displayed the maximum condition factor. LWRs are not continuous over the year and LWR indices may vary significantly due to biological, food availability, temporal and sampling factors, and also by fish health and sex. Relative weights in fisheries studies can be used for comparing condition across different populations and species. Investigations carried out indicate that growth of <em>R. kutum</em> in recent years has decreased.</span></span></div>
North of Iran, gill net, stock assessment, allometric, Kutum
56
61
http://jad.lu.ac.ir/browse.php?a_code=A-10-96-2&slc_lang=en&sid=1
Mohammad
Forouhar Vajargah
mohammad.forouhar@yahoo.com
1003194753284600759
1003194753284600759
Yes
Department of Fisheries, Faculty of Natural Resources, Sowmehsara, Guilan University, Guilan, Iran
Masoud
Sattari
msattari647@gmail.com
1003194753284600760
1003194753284600760
No
Department of Fisheries, Faculty of Natural Resources, Sowmehsara, Guilan University, Guilan, Iran
Javid
Imanpour Namin
1003194753284600761
1003194753284600761
No
Department of Fisheries, Faculty of Natural Resources, Sowmehsara, Guilan University, Guilan, Iran
Mehdi
Bibak
1003194753284600762
1003194753284600762
No
Department of Fisheries, Faculty of Natural Resources, Sowmehsara, Guilan University, Guilan, Iran