Abstract
Sardines are the most important commercial fishes for Iran. However, information about biology and ecology of sind sardine in Persian Gulf and Oman Sea is scarce. In this study, relationship between fish length and otolith length, -width and -weight of Sardinella sindensis from Bandar Lengeh and Qeshm Island, Persian Gulf were analyzed. In total, 128 and 120 fishes collected from Commercial catches during March 2011- February 2012 in the Bandar Lengeh and Qeshm Island respectively. There were no significant differences between left and right otolith (t-test, P > 0.05) or between males and females otoliths (ANCOVA, P > 0.05). For these reasons, only right otoliths were used for next analysis and data of both sexes were pooled. Relationships between fish length and otolith length, width and weight were described by linear regression models and high correlation was shown for all relationships. The highest correlation was between fish length and otolith length (Bandar Lengeh, R 2 = 0.8722; Qeshm Island, R 2 = 0.8661) and relationship between fish length and otolith width showed less correlation than other relationships (Bandar Lengeh, R 2 = 0.7355; Qeshm Island, R 2 = 0.7275). The result from this study shows that fish length and otolith growth have a positive relationship, so can be a useful tool to evaluate the growth of fish and fish stocks and finally fisheries management.
Highlights
Sardines are the most important commercial fishes for in North of Persian Gulf (Iran)
All measurement of left and right otoliths were tested and no significant differences were observed between left and right otolith (t-test, P > 0.05) and between otoliths of female and males (ANCOVA, P > 0.05), only right otolith used for analysis and data of both the sexes were pooled
Relationships between fish length and otolith length, -weight and -width were described by regression model and linear equation
Summary
Sardines are the most important commercial fishes for Iran. information about biology and ecology of sind sardine in Persian Gulf and Oman Sea is scarce. The otoliths continue to grow throughout their life and do not resorb in time of stress (Yaremko, 1996; Mendoza, 2006) They are one of the most reliable tools for identification of growth rates, structure of age in a certain. Sardines are small pelagic fishes that live in coastal waters of many sea and ocean. They feed on planktons and are eaten by other fishes, so they are important in marine food web (Emmett et al 2005; Salarpouri et al 2009). The age and growth of S.sindensis was studied using annual rings of otoliths from Persian Gulf and Oman, Iran by Dehghani et al (2015). The relationship between otolith length and fish length can be described by a simple linear regression (Harvey et al 2000)
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