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Reproductive Biology of Kingsoldier Bream (Argyrops spinifer) in the Persian Gulf
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Samira Hamzeh1   , Yazdan Keivany1 , Nasrollah Mahboobi Soofiani1 , Khosro Jamshid-Aeen2 |
1- Isfahan University of Technology
2- Iranian Shrimp Institute |
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Abstract: (5194 Views) |
The reproductive characteristics of 639 specimens of kingsoldier bream, Argyrops spinifer, a commercial species of Sparidae family in the Persian Gulf were investigated by monthly sampling during June 2010 to May 2011. Samples were caught by local fisherman using trawl net in waters of Bushehr province. Each month, a total of 50-60 specimens of fish were examined, on average. Total length ranged from 15-61 (24±6.6) cm in males and 13-64 (24.0±7.9) cm in females and total weight ranged 77-3450 (323.6±319) g and 52-4162 (370±465) g in males and females, respectively. Total length (Lm50) and age (Am50) at first maturity were estimated as 30 cm and 5 years for males and 31 cm and 6 years for females, this indicate that A. spinifer is exploited below the mean size at sexual maturity. The overall sex ratio was 1.25F:1M and were significantly different from the expected ratio (p<0.05). The highest value of condition factor was observed in January for females and in February for males. The minimum, maximum and average absolute fecundity were 79000, 2375000 and 683000±528000, respectively for females 17-47 cm total length and weighing 117-1666 g. The relationship between absolute fecundity and fish total length was represented by the following linear equation: F= 54417L–92699 (r= 0.77), and a linear equation: F= 1165W+41595 (r= 0.81) was found between absolute fecundity and fish weight. The analysis of ova diameter for the species revealed that there are three egg batches in ripe ovary of A. spinifer and swing diameter of eggs in the ovaries of these fish throughout the year, was between 25-800 microns. Regarding gonado-somatic index (GSI) values, oocyte diameter, histological studies and abundance of different stages of maturity at different month, it seems that spawning of A. spinifer occurs from December to April. Indeed, gonad maturation started from December and spawning completed in March and April. Long spawning season suggests that A. spinifer is a multiple spawner with an asynchronous ovary. This finding could be confirmed by oocyte diameter and histological studies, too. The results of the present study presume state of both protogyny and rudimentary hermaphroditism in A. spinifer.
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| Keywords: Kingsoldier bream, Argyrops spinifer, Sparidae, Persian Gulf, Reproductive characteristics |
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Full-Text [PDF 1060 kb]
(1871 Downloads)
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Type of Study: Research |
Subject:
بيولوژي آبزيان
Received: 2017/03/8 | Accepted: 2017/10/28 | Published: 2017/10/28
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