New Parameter for Gonad Maturation and New Method for Identification of two Genera of Family Nemipteridae Red Sea
National Institute of Oceanography and Fisheries, Egypt
International Journal of Aquaculture, 2015, Vol. 5, No. 44 doi: 10.5376/ija.2015.05.0044
Received: 28 Dec., 2015 Accepted: 31 Jan., 2016 Published: 03 May, 2016
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Preferred citation for this article:
Elhalfawy M.M., and Ramadan A.M., 2015, New Parameter for Gonad Maturation and New Method for Identification of Two Genera of Family Nemipteridae Collected from Suez Gulf, Red Sea, Egypt, International Journal of Aquaculture, 5(44): 1-6 (doi: 10.5376/ija.2015.05.0044)
Identification of two genera of family nemipteridae, nemipterus and scolopsis in red sea, carried out usually morphologically only but in this study depend on anatomically. For the first time we discovered the presence of an accessory globiform kidney in Nemipterus japonicus. By complete the study on the other species, which obtained in our region from Red sea of family nemiptredae, Nemipterus japonicas, Nemipterus virgatus, Nemipterus zysron and Nemipterus mesoprion. The results indicated that the presence of an accessory globiform kidney in this four species. On the other hand, in Scolopsis ghanam (genus scolopisidsis), this accessory globiform kidney is not present. Therefore, this accessory globiform kidney is specific for genus nemipterus. Besides the above results, there is a new methods used accessory globiform kidney as index to demonstrate spawning season in male of two common species of genus nemipterus N. japonicus and N. virgatus besides other reproductive items, such as gonadosomatic index. This new index called kidnosomatic index (KSI) and used the following equation to calculate (KSI = accessory globiform kidney /gutted weight X 100). The both indices indicated that the spawning season of N. japonicus extend from June to early September but N. virgatus from September to December.
Family nemipteridae; Kidney; Fish identification; KSI; Red sea
International Journal of Aquaculture
• Volume 5