A Biological Study on Reproduction of Sand Gobby (Neogobius pallasi) in Babolrod River , Mazandaran Province

Subject Areas : Breeding and Aquaculture Sciences Journal

Mohammad Gholizadeh ¹ (واحد بابل)
Saber Vatandoust ² (واحد بابل)
Bagher Mojazi Amiri ³ (دانشگاه تهران)

Received: 2017-05-02 Accepted : 2017-05-02 Published : 2017-05-02

Keywords:

Abstract :

This study was carried out to examine reproduction characteristics of Sand Gobby (Neogobius pallasi) from March 2011 to March 2012, in the Babolroud River (Northern Iran) using electro-shocker and 194 specimens were caught. The variables of total length, standard length, body weight, age, gender, gonad’s weight, egg’s diameter, and liver’s weight were measured and recorded. To determine the fish’s age, their scale was used. The total length and weight of males and females were97.75 ± 20.80 (SD) mm and 14.77 ± 10.10  g, and 88.06 ± 12.60 (SD) mm and 10.03 ± 5.05 g respectively. Age readings showed that age composed of five age groups of (0+, 1+, 2+, 3+, 4). + The gender ratio of female to male was 1.15 to 1. The egg’s diameter was ranged  from 0.2 until 2.4 mm. The mean of ova diameters was 1.11 ± 0.28 mm (SD). Absolute fecundity ranged from 400.20 to 1292.80 and mean absolute fecundity was 684.53 ± 2.24. The mean GSI for males and females was  (SD) and 0.33 , 3.06 (SD) respectively. Mean condition factor (CF)  was estimated 1.37 ± 0.14 (SD) for the males and 1.37 ± 0.13 (SD)for the females.The mean of HIS ( hepatic index) was calculate from males and females.