بررسي و مقايسه خصوصيات ريخت سنجي و شمارشي ماهي گوازيم دم‌رشته‌اي (Nemipterus japonicus (Bloch,1791)) در سواحل جزيره خارك و بوشهر

Study & Comparison of morphometric and meristic characters of the Nemipterus japonicus in litoral zone of Bushehr and Khark island

در اين پژوهش خصوصيات ريخت سنجي (مورفومتريك) و شمارشي (مريستيك) ماهي گوازيم دم‌رشته‌اي (Nemipterus japonicus) سواحل خليج‌فارس(جزيره خارك و بوشهر) مورد مطالعه قرار گرفت كه با صيد 714 نمونه ماهي طي مدت 13 ماه از آذرماه 1388 تا آذرماه 1389 به وسيله تور گوشگير(چشمه25و35 ميليمتر) به اجرا در آمد. براي اين منظور 27 مشخصه مورفومتريك، 8 مشخصه مريستيك و 25 مشخصه نسبي اين ماهي مورد بررسي واقع گرديد. اطلاعات حاصله در نرم افزارهاي آماري همچون systat9.0 و Excel مورد تجزيه و تحليل قرار گرفتند كه طبق نتايج حاصله دامنه طولي ماهيان ماده بين520/194 تا520/356 ميلي متر و دامنه وزني آنها بين 900/46 تا200/305 گرم و در ماهيان نر دامنه طولي بين 520/190 تا520/335 ميلي متر و دامنه وزني آنها بين 500/46 تا800/340 گرم مي‌باشد. بيشترين فراواني گروه هاي طولي 250 تا 280 ميليمتر برآورد گرديد و نسبت جنسي نر به ماده نيز 1: 17/2 بود.

This Study was done in order to evaluate the effect of dietary prebiotic yeast cell wall (Saccharomyces cerevisiae) so called (YCW) on growth indices of Acipenser nudiventris fingerlings. 240 cultural ship fingerlings weighted average number (± SD) 7.61 ± 0.01 g for 8 weeks were fed by four different diets including 0, 0.5, 1 and 1.5% YCW in basal diet in form of 4 treatments (following control, 1, 2 and 3). The treatments in twelve 500L fiberglass tank with density of 20 fish in each tank, in the form of 4 treatments with 3 replicates were randomly distributed. The results showed that growth indices such as final weight, specific growth rate, average daily growth, feed convertion ratio in all treatments had no statisical significant differences in compared with the control (P > 0.05). Hepatosomatic index in treatments fed by YCW was significantly higher than control (P?0.05). Condition factor only in treatment 2 was significantly higher than control. Survival rate in all treatments was significantly higher than control. The experiment indicated that YCW didn’t influence on growth indices highly in Acipenser nudiventris.