علوم زیستی دریا
Shahram Behmanesh; Bagher Amiri Mojazi; Abdolmajid Haji Moradlo; Mahmoud Bahmani; Fereidoon Chakmehdouz Ghasemi; Sohrab Dejandian
Abstract
The ovarian histological characterization of European Catfish on Anzaly lagoon was investigated. 154 female’s specimen in different size were caught by trap, ovarian were fixed in bouin׳s liquid. Samples were fixed, dehydrated, clarified, embedded and stained by H&E method. The tissues were ...
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The ovarian histological characterization of European Catfish on Anzaly lagoon was investigated. 154 female’s specimen in different size were caught by trap, ovarian were fixed in bouin׳s liquid. Samples were fixed, dehydrated, clarified, embedded and stained by H&E method. The tissues were supplied on 0.5µ size and analyzed by light microscope. The ovaries had six maturity stages which were as follow: Immature, Early Developing, Late Developing, Ripe Ovary, Running Ripe Ovary and Spent. Oocyte diameter was measured for 123 female’s specimen in the 2 to 5 maturity stages. In this study, the mean egg diameter, in stage II of gonad maturation was 1/4 mm and gradually increased in the later stages of development, in the fifth stage of the maturation process the average diameter reached to 2/36 mm and again in the sixth stage decreased the oocyte diameter. Also according the present study the type of gonad in this species under the climatic condition of Guilan Province was found on Group Synchronous and spawning in longer period.
علوم زیستی دریا
alireza safahieh; yaqub jaddi; abdol ali movahedinia; ali hallajian; sohrab dajandian
Abstract
The actue toxicity test was performed instatic renewal system based on the standared method Proposed by OECD during 96 h, in which physicochemical parameters of test water including pH, dissolved oxygen and Temprature were daily monitored. to determine the lethal range of diazinon of fish a range finding ...
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The actue toxicity test was performed instatic renewal system based on the standared method Proposed by OECD during 96 h, in which physicochemical parameters of test water including pH, dissolved oxygen and Temprature were daily monitored. to determine the lethal range of diazinon of fish a range finding test was carried out in aquariums coutaing 10 L of test solution. The acute toxicity test was then preformed in 5 treatment in triplicats. The obtained data were analyzed using probit analysis with %5 confidence limit. acording to the results, 24 h LC50, 48 h LC50, 72 h LC50 and 96 h LC50 of diazinon on common seabream was 10/974, 10/391, 9/134 and 7/316 respectively. The Maxium Acceptable Toxicant Concentration (MATC) of diazinon on common seabream was 0/073 mg/l and the Lowest observed effect concentration wich is equal to 96 h LC50 was 2.63 mg/l. The results indicated that compared to other fishes is more resistant against diazinon . in addition diazinon lethal toxicity takes place in a waide range of toxicant concentration.