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LARVAL ORGANOGENESIS OF Schizothorax zarudnyi (Nikolskii, 1897) (Cyprinidae): HISTOLOGICAL ASPECTS

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LARVAL ORGANOGENESIS OF Schizothorax zarudnyi (Nikolskii, 1897) (Cyprinidae): HISTOLOGICAL ASPECTS

This study details the histological aspects of development of gills and kidneys in Hamun mahi Schizothorax zarudnyi larvae. It also provides valuable information about its structural status during ontogeny.This information is especially useful in establishing the physiological needs of larvae to ensure optimal growth and welfare.These observations relate to the main developmental stages of Hamun mahi. They are based on external morphological characteristics.At hatching, the larvae have a tubular heart, respiratory anlage and pronephric excretory structure. However, Stage 2 is when the spleen and swim bladder are evident.The first two stages of organogenesis are intense for Hamun mahi larvae, particularly Stage 2.The next stage of development, Stage 2, is not marked by the creation of new structures. Instead, it is marked by the complexity and size of existing structures Video recording systems installed in culture tanks during summer 2006 allowed us to observe the characteristics of spawning.Only the GnRHa hormone-induced groups, which include injection and implantation, showed signs of spawning.In the hormone-manipulated groups, the spawning patterns were observed after 20-24 hours.After 70-72 hours in the hormone injected group, and after 89-90 hours in the hormone implanted group, eggs were collected.The eggs had a mean diameter of 776.75+-1.0 mm in Group 1 (hormone injection) and 753.5+-1.33 mm (hormone implanted).The hormone-induced groups showed significant differences in the total number of fertilized eggs and fertilized eggs (p).

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