Seminal features and reproductive index of Thai tilapia (Oreochromis sp.) on different reproductive periods

Rodrigo Diana Navarro,Sonia Maria Batista Alves,Thays Nogueira Lobo Ribeiro Ribeiro

doi:10.4025/actascibiolsci.v43i1.50828

Rodrigo Diana Navarro, Sonia Maria Batista Alves + Show 1 more

Open Access

https://doi.org/10.4025/actascibiolsci.v43i1.50828

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Abstract

Learning about the biology of the species is essential to the success of intensive farming. This study aimed to evaluate the semen of Thai tilapia during the four seasons of the year and thereby analyze their reproductive indices. Thus, 60 breeding males of Tilapia were used and were randomly divided into four water tanks and fed with isoproteic and isocaloric feed. The experiment lasted 12 months, starting from October 2014 and ending on September 2015. Thus, it was possible to collect sperm material of animals during the four seasons, twice a month, as well as to evaluate the water quality parameters in the tanks (temperature, pH and dissolved oxygen). The semen was evaluated from a light microscope in an increase of 100 x, then was activated with water. Motility was measured subjectively in the light microscope, as well as the percentage of sperm showing progressive motility. The duration was evaluated with the addition of a timer. For analysis of the morphology of the semen, the test consisted of morphopathology observation of 100 sperm focused in various fields throughout the slide in the light microscope. Once obtained, these data were analyzed through ANOVA and Tukey test as post-hoc analysis, with the help of the software R Statistics. Water quality factors (temperature, pH and2 dissolved) were acceptable and during the 12 month period the sperm of tilapia (Oreochromis sp.) had a good ability for fertilization, seen that it performed below the average of the percentage of critical abnormalities, and quality was perceived by the parameters that also influence fertilization (motility rate, duration of motility and vigor).

Highlights

The knowledge of the biology of the species, especially in relation to reproductive aspects, is essential when you want to perform the intensive rearing of fish (Andrade & Yasui, 2003; Godinho, 2007).The knowledge of the reproductive performance of these species throughout the breeding period is scarce, proving the need for reflection on the obtaining of such information
This study aimed to evaluate the semen of Thai tilapia during the four seasons of the year and thereby analyze their reproductive indices
The semen was evaluated from a light microscope in an increase of 100 x, was activated with water

Summary

Introduction

The knowledge of the biology of the species, especially in relation to reproductive aspects, is essential when you want to perform the intensive rearing of fish (Andrade & Yasui, 2003; Godinho, 2007).The knowledge of the reproductive performance of these species throughout the breeding period is scarce, proving the need for reflection on the obtaining of such information. It must be considered that climate change is becoming evident every year, and seasons of the year are losing their outstanding characteristics, due to the uncontrolled actions of man over nature, such as the intensification of the greenhouse effect, the deforestation and the destruction of the ozone layer (Walther et al 2002; Pereira, Andrade, Costa, Vidal Jr, & Yasui, 2007). These climatological changes can result in advance or delay in the final maturation or in spawning of these fish in different periods of reproduction. This project aims to evaluate the quality of semen of Tilapia over a year

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