Abstract
The migratory species piabanha does not reproduce in lentic environments since it requires environmental stimuli for the maturation and extrusion of gametes, and therefore hormonal induction is mandatory. Current study compares the seminal characteristics of Brycon insignis without any hormonal induction (Control - Ctrl) and with two types of hormonal inductors, or rather, carp pituitary extract (T1 - 2.5 mg kg -1 body weight) and GnRH analogues, the latter applied in two different concentrations (T2 - 0.7 mg kg -1 body weight and T3 - 1.4 mg kg -1 body weight). Post-induction analyses showed that the hormones increased the motility rate - Ctrl (95%), T1 (100%), T2 (100%) and T3 (98%), although sperm concentration - Ctrl (11.52 x 10 9 ); T1 (4.37 x 10 9 ); T2 (4.34 x 10 9 ); T3 (4.01 x 10 9 ) decreased. Assessments for sperm vigor, motility time and spermatic morphology did not vary with hormonal induction. Hormonal inducer does not alter negatively the seminal characteristics of the piabanha, and the choice for the proper hormone depends on the preference of the dispenser.
Highlights
The species Brycon insignis, popularly known as piabanha in Brazil (FOWLER, 1951), is one of the most fished species in the country, mainly in the Paraíba do Sul region (MACHADO; ABREU, 1952)
Breeding fish were weighed separately and subdivided into three groups according to hormones and doses: T1 – Carp Pituitary Extract (CPE - 2.5 mg kg-1 body weight); T2 - GnRH analogues (0.7 mg kg-1 body weight) and T3 - GnRH analogues (1.4 mg kg-1 body weight)
The qualitative and quantitative seminal characteristics of each animal were evaluated before and after the administration of hormones, and the control group (Ctrl) was composed of the semen samples taken before hormonal induction
Summary
The species Brycon insignis, popularly known as piabanha in Brazil (FOWLER, 1951), is one of the most fished species in the country, mainly in the Paraíba do Sul region (MACHADO; ABREU, 1952). Highly appreciated for its meat and high market value, the B. insignis is scantily exploited for commercial purposes and is rather found in fish farms for restocking and conservation purposes (SHIMODA et al, 2007) For such purposes, studies on the seminal characteristics of this Brazilian native species are of great importance, especially for the acquisition and improvement of its. Hypophysation is one of the most costly methods of hormonal induction, it is the most used method in Brazil (WOYNAROVICH; HORVÁTH, 1983). Synthetic hormone compounds, such as mammalian GnRH analogues, have been successfully tested to induce fish reproduction (DAS, 2000; 2004; ULIKOWSKI, 2004; KRÓL et al, 2009; TARGOŃSKA; KUCHARCZYK, 2011), and have. Current assay compares the seminal quality of B. insignis before and after induction with hypophysation and GnRH analogues
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