Spawning of farmed lane snapper, Lutjanus synagris (Linnaeus, 1758), in response to hormonal induction

Authors

  • Rossi Lelis Muniz Souza Pesquisador do Centro de Estudos em Aquicultura Costeira - CEAC/Instituto de Ciências do Mar – LABOMAR/Universidade Federal do Ceará.
  • Mayra Bezerra Vettorazzi Pesquisador do Centro de Estudos em Aquicultura Costeira - CEAC/Instituto de Ciências do Mar – LABOMAR/Universidade Federal do Ceará.
  • Roberto Kiyoshi Kobayashi Pesquisador do Centro de Estudos em Aquicultura Costeira - CEAC/Instituto de Ciências do Mar – LABOMAR/Universidade Federal do Ceará.
  • Manuel Antonio de Andrade Furtado Neto Professor Associado do Departamento de Engenharia de Pesca/Centro de Ciências Agrárias/Universidade Federal do Ceará.

DOI:

https://doi.org/10.32360/acmar.v49i2.6582

Keywords:

Lutjanus synagris, spawning, hormonal induction, hCG, fish farming.

Abstract

The aim of this study was to perform the hormonal induced spawning of the lane snapper, Lutjanus synagris, using human Chorionic Gonadotropin (hCG) as hormonal treatment. There was made use of 72 specimens, being 24 females and 48 males, with average weights of 0.381±0.154 kg and 0.353±0.105 kg, respectively, in three treatments with eight replicates. Females in Treatment 1 (T1) received a total dose of 1.000 IU hCG/Kg of body weight, and those in T2 and T3 received a total dose of 1.250 and 1.500 UI hCG/Kg of body weight, respectively. Spawnings occurred between eight and twelve hours after the hormonal treatment, and the fertilized eggs presented spherical shape, transparency, narrow perivitelline space, clear chorion, homogeneous and non-segmented yolk, visible oil drop as well as no pigmentation and buoyant features. The average non-fertilized egg, fertilized egg and oil drop diameters values were T1: 425±16, 659±10 e 139±2 µm; T2: 427±15, 661±14 e 140±5 µm; T3 422±10, 667±20 e 141±5 µm, respectively. The number of released oocytes varied from a minimum value of 405.797±230.812 eggs (T2) to a maximum value of 556.661±209.171 eggs (T!). The highest fertilization rate was observed in T1 with 75±10%, followed by T2 and T3 with 66±7% and 65±17%, respectively.

Published

2017-05-05

Issue

Section

Artigos originais