Open AccessMultiple Induced Spawnings of the Indian Catfish Heteropneustes fossilis (Bloch) within a Prolonged Spawning Season
Author(s) -
Alok Deoraj,
Krishnan T.,
Talwar G. P.,
Garg Lalit C.
Publication year - 1998
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/j.1749-7345.1998.tb00985.x
Subject(s) - heteropneustes fossilis , spawn (biology) , catfish , biology , agonist , fishery , zoology , gonadotropin releasing hormone agonist , andrology , fish <actinopterygii> , hormone , endocrinology , anatomy , gonadotropin releasing hormone , receptor , medicine , biochemistry , luteinizing hormone
Singhi, the Indian catfish Heteropneustes fossilis , attained gonadal maturity repeatedly in a single spawning cycle by photothermal treatment. After the first spawning, maintenance at 30 C and 14 h light/10 h dark for 3 wk induced recruitment of the next batch of mature oocytes for subsequent spawnings. The number of eggs released declined with each spawning. However, fertilizability of the eggs was maintained until the fifth spawning. Mature fish were induced to spawn by D‐Lys 6 salmon gonadotropin‐releasing hormone agonist administration. The dose of salmon gonadotropin‐releasing hormone agonist for the second and subsequent spawnings was determined to be 25‐fold less compared to the dose administered for the first spawning. Fish released the maximum number of eggs upon induction when they were maintained continuously at 30 C and 14 h light/10 h dark for 6 wk. The result obtained in the present study points to a possibility of obtaining multiple spawnings from those species of farmed fish which spawn once a year.