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Induced ovulation of yellow catfish ( Pelteobagrus fulvidraco ) using a combination of a gonadotrop‐releasing hormone analogue and domperidone
Author(s) -
Wang Youji,
Hu Menghong,
Cheung Siu Gin,
Shin Paul K. S.,
Song Limin,
Wang Weimin
Publication year - 2010
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2009.02411.x
Subject(s) - ovulation , catfish , endocrinology , medicine , domperidone , biology , induced ovulation , agonist , carp , hormone , gonadotropin , dopaminergic , dopamine , receptor , fish <actinopterygii> , fishery
The effects of an intraperitoneal hormone injection of gonadotropin‐releasing hormone agonist (D‐Ala 6 , Pro 9 ‐NEt GnRHa) alone or in combination with a dopamine antagonist, domperidone (DOM), on ovulation induction in yellow catfish Pelteobagrus fulvidraco were tested. The hormone treatments were as follows: 6 mg kg −1 body weight (BW) of carp pituitary extract as a positive control, GnRHa 10, 20, 40 and 80 μg kg −1 BW and a combination of GnRHa and DOM as follows: 10 μg+5 mg, 20 μg+10 mg, 40 μg+20 mg and 80 μg+40 mg kg −1 BW. Physiological saline (0.7% NaCl) was used as a negative control. Significant differences in the ovulation ratio, latency period and ovulation index (OI) were observed among treatments ( P <0.05). The combination of GnRHa and DOM at doses of 40 μg+20 mg kg −1 BW had higher values of the ovulation ratio and OI, and a shorter latency period compared with other treatments. The highest OI in GnRHa treatments was only 56.67%, suggesting a dopaminergic tone on gonadotropin secretion in this fish at the pre‐ovulatory stage. Therefore, ovulation can be successfully induced in yellow catfish with 40 μg kg −1 GnRHa+20 mg kg −1 DOM without affecting the egg quality.