Hormone-induced spawning and gonadosomatic index of brackishwater silver therapon (Leiopotherapon plumbeus kner 1864)

Abstract

© Rushing Water Publishers Ltd. 2019. This study presents data on the induced spawning trials of brackishwater Leiopotherapon plumbeus (Kner 1864). Broodstock (14.11 ± 1.05 g males, 15.85 ± 2.05 g females at a sex ratio of 1 male: 1 female) were injected with 4 IU hCG g-1 body weight and held in 20-L spawning aquaria. Water temperature in the tanks was 27.20–28.30°C. Females from five out of nine pairs were spawned, with estimated fertilized eggs of approximately 5,000 to 6,500 adhesive eggs per female. Spawning time was observed to be from 18 to 24 h after injection. Fertilization rate varied from 75.0 to 91.11%, whilst hatching rate ranged from 94.44 to 100%. Mean gonadosomatic index of unspawned specimens ranged from 3.94 to 9.27% (mean = 7.22 ± 2.54%). Fertilized eggs were relatively adhesive and had a mean diameter of 0.98 ± 0.09 mm. Hatching occurred from 20–28 h post fertilization, producing yolksac larvae with a total length of 1.19–2.34 mm (mean = 1.98 mm). The larvae have large elliptical yolk, comprising about 39–42% of the larvae’s total length. Yolk was completely absorbed in most specimens after day-3 post-hatching. The average GSI of unspawned specimens was 7.22 ± 2.54% (range: 3.94 – 9.27%).

Source or Periodical Title

Asia Life Sciences

ISSN

1173375

Page

387-397

Document Type

Article

Subject

Ayungin, Bataan, Gonadosomatic index, Human chorionic gonadotropin, Leiopotherapon plumbeus, Silver therapon

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