1887

oa South African Journal of Wildlife Research - 24-month delayed open access - Natural and induced spawning of whitefish Barbus andrewi

Volume 19, Issue 1
  • ISSN : 2410-7220
  • E-ISSN: 2410-8200

 

Abstract

Whitefish, Barbus andrewi, spawned in late November after being stocked into a newly flooded earth pond which received a continuous water flow. Eggs were deposited on a gravel spawning bed located near the inflow. Although 20% of these eggs hatched under hatchery conditions, no larvae emerged from the gravel in the pond. The deposition of a layer of fine silt was probably responsible for this total mortality. In addition, approximately 15 000 viable eggs were obtained from a sexually mature female which spawned naturally in a 400 I holding tank after receiving two pituitary injections. A further ca 3 500 eggs were manually stripped from this female and fertilized. A hatching rate of 60-80% was obtained in the hatchery. Evidence suggesting that whitefish are serial spawners is presented.

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/content/wild/19/1/AJA03794369_3348
1989-01-01
2020-07-15

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