Predation of Bidyanus bidyanus (Teraponidae) in ponds by cormorants

Published source details Rowland S.J. (1995) Predation of Bidyanus bidyanus (Teraponidae) in ponds by cormorants. The Progressive Fish-Culturist, 57, 248-249.
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This study is summarised as evidence for the following.

	Action	Category
	Use in-water devices to reduce fish loss from ponds Action Link
	Disturb birds using foot patrols Action Link
	Scare birds from fish farms Action Link

Use in-water devices to reduce fish loss from ponds

A replicated study at four silver perch Bidyanus bidyanus rearing ponds in New South Wales, Australia, found that hanging of gill nets and harassment patrols proved ineffective in deterring cormorants (great Phalacrocorax carbo, little black P. sulcirostris and little pied P. melanoleucos) from fishing in the ponds (Rowland 1995). Gill nets (large diameter mesh enabling young fish to swim through) were hung vertically in the water and harassment patrols (people walking around the ponds) were undertaken. Three ponds of 0.1 ha were stocked with fry (50,000-60,000 fish/ha) and one of 0.3 ha stocked with fingerlings (8,000/ha). Survival rates of fry in the three smaller ponds was 0.3%, 0.8% and 3.5% (average 1.5%), and survival of fingerlings 0.9%.
Disturb birds using foot patrols

A replicated trial in New South Wales, Australia (Rowland 1995), found that hanging gill nets in fish ponds and using harassment patrols to deter cormorants Phalacrocorax spp. from fish farms was not effective. This study is discussed in ‘Use in-water devices to reduce fish loss from ponds’.
Scare birds from fish farms

A replicated trial in New South Wales, Australia (Rowland 1995), found that hanging gill nets in fish ponds and using harassment patrols to deter cormorants Phalacrocorax spp. from fish farms was not effective. This study is discussed in ‘Use in-water devices to reduce fish loss from ponds’.