Individual study: Floating ropes are effective in reducing double-crested cormorant Phalacrocorax auritus numbers at a channel catfish Ictalurus punctatus raising facility on Snake Creek, Mississippi, USA
Mott D.F., Flynt R.D. & King J.O. (1995) An evaluation of floating ropes for reducing cormorant damage at catfish ponds. Proceedings of the Eastern Wildlife Damage Control Conference, 6, 93-97
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Use in-water devices to reduce fish loss from ponds
A before-and-after study at a channel catfish Ictalurus punctatus farm in Mississippi, USA, in January-April 1992 (Mott et al. 1995) found a 95% reduction in double-crested cormorant Phalacrocorax auritus on two ponds following the installation of parallel lengths of 9.5 mm yellow polyethylene rope with foam floats, 6.1 m apart (0.8-2.2 birds/min/day before installation vs. 0.03-0.08 afterwards). Eleven helium balloons also appeared useful in frightening cormorants habituated to ropes. During the week prior to addition 0.29 cormorants/min/day entered, whereas in the week after 0.02 entered. A 4.6 ha pond was monitored for 1,019 minutes before rope installation and 2,418 minutes after.