Abstract
. The use of a large-meshed seine net (aperture 2–5 cm) in enclosed compounds was an effective method for the capture of large grass carp, Ctenopha-ryngodon idella (Val.), and tench, Tinea tinea L., with mean fork lengths of 42–9 cm and 38–3 cm and mean weights of 1–53 kg and 1–10 kg respectively. Calculated population estimates using a constant-effort removal technique showed a high degree of accuracy for grass carp, when the absolute index of population size was checked after completion of netting with an application of a commercially available rotenone formulation. It is suggested that this was so because of the large proportion (>90%) of the total population netted. Large tench may be unsusceptible to rotenone at the low concentration of 0–5 ppm used, so no check on the accuracy of the population estimation was possible.
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