Gill net catch counts for Cod and Dolly Varden

Catch information for cod Gadus morhua, which were collected in Kandalaksha Bay, White Sea, Russia, in 2014, and Dolly Varden Salvelinus malma, which were collected in Kronotskoe Lake in Eastern Kamchatka, Russia, in 2013. In both places fish were caught with identical monofilament gill nets of different mesh sizes with a 0.5 hanging ratio. The length of the nets was 30 m for cod and 15 m for Dolly Varden and the height of the nets was 1.5 m in both cases. The duration of the fishing operation was 12 h (from sunset to dawn) for both species and number of fishing operations was 11 for cod and 9 for Dolly Varden. Dolly Varden were caught with gill nets of 22, 25, 30 and 35 mm mesh size (knot to knot) and cod were caught with gill nets of 20, 25 and 30 mm mesh size. The different mesh size nets were set together and were fished concurrently. In both cases nets were set in the afternoon and retrieved the following morning. In total, 694 cod and 783 Dolly Varden were caught.