Snapper tagging in North-East New Zealand, 1974: Analysis of methods, return rates, and movements

Abstract

During 1974, 5045 snapper Chrysophrys auratus (Forster) were tagged at various locations along the north-east coast of the North Island. Most were trawl-caught using a canvas cod-end in shallow inshore areas. Four types of tags were used, of which two were found to be effective: a large single-barbed dart tag, and a lock-on spaghetti tag. For the period up to the end of October 1975, 88 (1.74%) were returned. Highest returns were from the Hauraki Gulf (2.3%) and lowest from Northland (nil). Analysis of the recapture data showed that most movements were local, with a mean distance between tagging site and recapture position of 13.9 nautical miles (25.7 km). Four movements greater than 50 miles (92.6 km) were recorded. Local movements in the Hauraki Gulf were associated with the spring/summer spawning period. This movement, out from inshore areas which are closed to seiners and trawlers, and schooling behaviour, are thought to be the main factors contributing to the peak in snapper catches at this time of the year. © 1976 Taylor & Francis Group, LLC.