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Chisnall, B.L, 1994. An unexploited mixed species eel stock (Anguilla australis and A. dieffenbachii) in a Waikato pastoral stream, and its modification by fishing pressure. Conservation Advisory Science Notes No. 69, Department of Conservation, Wellington. 9p.
Advice was sought by the Department of Conservation (Hamilton) to answer the following questions:
1. What comprises an unexploited mixed species eel population in a pastoral stream?
2. What are the effects of repeated removal of commercial sized eels on a previously unfished eel population?
A study to validate aging techniques for eels completed for MAF Fisheries in a Waikato lowland pastoral stream (Chisnall & Kalish 1993), has provided information on the structure of an unexploited mixed species eel population (shortfinned eel, Anguilla australis and longfinned eel, A. dieffenbachii ). Most of the resident population was then removed after one year, and for the three following years sampling was carried out to assess the population and to remove marketable sized eels (> 220 g). The data gathered over these five consecutive years (1988-1992) has provided information on the recovery of the eel stock after intensive fishing.
