. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. FORTY-THIRD BIENNIAL REPORT 41 assume a fish diet and there are not enough fish of the right size available in most California lakes. jMost native minnows, because of low productivity or natural and man-made environmental changes, have not been able to support the heavy predation required of a good forage fish, and attention has been directed to exotic species. The principal experimental intro- ductions during the biennium have alread
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. FORTY-THIRD BIENNIAL REPORT 41 assume a fish diet and there are not enough fish of the right size available in most California lakes. jMost native minnows, because of low productivity or natural and man-made environmental changes, have not been able to support the heavy predation required of a good forage fish, and attention has been directed to exotic species. The principal experimental intro- ductions during the biennium have already been de- scribed under "; Lack of success of forage minnows in some water supply reservoirs is being investigated. The role of copper sulfate, a widely used algicide, as a limiting factor is being studied with promising result. Work also was begun to determine harvest rates of black bass. This knowledge is needed to increase understanding of black bass populations under Cali- fornia conditions, and for formulating sensible regula- tions. Tagging studies were begun at Clear Lake, Lake Count\', and on several Southern California reservoirs to discover how many of the bass are being caught each year. Control of rough fish such as carp is the most important management technique now in use. A pro- gram to develop new methods of control was begun. Promising preliminary results were obtained with the use of poisoned bait for partial control of this species. Catfish Study Federal Aid project F-2-R was initiated in January, 1952, when there were indications that the Sacra- mento-San Joaquin Delta white catfish fishery was being depleted. Primary goal of the investigation was to determine the rate of exploitation of the Delta catfish population and the factors affecting its appar- ent depletion. A detailed study of the life history of the catfish was also planned. Knowledge about age and growth, food habits, size and age at maturity, reproductive characteristics,
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