FORTY-FIRST BIENNIAL REPORT 



85 



greater amount of water was rehabilitated. Tlie following waters were 

 treated : 



* One-fourth acre-foot when treated. 



Rock masonry barrier dams were constructed on the outlet streams 

 of Richardson and Miller Lakes, to prevent re-entry of rough fish into 

 the lakes. 



FISH RESCUE 



The rescue of game fish from drying waters and their transfer to 

 safe waters is carried on each year throughout the State. In some areas 

 such work is needed only occasionally, as when a reservoir is drained for 

 repair or examination of the outlet structure at the dam. Unusual or 

 isolated cases of this sort are assigned to crews recruited from one of 

 the hatcheries, or are taken care of by state wardens or sportsmen in 

 cooperation with the Bureau of Fish Conservation. In other areas, how- 

 ever, large-scale fish rescue is required annually and forms a regular 

 part of the program of the Bureau. This is true in some of the steelhead 

 and salmon waters, and here this work has been placed under the super- 

 vision of the biological staff. The fish rescued are tabulated in Appen- 

 dix D. 



FISH INTRODUCTIONS 



If an existing fishery is not producing results commensurate with 

 expectations, there frequently arises a great hue and cry for the intro- 

 duction of some exotic species. Some sad experiences resulting from such 

 introductions many years ago have taught us to exercise extreme caution 

 in making any new ones. It is therefore the policy of the Bureau of Fish 

 Conservation to seek first other means of producing satisfactory angling 

 and to introduce a new kind of fish into a body of water only if the facts 

 indicate that it will fill a previously unoccupied niche in the economy 



