inaotlTe dvirlng the daytime when they rest in shallow water or in rubble 

 on the river bottom, but they start feeding at sunset and remain active 

 until the next morning. There seems to be no gregarious tendency during 

 this active period. Observations of feeding activity indicate that dace 

 are omnivorous* Most feeding takes place on the algal-covered bottom, 

 but drifting food particles and floating insects are also taken. In 

 winter months, dace are seldom seen in the open, although their appearance 

 in fyke-net catches during this period indicates some nocturnal activity. 



The Klamath black dace of Trinity River have been extensively re- 

 ported on by Jhingran (1948)* Much of the dace material collected during 

 this investigation was placed at his disposal and is incorporated in his 

 study. 



Pine-scaled Klamath River suckers are as widely distributed in the 

 river as are the dace, but they are much less abundant. They are most 

 oonmoBly found in deeper holes along the river and in tributaries with 

 moderate gradients. It is common to see large schools feeding along 

 the bottom of pool areas any time of the year. This fish apparently 

 has little value in the Trinity River as a forage fish for large trout. 

 Tbidoubtedly, Juveniles enter the diet of native trout and steelhead, 

 but most small suckers are found in tributary streams where large trout 

 do not occur. 



Resident Game Fishes 



The Trinity River investigation has revealed the presence of three 

 resident Salmonidae: rainbow trout, Salmo gairdnerii (Richardson); 

 brown trout, Salmo trutta (Linnsieus) i and eastern brook trout. Salve linus 

 fonti nails (l(itohill)i named in order of abundance. 



Rainbow trout, the only native species, are distributed in fairly 

 large numbers throughout the drainage, except in the upper extremities 

 of some tributaries. This species contributes the major portion of all 

 game fish taken by sportsmen. The California Division of Fish and Game 

 reports that approximately 7,750 anglers took an estimated 389,900 trout 

 from the Trinity River in 1941. No observations have been made of rainbow 

 trout spawning activities, but ripe males have been taken during the 

 steelhead spawning period (February - April) in Ruoh Creek, a tributary, 

 and it may be assvsaed that they spawn during that period. 



Brown trout ere also generally distrtbuted but are fewer in number 

 flmd more conspicuously absent from the upper extremities of the river and 

 its tributaries than are the rainbow. There are known to be 

 definite spawning migrations of adult brown trout in the Trinity. From 



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