Power Plants: Effects on Fish and Shellfish Behavior by Charles H. Hocutt

By Charles H. Hocutt

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Everest (1971) found that in some intermittent streams in Oregon, steelhead fry did emigrate downstream at high densities due to aggressive behavior as well as deteriorating environmental conditions. Erman and Leidy (1975) reported that rainbow trout fry in an intermittent stream were able to alter their normal behavior pattern of passive nocturnal drift to allow downstream migration when water levels were adequate. Chum salmon fry actively swim downstream on flood tides to saline waters and actively move upstream on ebb tide to freshwater (Mason 1974).

1966), Clifford (1972), Larimore (1972), Gale and Mohr (1978) and NUS Corp. (1978). The timing of the onset of drift, just after sunset in most instances, would seem to indicate that the observed drift was passive in nature. Pavlov (1970: Jjn Arnold 1974), also reported that drift of roach, bream, perch and other species of larvae was passive and the result of loss of visual reference points at night. The modulated drift pattern is most characteristic of larvae of estuarine-dependent species, but is also exhibited by larvae of neritic marine fishes (Cronin and Mansueti 1971; Pearcy and Richards 1962; Chenoweth 1973; Able 1978; Smith et al.

Fish. S o c , 102(4):816-825. 28 J. R. , AND J. E. EDINGER Wickham, D. , and G. M. Russell. 1974. An evaluation of mid-water artificial structures for attracting coastal pelagic fishes. Fish. , 72(1):181-191. Wickham, D. , J. W. , and L. H. Ogren. 1973. The efficacy of mid-water artificial structures for attracting pelagic sport fish. Trans. Am. Fish. S o c , 102: 563-572. Wilbur, R. L. 1974. Florida's freshwater fish attractions. Fish. , No. 6:18pp. , and T. Mori. 1950. An observation on the habit of bonito, Katsuwonus vagans, and yellowfin, Neothunnus macropterus, schools under the drifting timber on the surface of ocean.

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