Fishery science:

abundance alewives anadromous angler annulus aquatic Atlantic Atlantic salmon average bass biological bluegills body length bottom brook trout catch per unit Celluloid cent ctenoid curve deflector depth determining disk Eastern brook trout effect eggs epilimnion estimate factors feet fertilization Fish and Wildlife fish ponds fish populations fishermen fishery fishing effort fishing gear fishway Fraser River gill growth habitat halibut hatchery hypolimnion improvement inches increase lakes largemouth bass limited mackerel marked fish measure mesh method migration natural mortality nets number of fish opercle organisms otter trawl oxygen Pacific period pink salmon plankton plants pollution pools pounds ratio River rotenone Rounsefell salinity samples scale screen season shallow small fish sockeye salmon spawning species stocking stream survival Table temperature tion Trans trap U. S. Fish unit of fishing usually vessels weight Wildl Wildlife Service young