Ontario, Canada 

 estimates of commercial fish landings for 1967, FFL 

 148 

 Ophichthidae 

 seasonal occurence of young, northwestern Florida es- 

 tuary, S 672 

 Ophichthidae — see also Snake eels 

 Ophidiidae — see Cusk-eels 

 Ophiodon elongatus — see Lingcod 

 Opisthonema oglinum — see Herring, Atlantic thread 

 Orcinus orca — see Whale, killer 

 Orcynopsis unicolor 



eggs and young, S 652 

 Oreaster reticulatus — see Sea star 

 Oregon 



Brownlee Reservoir, FB 67:35, 295, 68:203, 219, 245 

 coastal upwelling indices, 1946-71 



periods of intense winter convergence, S 671 

 coastal waters 

 food of Pacific hake, C 332:35 

 hake fishery, C 332:43 

 Echo, S 608 

 euphausiids, FB 69:79 



fish larvae abundance and distribution, FB 71:697 

 landings 

 annual summary: 1964, CFS 3920; 1965 (4288); 1966 

 (4549); 1967 (4843); 1968 (5149) 

 midwater trawling equipment and fishing technique 



for capturing hake, C 332:77 

 Prescott 

 frequency and duration of flow reversal in lower 



Columbia River, FB 71:312 

 subsurface water temperatures, D 53 

 ratfish collected for study of its biology, FB 70:421 

 sablefish 

 results of comparative trawl and trap fishing, SEP 

 1005 

 scallop explorations, 1963 and 1967, SEP 820 

 Soviet trawl Heet off, C 332:53 

 traveling debris screen, Grande Ronde River, S 645 

 Yaquina Bay, FB 72:201 

 Oregon 



shrimp research aboard, in Gulf of Alaska, SEP 948 

 Oregon — see also Vessels 

 Oregon II 



general description, C 256 

 Oregon II — see also Vessels 

 Organic nitrogen 



Galveston Bay, Texas, S 639 

 Organization for Economic Cooperation and Develop- 

 ment 

 common fisheries policy, 1971, FFL 186-A 

 Osmeridae 

 attempts to rear larvae, S 632 



Osmerus dentex—see Smelt, Arctic 

 Osmerus mordax—see Smelt, American; Smelt, rainbow 

 Ostracion melagris 

 feeding relationships on coral reefs, Kona, Hawaii, FB 

 72:1011 



Otoliths 



age determination, FL 637 

 Otter trawl 

 echo reflector for sonic measuring system, FIR 4:127 

 fishes caught with, near Woods Hole, S 622 

 introduced into Columbia River smelt fishery, SEP 



862 

 North Atlantic fisheries, FL 600 

 sonic system for determining distances, FIR 4:113 

 Oxford, Maryland 

 Bureau of Commercial Fisheries Biological 



Laboratory, C 324 

 first season survival of American oyster, 1961-62, S 567 

 Oxygen 



dissolved in coastal waters of Gulf of Maine, FB 67:117 

 Oxygen concentration 

 at canal stations, Tampa Bay, Florida, Aug. 1970-Aug. 

 1971, FB 71:158 

 Oxyjulis californica — see Senorita 

 Oxyporhamphus micropterus 

 in stomach contents of porpoise and yellowfin tuna, FB 

 71:1077 

 Oyster 

 airlift for harvesting, SEP 724 

 culture in Long Island Sound, 1966-69, SEP 859 

 economic effects of regulations in Maryland fishery 

 closed seasons and closed areas, SEP 845 

 depletion and repletion, SEP 845 

 limitations on technology, SEP 845 

 private leasing, SEP 845 

 regulations, SEP 845 

 tax measures, SEP 845 

 frozen 



historical U.S. statistics, 1945-67, SD 61 

 mortalities, S 569 



opening, using microwave energy, FIR 4:241 

 rearing cultchless hatchery, by reattachment, SEP 935 

 regional patterns of consumption, C 361 

 shucked 



thermal bleaching of red algal pigment, SEP 1099 

 status of culture in Japan, C 388:23 

 tissue 

 rapid method for determining water content, FB 

 65:685 

 United States 

 fishery statistics: 1966, SD 60; 1968 (62); 1969 (63); 



1970 (64) 

 historical statistics, 1880-1965, SD 59 

 Oyster, American 

 anatomy and physiology, C 205 

 comparison of allometric relationships in intertidal 



and subtidal, FB 70:1121 

 effects of pesticides on, FB 67:393 

 enemies, C 205 

 environment, C 205 

 first season survival near Oxford, Maryland. 1961-62, S 



567 

 genetics of, C 388:75 

 growth, C 205 

 history of landings in New York, FB 70:586 



176 



