Special Scientific Report: Fisheries, Números 525-540National Marine Fisheries Service, 1965 |
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Página 34
... are aggravated by additions of toxic substances , siltation , and other factors . Water quality has deteriorated past the danger point . Ad- verse physical and chemical changes have modified the biota ; more valuable fish species have 34.
... are aggravated by additions of toxic substances , siltation , and other factors . Water quality has deteriorated past the danger point . Ad- verse physical and chemical changes have modified the biota ; more valuable fish species have 34.
Página 51
... toxic agent . Controlled applications permit destruction of all larval lampreys in a watershed without causing significant harm to other aquatic life . Vernon C. Applegate and John H. Howell METHOD FOR CONTROLLING SEA LAMPREYS ( PETRO ...
... toxic agent . Controlled applications permit destruction of all larval lampreys in a watershed without causing significant harm to other aquatic life . Vernon C. Applegate and John H. Howell METHOD FOR CONTROLLING SEA LAMPREYS ( PETRO ...
Página 52
... toxic agent . Controlled applications permit destruction of all larval lampreys in a watershed without causing significant harm to other aquatic life . Vernon C. Applegate and John H. Howell METHOD FOR CONTROLLING SEA LAMPREYS ( PETRO ...
... toxic agent . Controlled applications permit destruction of all larval lampreys in a watershed without causing significant harm to other aquatic life . Vernon C. Applegate and John H. Howell METHOD FOR CONTROLLING SEA LAMPREYS ( PETRO ...
Página 2
... toxic , if at all . They vary in color from almost transparent , through pale green and yellow , to amber and bright red . Many are luminescent ; some have a definite cuticle ( are armored ) , and many are naked . In some localities the ...
... toxic , if at all . They vary in color from almost transparent , through pale green and yellow , to amber and bright red . Many are luminescent ; some have a definite cuticle ( are armored ) , and many are naked . In some localities the ...
Página 3
... toxic dinoflagellates are not sufficiently dense to cause mortalities , the ingested organisms can render shellfish toxic to humans . The distribution of the naked dinoflagellate , Gymnodinium breve , that causes the Florida red tide is ...
... toxic dinoflagellates are not sufficiently dense to cause mortalities , the ingested organisms can render shellfish toxic to humans . The distribution of the naked dinoflagellate , Gymnodinium breve , that causes the Florida red tide is ...
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Términos y frases comunes
abundance Alaska Amer American shad anchovy larvae Appendix table Atlantic Area Atlantic menhaden August Baja California ber rences taken blooms breve brevis Bull Bureau of Commercial central Baja California Chesapeake Bay coast Commercial Fisheries concentrations cruise dead fish dinoflagellates distribution eggs estimate females FISH AND WILDLIFE Florida fork length frequency fur seals growth Gulf Gymnodinium jack mackerel July June kill Lake Erie lake trout larvae Little Kitoi Lake males migration mortality Number Number Number Number Percent Occur offshore OOSTEN organisms outbreaks Paul Island pelagic Petersen tag phosphorus plankton population Pribilof Islands pups purse seine purse seine catches red tide red-tide River Rock Island Dam Ruth Lake salinity salmon sardine sea lamprey season smolts sockeye spawning Spec species Station lines striped bass surface survival Tampa Bay temperature tion Total Number toxic U.S. Fish Wildl WILDLIFE SERVICE zooplankton
Pasajes populares
Página 73 - UNITED STATES DEPARTMENT OF THE INTERIOR FISH AND WILDLIFE SERVICE UNITED STATES DEPARTMENT OF THE INTERIOR, Fred A.
Página 4 - US DEPARTMENT OF THE INTERIOR, FISH AND WILDLIFE SERVICE, BUREAU OF COMMERCIAL FISHERIES, Washington, DC, June 13, 1962.
Página 1 - EH 1959. Vertical distribution of pelagic fish eggs and larvae off California and Baja California. US Fish Wildl.
Página 10 - Hydr., 36: 57-130. 1941. Age and growth of the rock bass, Ambloplites rupestris (Rafinesque), in Nebish Lake, Wisconsin.
Página 7 - This project covers the expenses of the two American members of the International Board of Inquiry for the Great Lakes Fisheries...
Página 7 - An investigation of the relative efficiencies of natural and artificial propagation of sockeye salmon (Oncorhynchus nerka) at Cultus Lake, British Columbia.
Página 57 - No. 23, 26 pp. 1948. A record of pilchard eggs and larvae collected during surveys made in 1939 to 1941. US Dept.
Página 60 - I would appreciate it. (The information referred to follows :) DEPARTMENT OF THE INTERIOR, FISH AND WILDLIFE SERVICE, BUREAU OF COMMERCIAL FISHERIES, Washington, DC Hon.