Download or read book Temperature and Food Effects on Larval Pacific Herring Clupea Pallasi in Prince William Sound Alaska written by Sarah Jane Thornton and published by . This book was released on 2003 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The effects of food availability and water temperature on larval Pacific herring growth rates and survival were studied using a coupled biophysical model for 1993 through 1997. The herring growth model included feeding gains, metabolic costs, mortality losses and vertical migration of the herring larvae. In years when springtime oceanographic processes resulted in a high concentration of zooplankton, food availability did not limit larval herring growth rates; water temperature determined survival. However, in other years, food availability did limit survival, either due to insufficient food concentrations or to inaccessibility of the food. Vertical migration occasionally was restricted by strong water column stratification, which prevented the larvae from reaching food concentrations sufficient for growth. Thus the amount of food, the temperature, and the vertical distribution of the food and the larvae were found to affect growth. The study of vertical properties of factors affecting larval fish must be included in larval fish research"--Leaf iii.

Download or read book Contribution to the Biology of the Pacific Herring Clupea Pallasii and the Condition of the Fishery in Alaska written by George Armytage Rounsefell and published by . This book was released on 1930 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Habitat Use of Pacific Herring Clupea Pallasii in Prince William Sound Alaska written by Seanbob R. Kelly and published by . This book was released on 2007 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: "To determine the spawning area contributions of Pacific herring (Clupea pallashii) larvae to nursery bays, otolith chemical analysis was conducted on juvenile fish collected from 1995 to 1997 in Prince William Sound, Alaska. The otolith edge, representing the chemical signature of the known capture location, and the otolith core, representing the unknown spawning ground chemistry, were compared with discriminant function analysis to infer spawning area origin. Chemical signatures of 87Sr/86Sr ,88Sr/48Ca, 24Mg/48Ca, and 138Ba/48Ca were used to identify broad spawning regions from inner and outer PWS that persisted for the three years sampling period despite significant interannual variability in otolith edge chemistry within nursery bays. Age of juvenile Pacific herring, age-0, 1, 2, did not significantly affect the otolith edge signatures; thus, this study is able to conclude from the otolith core chemistry that spawning areas do not contribute equally to nursery bays. This is the first demonstration that otolith chemical signatures can be used to identify the important spawning areas of this commercially important species in the Gulf of Alaska coastal areas"--Leaf iii.

Download or read book Reproductive Success of Pacific Herring Clupea Pallasi in Prince William Sound Alaska Six Years After the Exxon Valdez Oil Spill written by Scott W. Johnson and published by . This book was released on 1996 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Juvenile Pacific Herring Clupea Pallasi Feeding Ecology in Prince William Sound Alaska written by Robert James Foy and published by . This book was released on 2000 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Age Composition Weight Length and Sex of Herring Clupea Pallasii Used for Reduction in Alaska 1929 66 written by Gerald M. Reid and published by . This book was released on 1971 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Alaska s Fisheries Resources written by and published by . This book was released on 196? with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 1999 with total page 860 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Diet and Ration on the Growth and Survival of Pacific Herring Clupea Harengus Pallasi Larvae written by C. W. Haegele and published by 1978. This book was released on 1978 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies on Pacific Herring Clupea Pallasi Spawning in Prince William Sound Following the 1989 Exxon Valdez Oil Spill 1989 1992 written by Evelyn Dale Biggs and published by . This book was released on 1997 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oceanic Abstracts written by and published by . This book was released on 1997-04 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Health and Reproductive Implications of Exposure of Pacific Herring Clupea Pallasi Adults and Eggs to Weathered Crude Oil and Reproductive Condition of Herring Stock in Prince William Sound Six Years After the Exxon Valdez Oil Spill written by Mark G. Carls and published by . This book was released on 1997 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Herring written by Alaska Sea Grant College Program and published by Alaska Sea Grant College Program. This book was released on 2001 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt: To help solve the unknowns in herring fisheries, and to optimize herring harvest, researchers presented their work at the symposium Herring 2000, in Anchorage, Alaska. The high levels of enthusiasm shared during the symposium are sustained in this prolific and thorough proceedings book, with 50 peer-reviewed research articles on herring biology and ecology worldwide, social and economic aspects of herring fisheries, and herring fisheries management. Winner of a 2002 Apex award.

Download or read book Seasonal Distribution and Environment of Adult Pacific Herring Clupea Harengus Pallasi Near Auke Bay Lynn Canal Southeastern Alaska written by Harry Richard Carlson and published by . This book was released on 1984 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: The distribution of adult Pacific herring (Clupea harengue pallasi) near Auke Bay, Lynn Canal, southeastern Alaska, varied by depth and geographic area over 24 successive months during 1973-75. From June through September, schools concentrated at 5- to 37-m depths where zooplankton was abundant, and moderate currents were present in a stratified water column. The schools migrated from this area to wintering grounds in October when windstorms and sinking of cooling surface waters broke up stratification, day length shortened, and food abundance declined drastically. The schools remained near bottom in the deeper parts of the wintering grounds at 52- to 85-m depths into February or March when day length had increased, but temperatures and food abundance remained low. At this time, the herring left the wintering grounds and moved up Lynn Canal to areas near spawning beaches. Pacific herring remained in these areas until water temperatures increased and plankton blooms appeared in late April and May, at which time the fish moved into the shallows and spawned. By early summer, the schools gradually concentrated again on the main feeding grounds. An evaluation of the study design and potential for improvements in similar studies is included.

Download or read book Population Structure of Pacific Herring Clupea Harengus Pallasi in Eastern Prince William Sound Alaska written by Charles Burkey and published by . This book was released on 1986 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Jellyfish Blooms Ecological and Societal Importance written by J.E. Purcell and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: `Jellyfish', a group that includes scyphomedusae, hydromedusae, siphonophores and ctenophores, are important zooplankton predators throughout the world's estuaries and oceans. These beautiful creatures have come to public attention as featured exhibits in aquaria and in news headlines as invaders and as providers of genes used in biomedical research. Nevertheless, jellyfish are generally considered to be nuisances because they interfere with human activities by stinging swimmers, clogging power plant intakes and nets of fishermen and fish farms, and competing with fish and eating fish eggs and larvae. There is concern that environmental changes such as global warming, eutrophication, and over-fishing may result in increased jellyfish populations. The literature reviews and research papers in this volume explore the interactions between jellyfish and humans. Papers cover the medical aspects of jellyfish stings, jellyfish as human food and jellyfish fisheries, interactions of jellyfish and fish, effects of environmental changes on jellyfish, effects of introduced ctenophores on the Black Sea ecosystem, factors causing increases or concentrations of jellyfish, and others aspects of jellyfish ecology. This is an important reference for students and professional marine biologists, oceanographers, fishery scientists, and aquarists.

Download or read book Physical and Biological Factors Affecting Pacific Herring Egg Loss in Prince William Sound Alaska written by Christopher N. Rooper and published by . This book was released on 1996 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: The biomass of Prince William Sound herring (Clupea pallasi) is estimated from egg deposition surveys. Because surveys occur after spawning, a correction for egg loss is required. I constructed ANOVA models based on environmental factors to estimate the egg loss correction in 1990-1991 and 1994-1995. The models explained 52% to 85% of the data variation. Depth of spawn was the primary factor determining egg loss, and air exposure could be substituted for depth. The correction factor was estimated at 33%. The total loss of eggs from spawning to hatching ranged from 67.40% to 100% averaging 76.06%, Two processes affecting egg loss, wave action and fish predation, were also examined. Typical wave energies were not found to contribute significantly to egg loss, but a threshold wave energy may exist beyond which egg loss is high. Consumption of eggs by greenling (Hexagrammidae) was estimated at 2.2% to 8.5% of the total spawn.