Macrozooplankton And Small Nekton In The Coastal Waters Off Vancouver Island Canada And Washington Spring And Fall Of 1963
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Seasonal Distributions of Larval Flatfishes (Pleuronectiformes) on the Continental Shelf Between Cape Cod, Massachusetts, and Cape Lookout, North Carolina, 1965-66
Author | : W. G. Smith |
Publisher | : |
Total Pages | : 636 |
Release | : 1975 |
Genre | : Bothidae |
ISBN | : |
Larval flatfishes, representing 4 families, 17 genera, and 15 species, were identified from collections taken during a 1-yr survey designed to locate spawning grounds and trace dispersion of fish eggs and larvae on the continental shelf. Most flatfishes began spawning in the spring, a time of marked seasonal temperature change. The seasonal distribution of larvae indicated that: 1) bothids had longer spawning seasons than pleuronectids; 2) pleuronectids spawned largely in the northern half of the survey area during the spring; 3) most bothids spawned in the southern half, beginning in spring and continuing through early fall; 4) although cynoglossids spawned incidentally off North Carolina, most of their larvae were transported into the survey area from spawning grounds south of Cape Lookout; 5) the few representatives of the family Soleidae originated south of Cape Lookout; 6) spawning that began in the spring proceeded from south to north as the season progressed, but spawning that began in the fall proceeded from north to south, suggesting that the onset of spawning is triggered by spring warming and fall cooling; 7) most species spawned within a relatively narrow range of temperature; 8) salinity had no apparent influence on spawning.
Proceedings of the International Billfish Symposium, Kailua-Kona, Hawaii, 9-12 August 1972
Author | : Richard S. Shomura |
Publisher | : |
Total Pages | : 738 |
Release | : 1975 |
Genre | : Billfish fisheries |
ISBN | : |
Fur Seal Investigations, 1969
Author | : Marine Mammal Biological Laboratory (U.S.) |
Publisher | : |
Total Pages | : 584 |
Release | : 1971 |
Genre | : Northern fur seal |
ISBN | : |
Expendable Bathythermograph Observations from the NMFS/MARAD Ship of Opportunity Program for 1972
Author | : Steven K. Cook |
Publisher | : |
Total Pages | : 92 |
Release | : 1975 |
Genre | : Ocean temperature |
ISBN | : |
Results of the second year of operation of the NMFS/MARAD Ship of Opportunity Program are presented in the form of vertical distributions of temperature and horizontal distributions of sea surface salinity and temperature. Operational and data management procedures also are discussed.
Pink Salmon, Oncorhynchus Gorbuscha, Tagging Experiments in Southeastern Alaska, 1938-42 and 1945
Author | : Roy E. Nakatani |
Publisher | : |
Total Pages | : 48 |
Release | : 1975 |
Genre | : Chatham Strait (Alaska) |
ISBN | : |
A total of 20, 532 pink salmon (Oncorhynchus gorbuscha) were tagged and released in southeastern Alaska north of Sumner Strait during the years of 1938 to 1942 inclusive, and in 1945. The recovery of 7, 027 of these tags in the fish traps confirmed the findings of other investigators that the pink salmon stocks of the northern part of southeast Alaska are separate from those in the southern part. They also show that pink salmon enter the northern part of southeast Alaska through two paths: (1) through Icy Strait, and (2) through the lower end of Chatham Strait. No evidence was found of movement through Peril Strait from Salisbury Sound into Chatham Strait. The centers of density of each group of tags appeared to move in a consistent manner, but a smaller number of tags from each release were dispersed throughout the northern part of southeastern Alaska. Differences were noted between the movements of fish in odd and even years. Also a larger proportion of earlier tagged fish moved to recovery locations father [sic] inland. In all areas and in all years the fishing season closed about the time of the greatest abundance of fish in the fishery, therefore the later parts of the runs were not studied. Apparently the 1941 run was the largest and that in 1945 the smallest. Migration rates were studied by plotting the catch per trap as well as by the recovery of tags. The latter showed movements of 9.05 to 33.37 miles per day. Survival rates computed for thirty releases with total tag recovery periods of two or more weeks averaged 0.384. Weekly exploitation rates varied from 0.142 to 0.452 averaging 0.250. The weekly F exponential rate of fishing averaged 0.514. Recoveries of tags from seines were not used since their proportion of tags recovered was less than one-half their proportion of the catch. Recommendations are made for future tagging experiments based upon the results of this analysis.
Dissolved Nitrogen Concentrations in the Columbia and Snake Rivers in 1970 and Their Effect on Chinook Salmon and Steelhead Trout
Author | : Wesley J. Ebel |
Publisher | : |
Total Pages | : 16 |
Release | : 1971 |
Genre | : Chinook salmon |
ISBN | : |