Download or read book Kootenai River White Sturgeon Investigations and Experimental Culture 1989 1990 Annual Report written by and published by . This book was released on 1991 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Setline and angling techniques were used to sample 332 sturgeon from the river between Kootenai Falls and Kootenay Lake during 1989 and 1990. Sturgeon were found in Montana within 4 km of Kootenai Falls and downstream from Bonners Ferry, Idaho to Kootenay Lake, British Columbia. Our data indicate there is a complete lack of recruitment of juveniles into the population. The youngest fish sampled was of the 1977 year class, and the population is estimated at 880 individuals with 95% confidence intervals of 638 to 1,211. Culture of one pair of sturgeon in 1990 was of limited success. Less than 5% of eggs hatched with 50% initial mortality of fry. The contribution of contaminants found in eggs (aluminum, copper, zinc, lead, and organochlorides) toward this poor survival is unknown. Handling problems with the eggs at the time of spawning complicated our results. An ongoing sonic telemetry study has revealed definite long distance movements. Sturgeon regularly move across the British Columbia-Idaho border and seek out deep holes or migrate to Kootenay Lake during late fall. Seasonal differences in use of depth and velocity parameters were found between sexes and among seasons. No relationships were found between sturgeon movement and month, water temperature, flow, and flow change. However, multiple regression analysis indicated that up to 30% of the variance in individual sturgeon movement was explained by the combination of the four variables.
Download or read book Kootenai River White Sturgeon Investigations and Experimental Culture 1990 1991 Annual Report written by and published by . This book was released on 1992 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: Setline and angling techniques were used to sample 56 white sturgeon Acioenser transmontanus from the Kootenai River in 1991. Of those sampled, nine were recaptures from previous years of this study. A total of 382 white sturgeon were captured from March 1989 through October 1991. Fork lengths of white sturgeon in the sample ranged from 88-274 cm. Our data indicated there was a complete lack of recruitment of juveniles into the population. The youngest fish sampled was of the 1977 year class. The population was estimated at 880 individuals with a 95% confidence interval of 638 to 1,211. Annual mortality of white sturgeon since 1982 is 3.74%. Approximately 80% of the population was more than 20 years old and was reproductively mature. Surgical examination of 309 white sturgeon since 1989 indicated that approximately 7% of the female white sturgeon and 30% of the male white sturgeon are reproductive each year. The ratio of males to females was estimated at 1:l. White sturgeon sampled and released with and without surgical examination were recaptured at equal rates. An ongoing sonic telemetry study has documented long distance movements by adults. White sturgeon regularly move across the British Columbia - Idaho border. White sturgeon seek out deep holes in the river or migrate to Kootenay Lake during late fall, During spring and early summer of both 1990 and 1991 reproductively mature white sturgeon moved from 15 to 110 km upriver and congregated within 10 km downriver from Bonners Ferry in areas of elevated water velocity. This behavior coincided with increasing discharge and water temperatures. Developing white sturgeon eggs were recovered from the river near Bonners Ferry on July 3, 1991. Contamination of eggs by organochloride compounds were less in recent samples from the Kootenai River than in a single sample collected in 1982. White sturgeon eggs from the Kootenai River fish contained approximately one tenth the organochloride compounds of white sturgeon eggs from the lower Columbia River.
Download or read book Research and Development Report written by United States. Bonneville Power Administration and published by . This book was released on 1993 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kootenai River White Sturgeon Investigations and Experimental Culture 1988 1989 Annual Report written by and published by . This book was released on 1990 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: The population of white sturgeon in the Kootenai River has continued to decline since 1983, in spite of a closure to harvest in the U.S. section of the river. Setline and angling techniques were used to sample 228 sturgeon from the river between Kootenai Falls and Kootenay Lake during 1989. Sturgeon were found in Montana within 4 km of Kootenai Falls and downstream from Bonners Ferry, Idaho to Kootenay Lake, British Columbia. Our data indicate there is a complete lack of recruitment of juveniles into the population. The youngest fish sampled was of the 1977 year class, and the population is estimated at 850 individuals with 95% confidence intervals of 574 to 1,463. At present, we do not understand what mechanisms are limiting recruitment. Over the past 70 years, the lower Kootenai River has been extensively diked for flood control, effectively eliminating backwater and slough areas that may have provided juvenile rearing habitat: Contaminants have entered the river system via mining operations and agricultural practices. In 1972, Libby Dam began operation, reversing the natural flow regime of the river, and releasing frequent power peaking flows. Of 179 fish that were surgically sexed, 37% were female and 35% were male. Thirty-four percent of the females held developing oocytes. All oocyte samples from nine females contained copper (1.18 to 2.50 [mu]g/g) and zinc (15.6 to 32.8 [mu]g/g). Most samples also contained organochloride residues such as DDT, DDD, DDE, and PCBs (0.215 to 1.080 [mu]g/g, combined). River sediment samples contained 1.62 to 12.8 [mu]g/g copper and 22.4 to 70.6 [mu]g/g zinc, but no organochloride residues. Electrophoretic analysis of muscle samples indicated reduced heterogeneity compared with lower basin white sturgeon and showed a significantly different degree of variation between the two stocks in seven enzyme systems. An ongoing sonic telemetry study has revealed definite long distance movements in response to water flow fluctuations. Sturgeon regularly move across the British Columbia-Idaho border and seek out deep holes or migrate to Kootenay Lake during late fall. Adequate ranges in river depth and current velocity allow sturgeon to select for those habitat parameters; however, turbidity and temperature are homogeneous throughout the river at any given time.
Download or read book Federal Register written by and published by . This book was released on 1993-07-07 with total page 1180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Columbia River System Operation Review Main report written by and published by . This book was released on 1995 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kootenai River White Sturgeon Investigations and Experimental Culture 1992 Annual Report written by and published by . This book was released on 1993 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Setline and angling techniques were used to sample 64 white sturgeon Acipenser transmontanus from the Kootenai River in 1992. Of those sampled, 15 were recaptures from previous years of this study. A total of 429 white sturgeon were captured from March 1989 through September 1992. Fork lengths of white sturgeon in the total sample ranged from 88 to 274 cm. The data indicated there was a complete lack of recruitment of juveniles into the population which was estimated in 1990 at 880 individuals with a 95% confidence interval of 638 to 1,211. Annual mortality of white sturgeon from 1982 to 1991 was 0.0374. Approximately 80% of the population was more than 20 years old and was reproductively mature. An ongoing sonic telemetry study revealed long distance movements among adults. Sturgeon regularly moved across the British Columbia-Idaho border. Sturgeon used deep holes in the river or migrated to Kootenai Lake during late fall. During spring and early summer, reproductively mature sturgeon moved from 15 to 110 kilometers upriver and congregated within 15 kilometers downriver from Bonners Ferry in areas of elevated water velocity. This behavior coincided with increasing discharge and water temperatures. The authors monitored movements of five reproductively mature female white sturgeon. The fish responded to increasing then decreasing flows by moving upriver then downriver, respectively. All five fish quickly moved to Kootenai Lake when flows dropped suddenly from higher than 20 kcfs to less than 10 kcfs. One fish was recaptured and was reabsorbing eggs. Trawling and sampling with mats of artificial substrate failed to capture white sturgeon eggs or larvae in 1992. One hundred and four age 1 and 14 age 2 hatchery-reared Kootenai white sturgeon were released into the Idaho section of the river in 1992. Telemetry of six of the larger juveniles showed general downriver movement from September into November.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-04 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kootenai National Forest N F West Troy Project written by and published by . This book was released on 2004 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kootenai National Forest N F Skyline Ridge written by and published by . This book was released on 1995 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kootenai National Forest N F Sheep Range and China Basin Salvage Project Lincoln County written by and published by . This book was released on 1998 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kootenai National Forest N F Bull Lake Estates Access Three Rivers Ranger District written by and published by . This book was released on 2000 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book White Sturgeon Management Framework Plan written by and published by . This book was released on 1992 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Swan Falls Instream Flow Study written by Donald R. Anglin and published by . This book was released on 1993 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Columbia River System Operation Review SOR written by and published by . This book was released on 1996 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kootenai National Forest N F Bull Lakes Estates Road Access Project written by and published by . This book was released on 1998 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1994-07 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
