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  • 1
    Online Resource
    Online Resource
    Determination of relative survival of two stocked walleye populations and resident natural-origin fish by microsatellite DNA parentage assignment
    Canadian Science Publishing ; 2002
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 59, No. 2 ( 2002-02-01), p. 282-290
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 59, No. 2 ( 2002-02-01), p. 282-290
    Abstract: Walleye (Stizostedion vitreum) from two northern Minnesota spawning stations (Pike River, Hudson Bay drainage, and Little Cutfoot Sioux Lake, Mississippi River drainage) simultaneously stocked as fry into five southern Minnesota lakes had different survival rates. One year after stocking, Pike River walleye were more abundant than their original proportion of 46.5% of the stocked fish, but by the end of their second summer, neither population had a clear survival advantage. In the three lakes where walleye were consistently sampled, natural-origin walleye that descended from previous stockings significantly increased in percent of all sampled walleye over the study (P = 0.001). The unmarked and untagged stocked fish (N = 566) were assigned to their source population by comparing their genotypes at nine microsatellite DNA loci to the known genotypes of the parent pairs crossed in a hatchery (parentage assignment). Fish not assigned to a parent pair were considered to be the product of natural reproduction (N = 177) by previously stocked fish. Simulations indicated that natural-origin walleye were sufficiently excluded from assignment to stocked fish parent pairs so as not to bias the comparison. Parentage assignment is a powerful population discrimination tool if genotypes are known for all parent pairs from all but one putative source.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f02-007
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2002
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  • 2
    Online Resource
    Online Resource
    Genetic relationships among populations of northern pike ( Esox lucius )
    Canadian Science Publishing ; 2000
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 57, No. 2 ( 2000-02-01), p. 391-404
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 57, No. 2 ( 2000-02-01), p. 391-404
    Abstract: We assessed genetic variation, using microsatellite markers, in 14 populations of northern pike (Esox lucius) in the North Central United States and in six populations from Quebec, Alaska, Siberia, and Finland. Eight of 13 loci examined were polymorphic in at least one population with an average heterozygosity at all loci and across all populations of 0.14. The R st and F st values indicated differentiation among populations (R st = 0.61, F st = 0.42). Although microsatellite variation found in northern pike was much lower than that found in sympatric and other fish species, the polymorphisms differentiated populations of greater geographical proximity than was possible in prior studies using allozymes and mitochondrial DNA. We generated UPGMA-clustering phenograms based on five genetic distance measures with 2000 bootstrap replicates per measure. All measures yielded highly repeatable population structure between continents (supporting values = 92.4-100%) and within Finland (42.3-98%). Four measures differentiated the Alaskan population and Young Lake (Great Lakes drainage) from other North American populations (56.6-87.7%). Relationships among other North Central United States populations were unclear, as indicated by low supporting values. Results support the hypotheses of one refugium in the North Central United States and more than one refugium in Europe during the last glaciation.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f99-261
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2000
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    detail.hit.zdb_id: 1473089-3
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  • 3
    Online Resource
    Online Resource
    Estimation of Selection Differentials from Fish Scales: A Step Towards Evaluating Genetic Alteration of Fish Size in Exploited Populations
    Canadian Science Publishing ; 1994
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 51, No. 4 ( 1994-04-01), p. 774-783
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 51, No. 4 ( 1994-04-01), p. 774-783
    Abstract: We developed a model to predict genetic response to selection imposed by a size-selective fishery. Use of our model provides estimates of selection as a function of heritability and overall selection differential imposed against a size-related trait, length of a scale radius from the focus to a given annulus (radius n). Selection differentials were estimated using data from the walleye (Stizostedion vitreum) fishery in Red Lakes, Minnesota. Overall selection differentials, incorporating selection differentials estimated by age and sex, and weighted by the contribution to spawning, were negative for the 1955 spawning population and positive for that of 1958. Directions of selection differentials, estimated by age and sex, generally corresponded to expected directions of selection based on the shape of the gillnet selectivity curve for walleye, suggesting that scale radii are useful for estimating selection against size traits. Results indicated that selective effects of gear may be surprisingly complex and population characteristics must be well understood before changes in fishery management are considered. We suggest that measurement of overall selection differentials alone may provide a useful management tool for indicating genetic risks of selective fisheries.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f94-075
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1994
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    detail.hit.zdb_id: 1473089-3
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  • 4
    Online Resource
    Online Resource
    Stocking success of local-origin fry and impact of hatchery ancestry: monitoring a new steelhead ( Oncorhynchus mykiss ) stocking program in a Minnesota tributary to Lake Superior
    Canadian Science Publishing ; 2008
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 65, No. 2 ( 2008-02-01), p. 309-318
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 65, No. 2 ( 2008-02-01), p. 309-318
    Abstract: The inception of a hatchery program to rebuild a naturalized steelhead (Oncorhynchus mykiss) population in Minnesota waters of Lake Superior gave us the rare opportunity to monitor the success of fry stocking and determine if hatchery ancestry can reduce fitness of stocked fish in the early generations of a stocking program. Through genetic monitoring of two year classes, we determined that hatchery adults produced 1.3-6.2 times as many age-2 juveniles per female than naturally spawning fish. Survival of stocked fry of parents born in a hatchery relative to those of parents born in the wild was 70% in paired-stocking comparisons. These results suggest that stocking local-origin fry can increase the short-term abundance of depleted populations and that fish with no hatchery history are a better source for supplemental stocking. Additionally, sampling small numbers of adults for broodstock created genetically distinct groups, which could potentially cause long-term genetic change in the population. Genetic monitoring of adults will be essential to determining whether differences observed persist through the life cycle of the stocked fish.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f07-167
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2008
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    detail.hit.zdb_id: 1473089-3
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  • 5
    Online Resource
    Online Resource
    Implications of Introduction of Transgenic Fish into Natural Ecosystems
    Canadian Science Publishing ; 1991
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 48, No. S1 ( 1991-12-19), p. 99-107
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 48, No. S1 ( 1991-12-19), p. 99-107
    Abstract: Production of transgenic fish has increased in scope, aimed at improving performance traits in economically important species or at creating model systems for basic biological problems. A variety of transgenic phenotypes will become possible as more genes are cloned and characterized. Categories of altered phenotypes include modified: metabolic rates; tolerance of physical factors; behavior; resource or substrate use; and resistance to disease, parasitism, or predation. Ecological impacts of transgenic fishes are uncertain but will depend primarily on their altered phenotypes and secondarily on the scale and frequency of their introduction into ecosystems. Production of ecologically noxious transgenic types is possible, because many fish varieties readily disperse and persist in aquatic ecosystems, are fit in natural settings, interact substantially with other organisms, and play a role in ecosystem processes. Releases of transgenic fishes may impact aspects of fisheries management. Because future uses of transgenic fish in commercial aquaculture or in stocking of natural waters are contemplated, interdisciplinary teams of fisheries biologists, ecologists, and resource managers must develop integrated approaches to assessing risks of ecological impacts. The current situation of uncertainty demands caution in expecting "safe" uses of transgenic fishes.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f91-308
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1991
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  • 6
    Online Resource
    Online Resource
    A Conceptual Genetic Fitness Model for Fisheries Management
    Canadian Science Publishing ; 1986
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 43, No. 8 ( 1986-08-01), p. 1606-1616
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 43, No. 8 ( 1986-08-01), p. 1606-1616
    Abstract: A generalized model for managing fisheries to maintain reproductive fitness is proposed. The fitness of an individual within a stock is its number of successful progeny, where successful means survival to the reproductive stage. The fitness of a stock is a probability distribution (W) described by its mean [Formula: see text] and variance (V w ). An example of equations, derived from a variance effective number, expresses the distribution as a function of phenotypic variables (including abundance, immigration and age structure) which could be estimated in fishery surveys. Management of a stock as a self-perpetuating system requires maintenance of its probability distribution at a sufficiently broad level, estimated from reference generations, to allow it to perpetuate in the face of fishing and natural mortality in a changing environment. Modification of the distribution by exploitation or management actions imposes the risk of reduction of genotypic diversity in the stock. Selection of appropriate reference generations requires careful attention to biological detail. Application of the model is illustrated by computing the effective number for fictitious stocks with different life histories.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f86-199
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1986
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    SSG: 21,3
    SSG: 12
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  • 7
    Online Resource
    Online Resource
    On Density of Chum Salmon ( Oncorhynchus keta ) Eggs in Shallow Matrix Substrate Incubators
    Canadian Science Publishing ; 1983
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 40, No. 2 ( 1983-02-01), p. 185-191
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 40, No. 2 ( 1983-02-01), p. 185-191
    Abstract: Eyed chum salmon (Oncorhynchus keta) eggs were loaded at seven equidistant densities ranging from 10 760 to 75 350 eggs/m 2 of gravel into Netarts-type shallow matrix substrate incubators. Egg density did not affect fry survival but altered emergence timing which influenced fry quality. Fry emergence was most premature in the 32 290 and 43 060 eggs/m 2 treatments. Early migrants had higher development index values, more variable lipid contents, and lower water contents than peak and late migrants. Results are discussed in relation to economic and biological optimization of hatchery incubation.Key words: Oncorhynchus keta, egg density, gravel incubators, fry survival, fry quality
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f83-028
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1983
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    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
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