Zoogeography of the parasites of Pacific halibut (<i>Hippoglossus stenolepis</i>) in the northeast Pacific

Blaylock, Reginald B.; Margolis, L.; Holmes, J C

doi:10.1139/z98-172

Cited by 28 publications

(34 citation statements)

References 15 publications

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“…If any movement to the GOA occurred, it was relatively transient and there is no evidence to support the hypothesis that it was associated with spawning. We are unable to speculate about the population differentiation of Pacific halibut throughout its range, but the apparently high rates of retention of a BSAI region spawning group suggests that there was some merit to the multiple stock concept used by the IPHC from the 1930s to the 1950s (Thompson & Herrington 1930, Van Cleve & Seymour 1953), which was further supported by parasite data in later studies (Blaylock et al 2003). While our results suggest that halibut that feed in the BSAI region during summer are unlikely to mix into the GOA spawning group, they say nothing about whether mixing might occur via the reverse phenomenon: halibut that feed in the GOA joining BSAI spawning groups.…”

Section: Spawning Group Spatial Structurementioning

confidence: 67%

Dispersal and behavior of Pacific halibut Hippoglossus stenolepis in the Bering Sea and Aleutian Islands region

Seitz¹,

Loher²,

Norcross³

et al. 2011

Aquat. Biol.

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Currently, it is assumed that eastern Pacific halibut Hippoglossus stenolepis belong to a single, fully mixed population extending from California through the Bering Sea, in which adult halibut disperse randomly throughout their range during their lifetime. However, we hypothesize that hali but dispersal is more complex than currently assumed and is not spatially random. To test this hypo thesis, we studied the seasonal dispersal and behavior of Pacific halibut in the Bering Sea and Aleutian Islands (BSAI). Pop-up Archival Transmitting tags attached to halibut (82 to 154 cm fork length) during the summer provided no evidence that individuals moved out of the Bering Sea and Aleutian Islands region into the Gulf of Alaska during the mid-winter spawning season, supporting the concept that this region contains a separate spawning group of adult halibut. There was evidence for geographically localized groups of halibut along the Aleutian Island chain, as all of the individuals tagged there displayed residency, with their movements possibly impeded by tidal currents in the passes between islands. Mid-winter aggregation areas of halibut are assumed to be spawning grounds, of which 2 were previously unidentified and extend the species' presumed spawning range ∼1000 km west and ∼600 km north of the nearest documented spawning area. If there are indeed independent spawning groups of Pacific halibut in the BSAI, their dynamics may vary sufficiently from those of the Gulf of Alaska, so that specifically accounting for their relative segregation and unique dynamics within the larger population model will be necessary for correctly predicting how these components may respond to fishing pressure and changing environmental conditions. Aquat Biol 12: [225][226][227][228][229][230][231][232][233][234][235][236][237][238][239] 2011 Aleutian Islands. It is assumed that adult halibut feed in shallow, nearshore areas during the summer, undertake a spawning migration to deeper water during winter, and return to their summer grounds during spring (Dunlop et al. 1964, Best 1981. In the Southeast Bering Sea (SEBS), spawning appears to be concentrated in relatively discrete winter spawning grounds near the edge of the continental shelf in the Bering Canyon and the Pribilof Canyon ( Fig. 1) (St-Pierre 1984). After spawning, egg and larval stages drift pelagically in the Bering Sea gyre for approximately 6 mo (Skud 1977, St. Pierre 1989 and then settle in nearshore areas (Thompson & Van Cleve 1936). After settling, it is thought that juvenile halibut conduct contranatant migrations to the area in which they were spawned to maintain population stationarity (Skud 1977, Hilborn et al. 1995.From the 1930s through the 1950s, at least 3 stocks of halibut were recognized, 1 in the Bering Sea and 2 in the Gulf of Alaska (GOA) (Fukuda 1962, Skud 1977. After this period, research indicated extensive intermingling of halibut among areas, and it was assumed that there was only a single stock of halibut. This research was based, in part, on...

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Section: Spawning Group Spatial Structurementioning

confidence: 67%

Dispersal and behavior of Pacific halibut Hippoglossus stenolepis in the Bering Sea and Aleutian Islands region

Seitz¹,

Loher²,

Norcross³

et al. 2011

Aquat. Biol.

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“…This movement explains how stocks are perpetuated in areas where the eggs and larvae are dispersed long distances away from the spawning areas. These findings were reinforced by Blaylock et al (2002) who found that juvenile Pacific halibut do not have discrete parasitic compositions, suggesting that in the juvenile phase Pacific halibut occupy mixed stock nursery areas. Evidence of discrete parasitic compositions in adults, however indicated that the juveniles must home to spawning areas.…”

Section: Discussionmentioning

confidence: 86%

Tagging Results from the 2000-2004 Federal Experimental Fishery for Atlantic Halibut (Hippoglossus hippoglossus) in the Eastern Gulf of Maine

Kanwit¹

2007

J. Northw. Atl. Fish. Sci.

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Tagging results from five years of a federal experimental Atlantic halibut fishery in the eastern Gulf of Maine are presented in this paper. These data show both localized movements within the study area and long-distance emigrations of juveniles. Twenty-eight percent of the recoveries from this study were made in Canadian waters, demonstrating an interchange between fish in the Gulf of Maine and those considered part of the Scotian Shelf/Southern Grand Banks stock unit. The predominance of long-distance, northeastward movement of juveniles poses the question of compensatory emigration in response to the predicted southwestward drift of eggs and larvae.

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“…Despite the commercial and social importance of this species, little is known about population structure throughout its geographic range. Previous studies have attempted to define population structure for Pacific halibut using allozymes (Tsuyuki et al 1969;Grant et al 1984), microsatellite loci Hauser et al 2006), parasite load (Blaylock et al 2003) and tagging experiments (Skud 1977;Seitz et al 2003;Loher and Seitz 2006b), but only weak evidence has been shown to support discrete populations.…”

Section: Introductionmentioning

confidence: 99%

Fine-scale population genetic structure in Alaskan Pacific halibut (Hippoglossus stenolepis)

2009

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Pacific halibut collected in the Aleutian Islands, Bering Sea and Gulf of Alaska were used to test the hypothesis of genetic panmixia for this species in Alaskan marine waters. Nine microsatellite loci and sequence data from the mitochondrial (mtDNA) control region were analyzed. Eighteen unique mtDNA haplotypes were found with no evidence of geographic population structure. Using nine microsatellite loci, significant heterogeneity was detected between Aleutian Island Pacific halibut and fish from the other two regions (F ST range = 0.007-0.008). Significant F ST values represent the first genetic evidence of divergent groups of halibut in the central and western Aleutian Archipelago. No significant genetic differences were found between Pacific halibut in the Gulf of Alaska and the Bering Sea leading to questions about factors contributing to separation of Aleutian halibut. Previous studies have reported Aleutian oceanographic conditions at deep inter-island passes leading to ecological discontinuity and unique community structure east and west of Aleutian passes. Aleutian Pacific halibut genetic structure may result from oceanographic transport mechanisms acting as partial barriers to gene flow with fish from other Alaskan waters.

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Zoogeography of the parasites of Pacific halibut (Hippoglossus stenolepis) in the northeast Pacific

Cited by 28 publications

References 15 publications

Dispersal and behavior of Pacific halibut Hippoglossus stenolepis in the Bering Sea and Aleutian Islands region

Dispersal and behavior of Pacific halibut Hippoglossus stenolepis in the Bering Sea and Aleutian Islands region

Tagging Results from the 2000-2004 Federal Experimental Fishery for Atlantic Halibut (Hippoglossus hippoglossus) in the Eastern Gulf of Maine

Fine-scale population genetic structure in Alaskan Pacific halibut (Hippoglossus stenolepis)

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