Growth Model for Alaska King Crab (<i>Paralithodes camtschatica</i>)

McCaughran, Donald A.; Powell, Guy C.

doi:10.1139/f77-151

Cited by 44 publications

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“…In two dives in the evening (around 8:00 PM) in the inner zone, a large number (estimated to be at least several thousands) of juvenile red king crabs were observed in pods. These crabs were approximately 50 to 70 mm in carapace length, and may be three to four years of age (McCaughran and Powell, 1977). They physically contacted each other, and were stacked up to several layers deep.…”

Section: Direct Observations Of Red King Crabs and Tanner Crabsmentioning

confidence: 99%

Distribution of red king crabs and Tanner crabs in the summer by habitat and depth in an Alaskan fjord

Zhou

Shirley

1997

Investig. mar.

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ABSTRACT.A manned submersible was used in a fjord in southeastern Alaska to study the distributional patterns of the red king crab (Paralithodes camtschaticus) and the Tanner crab (Chionoecetes bairdi) in summer. The cove was divided into three zones: inner, middle, and outer. Six types of habitats, including sand-mud, rock, shell, debris, rock wall, and algae, were identified from video tapes. A relatively flat sand-mud habitat located at the center of the cove occupied 60% of the sea bottom. This large habitat was bordered by steep rocky walls on both sides in most parts of the fjord except in the inner zone. The density of red king crab decreased from the inner zone to the outer zone, while the density of the Tanner crab was more uniform throughout the cove. Highest crab density was found in the sand-mud habitat with an overall density of 51 crabs ha -1 for the red king crab and 41 crabs ha -1 for the Tanner crab. No crabs were found in rock wall and algae habitats. Both crab species displayed a dome-shaped distribution with depth with maximum density at intermediate depths. Red king crabs had a maximum density (86 crabs ha Distribución de la centolla y del cangrejo Tanner en verano, de acuerdo al hábitat y a la profundidad, en un fiordo de Alaska RESUMEN. Se utiliza un sumergible tripulado para estudiar los patrones de distribución de la centolla (Paralithodes camtschaticus) y del cangrejo Tanner (Chionoecetes bairdi), en un fiordo del sureste de Alaska durante el período de verano. El área de estudio fue dividida en tres zonas: interior, media, y exterior. Seis tipos de habitat, incluyendo fangoarena, roca, conchas, cascajo, pared rocosa y algas, fueron identificadas a través de grabaciones realizadas en cintas de video. Un habitat fango-arenoso relativamente plano, ubicado en el centro de la ensenada, ocupa el 60% del fondo del mar. Este gran habitat estaba bordeado por paredes rocosas abruptas a ambos lados en la mayor parte del fiordo, excepto en la zona más al interior. La densidad de la centolla disminuye desde la zona interna hacia la zona exterior, en tanto que la densidad del cangrejo Tanner se presentó uniforme en toda la ensenada. La más alta densidad se encontró en el habitat fango-arenoso, con un total de 51 individuos ha -1 para la centolla y 41 individuos ha -1 para el cangrejo. Ni en las paredes rocosas ni en las algas se encontraron cangrejos. Ambas especies mostraron una distribución en forma de domo respecto a la profundidad, con densidades máximas en profundidades intermedias. La centolla presenta densidad máxima (86 individuos ha -1 ) en 70-80 m mientras que el cangrejo Tanner (105 individuos ha -1 ) a 140-150 m. Densas agregaciones de juveniles de centolla fueron observadas en la zona más interna de la ensenada, pero no se observaron allí agregaciones de individuos maduros de ninguna de estas especies.

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Section: Direct Observations Of Red King Crabs and Tanner Crabsmentioning

confidence: 99%

Distribution of red king crabs and Tanner crabs in the summer by habitat and depth in an Alaskan fjord

Zhou

Shirley

1997

Investig. mar.

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“…GROWTH McCaughran & Powell (1977) and Mauchline (1977) summarised the problems of applying classical fishery growth functions to crustacean growth, and suggested alternative strategies. From these studies it is clear that the frequency of moulting and the magnitude of the growth increment at each moult must be included, but there has been no comparative study of the results of applying classical fisheries growth functions versus empirical growth functions based on moult frequencies and increments to yield models.…”

Section: Dynamic Pool Models Backgroundmentioning

confidence: 99%

Application of yield models to the New Zealand rock lobster fishery

Saila

Annala

McKoy

et al. 1979

New Zealand Journal of Marine and Freshwater Research

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Two general types of yield model, stock production and dynamic pool (yield-per-recruit), were used to analyse available data for the New Zealand rock lobster, Jasus edwardsii (Hutton). An exponential stock production model was applied to commercial catch and effort data from 1945 to 1975 for the North and South Islands combined. The results suggest a maximum sustainable yield of 4227 t with an estimated optimal level of fishing effort of 784 vessels, about 60% of the 1975 number. Empirical and von Bertalanffy growth equations were derived from limited tag-recapture data from the Gisborne area. Both equations indicate that males grow faster than females. The empirical growth equation, based on moult increment and frequency as functions of size, is considered the more realistic. Two yield-per-recruit models provided different results, especially at low levels of natural and fishing mortality. One model (Beverton-Holt) incorporated the von Bertalanffy growth equation and the other (empirical model) an empirical growth equation; the latter model is considered more realistic. The empirical model suggests that a reduction in fishing mortality below the estimated present values will not result in a substantial increase in yield-per-recruit. No strong evidence for changing the minimum size at first capture emerged from the results of the empirical model. A need is evident for more data, spanning a greater size range, to provide better estimates of growth and natural mortality, because the yield-per-recruit models were found to be sensitive to both. INTRODUCTIONThe reck lobster, Jasus edwardsii (Hutton), is of great economic significance, and is now the single most valuable renewable resource taken by the New Zealand fishing industry. The fishery began to expand rapidly with the development of export markets in the latf 1940s. The latest statistics show that about 1979 t, [valued at approximately N.Z. $23 667 000 were exported in 1977 (Anon. 1978), compared with 1799 t ^valued at N.Z. $4 619 000 in 1966. Thus, it seems prudent to develop management plans as quickly as possible to ensure sustained high productivity cf this resource and to avoid the results of over-fishing.Some information on the geographic distribution, breeding biology, and development of this species is availab , e (Kensler 1967, Sorensen 1969. Street 1970Street , 1973a has provided important information on growth, moulting, movements, reproductior, and predation, and estimates of exploitation rates from field observations and marking studies. Kenslet (1968) examined the size-fecundity relationship ofj a limited number of females.Streejt (1973a, b) described some of the management measures being used and their probable significance, but management regulations should be reexamined in the light of recent information. Since 1974 a tagging programme has been carried out by personnel of the Fisheries Research Division using the western rock lobster tag (Chittleborough 1974), which is retained through ecdysis. In addition, catch sampling, analysis of fishi...

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“…Since the exoskeleton of a crab does not grow continuously, but increases in size only at molt, previous studies used the change in carapace size as a growth index (McCaughran and Powell, 1977). Weight changes are rarely con-sidered as a growth index.…”

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Feeding and Growth of the Red King Crab Paralithodes Camtschaticus Under Laboratory Conditions

Zhou

Shirley

Kruse

1998

Journal of Crustacean Biology

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Feeding and growth in wet weight of the red king crab Paralithodes camtschaticus were studied under laboratory conditions for 4 months from September 1993 to January 1994. Crabs were divided into 3 groups: ovigerous females, juvenile females, and mature males. Food consumption ( gÂ· dâ��1) significantly increased with crab wet weight (W), while feeding rate (FR, gÂ·kg 1Â·d 1), weightstandardized food consumption, decreased significantly with crab weight. The relationship of FRâ�¼W significantly differed between ovigerous females and juvenile females and males, but not between juvenile females and males, and can be expressed as FR = 70.9 -0.017 W (P � 0.001) for ovigerous females, FR = 64.1 -0.017 W (P � 0.001 ) for juvenile females and males. Crabs ceased feeding during molting, and feeding rates were significantly lower between 12 days before and 8 days after ecdysis than during the nonmolting period. Molted male crabs rapidly increased weight after molt. Their growth rate averaged 412.3 gÂ·kg 1 Â± 89.6 SD (wet weight) and decreased with crab weight. Among unmolted crabs, growth rates significantly differed between ovigerous females (66.6 gÂ·kg 1 Â± 19.4 SD), juvenile females (50.4 gÂ·kg 1 Â± 14.5 SD), and males (5.2 gÂ·kg 1 Â± 4.0 SD).

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Growth Model for Alaska King Crab (Paralithodes camtschatica)

Cited by 44 publications

References 0 publications

Distribution of red king crabs and Tanner crabs in the summer by habitat and depth in an Alaskan fjord

Distribution of red king crabs and Tanner crabs in the summer by habitat and depth in an Alaskan fjord

Application of yield models to the New Zealand rock lobster fishery

Feeding and Growth of the Red King Crab Paralithodes Camtschaticus Under Laboratory Conditions

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