A new fishery for grooved Tanner crab (Chionoecetes tanneri) off the coast of British Columbia, Canada

Workman, G.; Philips, A.; Scurrah, F. E.; Boutillier, James A.

doi:10.4027/ccwrbme.2002.33

Cited by 9 publications

(12 citation statements)

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“…Workman et al . () estimated 50% morphometric maturity to be 112 mm for male and 88 mm for female grooved Tanner crab (Table ). For males this is slightly less than the value reported from Alaska (118.7 mm) whereas for females it is significantly greater (79.2 mm) (Somerton and Donaldson, ).…”

Section: Discussionmentioning

confidence: 99%

“…Based on these apparent patterns, our results suggest that separate curves should be developed for mature male and female grooved Tanner crab but not immature grooved Tanner crab within our study area. CW at 50% maturity Workman et al (2002) estimated 50% morphometric maturity to be 112 mm for male and 88 mm for female grooved Tanner crab (Table 5). For males this is slightly less than the value reported from Alaska (118.7 mm) whereas for females it is significantly greater (79.2 mm) (Somerton and Donaldson, 1996).…”

Section: Weight-size Relationshipmentioning

confidence: 99%

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Size at maturity for grooved Tanner crab (Chionoecetes tanneri) along the U.S. west coast (Washington to California)

Keller

Buchanan

Steiner

et al. 2016

Fisheries Oceanography

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We conducted a multiyear study to examine interannual variability in the mean size (carapace width, mm), maturity size (mm) and depth (m) for grooved Tanner crab (Chionoecetes tanneri (Rathbun, 1893)) along the U.S. west coast. An additional goal was to provide updated estimates of carapace width (mm) at 50% maturity (W 50 ) for male and female grooved Tanner crab and assess changes over time. Randomly selected samples came from trawl surveys undertaken annually by the Northwest Fisheries Science Center at depths of 55 to 1280 m. We used allometric relationships between carapace width (CW) and either abdominal width (AW) (females) or chela length (CL) (males) to determine functional maturity by sex. We evaluated maturity by fitting logistic regression models to proportion mature grooved Tanner crab. W 50 varied significantly between males (125.2 mm) and females (89.1 mm) but interannual differences were slight. The annual mean CW were greater for mature males (139.9-143.4 mm) relative to females (98.8-100.4 mm). The average sizes of immature grooved Tanner crab varied between sexes with males (75.7-84.6 mm) larger than females (66.7-71.9 mm). Size frequency distributions indicated little overlap in the size of mature male and female grooved Tanner crab but considerable overlap between immature grooved Tanner crab. The best model expressing complexity in growth incorporated width, sex and maturity stage. Depth ranged from 195-1254 m with the average depth of a mature grooved Tanner crab (females, 737 m; males, 767 m) significantly shallower than an immature (females, 949 m; males, 918 m) grooved Tanner crab.

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Section: Discussionmentioning

confidence: 99%

Section: Weight-size Relationshipmentioning

confidence: 99%

Size at maturity for grooved Tanner crab (Chionoecetes tanneri) along the U.S. west coast (Washington to California)

Keller

Buchanan

Steiner

et al. 2016

Fisheries Oceanography

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“…To date, most studies on deep-sea commercial species are based on trawling surveys (Francis and Clark, 2005;Devine et al, 2006). While trawling is an appropriate method to collect samples for precise identification, measurements, sexing and various observations such as hardness of shell or presence of diseases in deep-sea decapods (Phillips and Lauzier, 1997;Workman et al, 2002;Boutillier and Gillespie, 2005;Perry et al, 2005;Keller et al, 2012;Cusba and Paramo, 2017;Chakraborty et al, 2018), it is not suitable for high frequency time series (López Abellán et al, 2002;Keller et al, 2012). In addition, trawling is a destructive sampling technique which can impact the seafloor (Puig et al, 2012;Martín et al, 2014;Clark et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Before a fishery was instigated, an initial review of knowledge on the biology and ecology of C. tanneri and its congeneric species C. angulatus identified numerous data gaps regarding the distribution, abundance, population structure, life history characteristics, and bycatch in existing fisheries (Phillips and Lauzier, 1997). As a result of subsequent trawl and trap surveys used to assess abundance and life-history features (Boutillier et al, 1998;Workman et al, 2001Workman et al, , 2002, conservative commercial fishing quotas were set, and one area was closed to fishing as a control (Perry et al, 2005). Because of its potential as an emerging fishery, it is of great importance to better understand the distribution and population dynamics of C. tanneri.…”

Section: Introductionmentioning

confidence: 99%

“…The genus Chionoecetes includes four species from the Gulf of Alaska to northern Mexico (Rathbun, 1925;Pereyra, 1966;Hart, 1982): Chionoecetes bairdi and C. opilio, which occur in waters shallower than 450 m and C. tanneri and C. angulatus found from 458 to 1784 m and from 1069 to 3000 m, respectively (Rathbun, 1925;Pereyra, 1966;Hart, 1982;Workman et al, 2001). Stages of maturity are depth-segregated, with adults living from 600 to 900 m depth (Pereyra, 1966;Workman et al, 2002;Gillespie et al, 2004;Keller et al, 2012Keller et al, , 2016, and juveniles and subadults (immature with carapace width <10 cm; Keller et al, 2016) deeper than 900 m (1200 m for C. angulatus). Reproduction also impacts crab distribution through aggregating behaviors of adults in late winter (Pereyra, 1966;Workman et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Interannual Variation in the Population Dynamics of Juveniles of the Deep-Sea Crab Chionoecetes tanneri

2019

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Understanding the population dynamics of commercially fished deep-sea species, on seasonal to inter-annual scales, is of great importance in areas where fishing pressure is high. The remoteness of the deep-sea environment constitutes a challenge for monitoring these populations. The few studies that have investigated population structure of deep-sea species, have used trawls, a destructive approach for benthic ecosystems. The development of deep-sea observatories offers a continuous long-term presence on the seafloor. Using imagery from the Ocean Network Canada deep-sea observatory, video footage was acquired on a daily basis and analyzed to describe the population dynamics of the deep-sea crab Chionoecetes tanneri located in depths of 900-1000 m in Barkley Canyon, off Vancouver Island (BC, Canada). The objectives here were to describe the dynamics of the local population in relation to changes in environment and/or life-cycle related behaviors. Sampling sites were located along the canyon axis and on the canyon wall. Only juveniles (1-10 cm) were found at the axis site (1000 m depth) with densities varying from 0 to 144 individuals/m 2 . On the canyon wall (900 m depth), adults (>10 cm) were sporadically observed and densities were lower (max. 13 individuals/m 2 ). Variation in density between the two sites reflected the observed arrival of small individuals (<2.4 cm) at the axis site in summer and autumn. Apart from a distinct migration event in January 2015, intra-annual variability in density was higher than inter-annual variability as illustrated by significant annual and sub-annual cycles of 7.5 and 3.5 months. Our results confirmed the hypothesis of ontogenic migration and provide further insight into inter-molt periodicity; we demonstrated a duration of 16 months for one crab to grow from 1.8 cm to more than 5 cm. Our findings also show a correlation between population dynamics, chlorophyll concentration, surface wave height and wind speed, suggesting that surface blooms have a potential influence on the migration patterns of C. tanneri. Although our study was spatially limited (maximum surface 9 m), this innovative long-term study of a deep-sea crab demonstrates the potential of deep-sea observatories to enable research into the population dynamics of some deep-sea species.

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Distribution, biomass and size of grooved Tanner crabs (Chionoecetes tanneri) from annual bottom trawl surveys (2003–2010) along the U.S. west coast (Washington to California)

Keller

Harms

Buchanan

2012

Deep Sea Research Part I: Oceanographic Research Papers

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A new fishery for grooved Tanner crab (Chionoecetes tanneri) off the coast of British Columbia, Canada

Cited by 9 publications

References 0 publications

Size at maturity for grooved Tanner crab (Chionoecetes tanneri) along the U.S. west coast (Washington to California)

Size at maturity for grooved Tanner crab (Chionoecetes tanneri) along the U.S. west coast (Washington to California)

Interannual Variation in the Population Dynamics of Juveniles of the Deep-Sea Crab Chionoecetes tanneri

Distribution, biomass and size of grooved Tanner crabs (Chionoecetes tanneri) from annual bottom trawl surveys (2003–2010) along the U.S. west coast (Washington to California)

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