Ration and Temperature Effects on the Condition of Male Adolescent Molter and Skip Molter Snow Crab

Dutil, Jean‐Denis; Dion, Cheryl Ann; Gamache, L.; Larocque, Richard; Ouellet, Jean-François

doi:10.2983/035.029.0404

Cited by 8 publications

(3 citation statements)

References 49 publications

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“…However, the study importantly extends upon this by demonstrating interactions between the two factors in regulating fishery SS levels. The study also advances knowledge on the impacts of temperature on molt-timing in wild populations, supporting previous tank-based observations of earlier molting under warm conditions (Dutil et al, 2010).…”

Section: Biology Of Soft-shell Crabsupporting

confidence: 84%

“…The timing of molting is likely affected by temperature, but this relationship has received little directed study in wild populations. Tank-based studies have shown that snow crab maintained in warmer conditions molt earlier and have reduced post-molt recovery times relative to those molting in colder conditions (Dutil et al, 2010). Warmer conditions have also been shown to promote higher synchrony in the primiparous female mating/molting period for snow crab kept in tanks (Sainte-Marie et al, 2010).…”

Section: Biology Of Soft-shell Crabmentioning

confidence: 99%

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Hard to Manage? Dynamics of Soft-Shell Crab in the Newfoundland and Labrador Snow Crab Fishery

2021

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Capture of recently molted soft-shell crab in the Newfoundland and Labrador (NL) snow crab (Chionoecetes opilio) fishery is undesirable due to resource wastage associated with low meat yield and supposed high mortality rates upon discard. This study is intended to formalize best-practice management advice for avoidance of soft-shell crab in the fishery. The study investigates factors affecting soft-shell incidence in the catch across a large geographic stock range encompassing dynamic habitat and contrasting harvest rate strategies. The results demonstrate an interaction between seasonality and harvest rate in governing soft-shell crab levels in the fishery. Greatest potential for high soft-shell incidence occurs in late-spring or summer (June–July) fisheries in warm water populations subjected to heavy fishing pressure, with warm water populations shown to be associated with earlier molting periods. The study concludes that the optimal time to harvest snow crab is during winter or early spring, and advises that wherever winter or early spring fisheries are not possible, a best-practice management strategy is to minimize wastage by maintaining a strong residual biomass of large hard-shell males in the population at all times. This strategy is easily enabled by consistent application of low exploitation rates.

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Section: Biology Of Soft-shell Crabsupporting

confidence: 84%

Section: Biology Of Soft-shell Crabmentioning

confidence: 99%

Hard to Manage? Dynamics of Soft-Shell Crab in the Newfoundland and Labrador Snow Crab Fishery

2021

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“…The decrease in incidence of skip molting with increasing temperature is consistent with increasing molting frequency with temperature in crustaceans generally (Hartnoll 1982), which reflects a direct effect of temperature on metabolic rate. Paul & Paul (2001) found that the intermolt period in Tanner crab (Chionoecetes bairdii) is inversely related to temperature, while more recently, Dutil et al (2010) showed that in the laboratory, snow crabs molt earlier at higher than at lower temperatures.…”

Section: Effects Of Temperaturementioning

confidence: 99%

Effects of temperature on size-at-terminal molt and molting frequency in snow crab Chionoecetes opilio from two Canadian Atlantic ecosystems

Dawe¹,

Mullowney²,

Moriyasu³

et al. 2012

Mar. Ecol. Prog. Ser.

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The effect of temperature on molting frequency and size-at-terminal molt of the snow crab Chionoecetes opilio was investigated and compared between 2 Canadian Atlantic ecosystems based on spring and summer surveys. We found that the size-at-terminal molt was directly related to temperature but that the effect of temperature was much clearer and occurred at smaller sizes for females than for males. By focusing on recently molted (new-shelled) crabs, we showed that size-at-terminal molt is conditioned by temperature over a variable number of instars and intermolt periods leading up to the terminal molt. Crabs of both sexes larger than about 50 mm carapace width (CW), on annual molting schedules, sometimes skipped a molt. The frequency of skip-molting differed between the areas and sexes, and was directly related to size and in versely related to temperature. We develop a hypothesis to explain the relationships of terminal size with temperature and molting frequency that is consistent with life-history theory and snow crab bioenergetics and considers differences between the sexes. The implications to natural mortality and recruitment to fisheries are also discussed.

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Patterns and implications of skip-molting for the Eastern Bering Sea snow and Tanner crab (Chionoecetes opilio and C. bairdi)

Murphy¹

2019

Fisheries Research

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Ration and Temperature Effects on the Condition of Male Adolescent Molter and Skip Molter Snow Crab

Cited by 8 publications

References 49 publications

Hard to Manage? Dynamics of Soft-Shell Crab in the Newfoundland and Labrador Snow Crab Fishery

Hard to Manage? Dynamics of Soft-Shell Crab in the Newfoundland and Labrador Snow Crab Fishery

Effects of temperature on size-at-terminal molt and molting frequency in snow crab Chionoecetes opilio from two Canadian Atlantic ecosystems

Patterns and implications of skip-molting for the Eastern Bering Sea snow and Tanner crab (Chionoecetes opilio and C. bairdi)

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