Reproductive Ecology, Fecundity, and Elemental Composition of Eggs in Brown Crab<i>Cancer pagurus</i>in The Isle of Man

Öndes, Fikret; Kaiser, Michel J.; Murray, Lee G.; Torres, Gabriela

doi:10.2983/035.035.0226

Cited by 5 publications

(5 citation statements)

References 51 publications

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“…The ability for males to mature at smaller sizes could be of benefit by improving the probability of mating success in populations where the ratio is in favour of females and competition is higher. Discrepancies between regions in relation to sexual maturity is common, as previous studies have shown that males can express a CW 50 range of 56-125 mm and females 86-133.5 mm across the UK, and in a recent study by [8] the CW 50 for East Scotland was 101-106 mm for males and 127-128 mm for females which coincides with the results found in the literature [8,11,28]. Previous reports from stock assessment surveys by NIFCA suggested a CW 50 of 89.5 mm for males and 111.6 mm for females [29].…”

Section: Physiological Maturitysupporting

confidence: 86%

“…Previous reports from stock assessment surveys by NIFCA suggested a CW 50 of 89.5 mm for males and 111.6 mm for females [29]. The female CW 50 value from this assessment follows suit to the value of [28] at 112 m; however, from this study there is a 8-14 mm difference when both locations are considered which suggests a regional variation across a latitudinal range. It should be stated that the study by [29] used parameters specified by CEFAS (The Centre for Environment, Fisheries and Aquaculture Science), which are used for their assessments, to inform stock assessments rather than specific SOM.…”

Section: Physiological Maturitymentioning

confidence: 45%

“…It has been recorded that age of maturity for female C. pagurus is four years which was the oldest age of maturation recorded by [14], and the reproductive cycle was predicted to be seven years which included an annual or two annual broods [14]. Fishing pressure is documented to change growth patterns over ecological and evolutionary time periods [7,28]. In this instance, ecological change by fishing pressure may suggest the change in SOM for the Northumberland cohort when NIFCA historic data in [33] are compared with this study.…”

Section: Morphometric Maturitymentioning

confidence: 99%

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Comparing the Size at Onset of Sexual Maturity of Edible Crab (Cancer pagurus, Cancridae) in Berwickshire and Northumberland

Easton¹,

Boon²,

Richards

et al. 2023

Fishes

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The literature suggests regional variations in the size at which sexual maturity is reached for commercially important edible crab (Cancer pagurus), worth GBP 74.3 million annually, which could have implications for regional fisheries management. Berwickshire and Northumberland are geographically divided by the Scotland and England border and remain within the Berwickshire and North Northumberland Coast SAC (Special Area of Conservation). Each are managed by differing fisheries authorities and Minimum Conservation Reference Sizes (MCRS). Morphometric measurements were recorded for each C. pagurus individual to categorise morphometric maturity using segmented regression, with gonadal maturity categorised using visual gonad characteristics and general linear model regressions to compare onset in sexual maturity. Results showed regional variations for gonadal maturity with males reaching sexual onset at a carapace width size of 108.5 mm in Berwickshire and 109.9 mm in Northumberland; females at a size of 126.8 mm in Berwickshire and 120.8 mm in Northumberland. This was also true for morphometric maturity based on chelae height, that males (141.1 mm) and females (134.7 mm) from Berwickshire were morphometrically mature at greater sizes than males (130.1 mm) and females (120.8 mm) from Northumberland. This study shows that the respective MCRS in both regions are appropriate for the C. pagurus populations, but implications for fisheries management could be present.

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Section: Physiological Maturitysupporting

confidence: 86%

Section: Physiological Maturitymentioning

confidence: 45%

Section: Morphometric Maturitymentioning

confidence: 99%

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Comparing the Size at Onset of Sexual Maturity of Edible Crab (Cancer pagurus, Cancridae) in Berwickshire and Northumberland

Easton¹,

Boon²,

Richards

et al. 2023

Fishes

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“…Bottom water temperature peaks in September while March is the coldest month (Öndes et al , unpublished). The waters to the west of the Isle of Man are strongly stratified in the summer and autumn (Öndes et al , 2016). There are currently no seasonal closures that affect pot fisheries in the Isle of Man.…”

Section: Methodsmentioning

confidence: 99%

Fish and invertebrate by-catch in the crab pot fishery in the Isle of Man, Irish Sea

2017

Self Cite

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Baited trap or pot fisheries are considered to have relatively few wider ecosystem effects on the marine environment, particularly when compared with towed mobile fishing gear. However, this assumption is rarely tested in the field. This study aimed to determine the composition of non-target species that occur in crustacean pots and to assess spatial and temporal differences in catches in the waters around the Isle of Man, Irish Sea. The data were collected using fishery independent surveys and a questionnaire study. Based on fishery independent surveys, a total of five taxonomic groups and 43 species occurred as by-catch. The dominant by-catch species was velvet crab Necora puber. The by-catch per unit effort (BPUE) for all of the non-target species was low particularly in comparison to towed bottom gear fisheries around the Isle of Man. BPUE of species composition varied considerably between different locations around the Isle of Man. The results of both the fishery independent and questionnaire data suggested that the by-catch rates varied with season with peak BPUE occurring in spring which then declined into autumn and winter. By-catch composition did not decrease significantly with an increasing target species catch. Overall, by-catch was low relative to target species catch which may be partially attributable to the use of escape panels in pot fisheries in the Isle of Man.

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“…As many as 1–4 million eggs may hatch from one female brown crab, indicating their high fecundity. Because crabs are known to be migratory due to mating patterns, the hatchlings may be found over a vast distance [ 4 , 37 , 39 , 41 , 42 , 43 ], although the distribution and density of brown crabs are affected by many factors—not only fecundity or migration. For example, water temperature and access to food are additional important factors, and there tends to be greater population density inshore [ 37 ].…”

Section: Brown Crab ( Cancer Pagurus )mentioning

confidence: 99%

Cadmium: A Focus on the Brown Crab (Cancer pagurus) Industry and Potential Human Health Risks

Lordan

Zabetakis

2022

Toxics

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Cadmium is a major health risk globally and is usually associated with pollution and anthropogenic activity. The presence of cadmium in food is monitored to ensure that the health and safety of consumers are maintained. Cadmium is ubiquitous in the Asian and Western diets, with the highest levels present in grains, leafy greens, and shellfish. As part of their natural lifecycle of moulting and shell renewal, all crustaceans—including the brown crab (Cancer pagurus)—bioaccumulate cadmium from their environment in their hepatopancreas. The brown crab is an important species to the crab-fishing industries of many European countries, including Ireland. However, the industry has come under scrutiny in Europe due to the presence of cadmium in the brown crab meat intended for live export to Asia. This review explores evidence regarding the effects of cadmium consumption on human health, with a focus on the brown crab. Differences in cadmium surveillance have given rise to issues in the crab industry, with economic consequences for multiple countries. Currently, evidence suggests that brown crab consumption is safe for humans in moderation, but individuals who consume diets characterised by high levels of cadmium from multiple food groups should be mindful of their dietary choices.

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Reproductive Ecology, Fecundity, and Elemental Composition of Eggs in Brown CrabCancer pagurusin The Isle of Man

Cited by 5 publications

References 51 publications

Comparing the Size at Onset of Sexual Maturity of Edible Crab (Cancer pagurus, Cancridae) in Berwickshire and Northumberland

Comparing the Size at Onset of Sexual Maturity of Edible Crab (Cancer pagurus, Cancridae) in Berwickshire and Northumberland

Fish and invertebrate by-catch in the crab pot fishery in the Isle of Man, Irish Sea

Cadmium: A Focus on the Brown Crab (Cancer pagurus) Industry and Potential Human Health Risks

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