Nephrops Species

Bell, Mike; Tuck, Ian; Dobby, Helen

doi:10.1002/9781118517444.ch12

Cited by 36 publications

(62 citation statements)

References 176 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Periods of burrow emergence vary in relation to ambient light conditions, sex and season (Bell et al 2006). The nutritional status of a wild animal depends on a variety of factors, such as abundance and quality of food, search and capture ability, conspecific and interspecific competition, predator avoidance and periodical physiological changes (Macleod et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Norway lobsters have been shown to be opportunistic predators and scavengers (Thomas & Davidson 1962) with stomach contents reflecting prey abundance rather than feeding preference (Bell et al 2006). Fluctuations in primary production will influence the abundance of the benthic organisms on which they feed and may result in a reduction in food availability in the winter (Stephens et al 1967).…”

Section: Introductionmentioning

confidence: 99%

“…In high density areas competition for food may limit scope for growth. Moreover, increased aggressive social behaviour in high density areas could drive up the metabolic rate and thus energy requirements (Tuck et al 1997b;Chapman & Bailey 1987;Parslow-Williams 1998;Tuck et al 1999;Bell et al 2006;Campbell et al 2009). …”

Section: Introductionmentioning

confidence: 99%

“…The reproductive cycle of female N. norvegicus shows latitudinal differences in the times of spawning, incubation, egg hatching and mating (Bell et al 2006). Those in the Clyde Sea Area contain both annual and biennial spawners (Bailey 1984).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Seasonal nutritional status in Norway lobsters,Nephrops norvegicus(L.): are females nutritionally compromised over the winter?

Watts

Albalat

Smith

et al. 2016

Marine Biology Research

View full text Add to dashboard Cite

Norway lobsters, Nephrops norvegicus, are sediment-dwelling decapod crustaceans that excavate burrows from which they make short excursions to feed by predation and scavenging. The females of this species are known to reside within their burrows for an extended period of time over the winter while brooding their eggs. The aim of this study was to assess the likelihood of these females being able to feed during this brooding period. Biophysical and biochemical measurements that had previously been shown to change with starvation under laboratory conditions in male N. norvegicus were taken for female N. norvegicus under similar conditions. These measurements were also compared in both sexes obtained from monthly trawl samples from the Clyde Sea Area, Scotland, UK, together with trawl composition data. The laboratory study showed that the hepatosomatic index, and the copper, lipid and water content of the hepatopancreas can be used as indicators of the state of starvation in females, as in males. In the wild, both sexes have reduced nutritional status during the winter, but not to the degree seen in animals starved for 20 weeks in aquarium trials. This study does not support the hypothesis that females cease feeding over winter, during their brooding period. Firstly, some females were unable to sustain ovary development during starvation under controlled conditions, contrary to field observations. Secondly, field data suggest that there is no sex-specific reduction in nutritional status. ARTICLE HISTORY

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seasonal nutritional status in Norway lobsters,Nephrops norvegicus(L.): are females nutritionally compromised over the winter?

Watts

Albalat

Smith

et al. 2016

Marine Biology Research

View full text Add to dashboard Cite

show abstract

“…The Norway lobster Nephrops norvegicus (L. 1758) is a resource of high commercial value for the north-east Atlantic Ocean and Mediterranean fisheries (Sardà, 1998a;Bell et al, 2006). On the Catalan coast (western Mediterranean), N. norvegicus landings attain approximately 200 t yr…”

Section: Introductionmentioning

confidence: 99%

The effects of seasonal variation on the nutritional condition ofNephrops norvegicus(Astacidea: Nephropidae) from wild populations in the western Mediterranean

et al. 2014

View full text Add to dashboard Cite

The Norway lobster, Nephrops norvegicus is a target fishery species in European waters. The stock assessment of N. norvegicus is complicated because it is caught in commercial gear only when it emerges from its burrow. Landings are lower in winter, and feeding limitations have been hypothesized as the cause. Wild large-sized male lobsters were sampled each season (winter, spring, summer and autumn), and two groups of animals were kept in captivity for 90 d (fed and fooddeprived). The hepatopancreas and muscle were dissected, weighted, frozen for biochemical analyses (proximal analyses and DNA/RNA) and fixed in Bouin solution for microscopic observations. The oxygen consumption rates in the wild individuals caught in the spring and in the captive animals after the treatments were measured. Significant differences among the experimental groups were observed in the lipid concentration of the hepatopancreas and muscle, the water content in the hepatopancreas, and the numbers of vacuoles and pyknotic nuclei in the cells of the tubules of the hepatopancreas. The results showed that the wild Norway lobsters generally presented intermediate values between those observed in the fooddeprived and the fed lobsters kept in captivity, but the values were closer to those obtained for the fed animals. This finding indicates that the wild animals exhibit a good nutritional condition throughout the year. Therefore, the wild males of N. norvegicus do not face food deprivation during winter as is suggested by the pattern of commercial catches, the flow of organic matter, and the moulting period/reproductive behaviour of the species.

show abstract

Shift in the larval phenology of a marine ectotherm due to ocean warming with consequences for larval transport

McGeady

Lordan

Power

2020

Limnology & Oceanography

View full text Add to dashboard Cite

Because environmental temperature has an important influence on developmental rate and physiology, marine ectotherms are vulnerable to phenology changes due to ocean warming. Identifying changes to phenology, the timing of biological events, and understanding their effect on recruitment and abundance is of critical importance to establish potential population effects. We examined the larval phenology of the commercially important Norway lobster (Nephrops norvegicus) and used a larval transport model to examine its effect on simulated transport patterns. Using a model to estimate annual larval release dates based on temperature-dependent embryo incubation, an earlier shift of 17.2 d occurred between 1982-1995 and 2000-2010 in the Irish Sea, similar to an observed empirical shift in phenology of 19.1 d using historical zooplankton data sets. Despite this earlier phenology, temperature-dependent pelagic larval durations were unchanged because the water column to which larvae were released earlier had also warmed. Larval transport simulations in the western Irish Sea indicated that the phenology shift had minimal effects on larval retention and advection distance overall, because major variations were observed only at very early or late stages of the larval season, that is, times when lower proportions of larvae were present. As the western Irish Sea grounds exports small but consistent quantities of larvae to nearby populations, especially off Scotland, it may act as an important source of larvae, especially when retention of native larvae is low. Overall, larval transport tools may indicate grounds that are periodically vulnerable to recruitment failures and offer potentially valuable information in fishery management.

show abstract

Nephrops Species

Cited by 36 publications

References 176 publications

Seasonal nutritional status in Norway lobsters,Nephrops norvegicus(L.): are females nutritionally compromised over the winter?

Seasonal nutritional status in Norway lobsters,Nephrops norvegicus(L.): are females nutritionally compromised over the winter?

The effects of seasonal variation on the nutritional condition ofNephrops norvegicus(Astacidea: Nephropidae) from wild populations in the western Mediterranean

Shift in the larval phenology of a marine ectotherm due to ocean warming with consequences for larval transport

Contact Info

Product

Resources

About