Reproductive biology of the common shrimp Crangon crangon (Decapoda: Crangonidae) in the central Irish Sea

Oh, Chul‐Woong; Hartnoll, Richard G.

doi:10.1007/s00227-003-1205-6

Cited by 65 publications

(58 citation statements)

References 69 publications

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“…Whereas in our data the duration of the gap is typically 2-3 months around September-October, it covers virtually a half year (JulyDecember) in the findings of Oh and Hartnoll (2004). At the same time, the percentage of mature females reported by Oh and Hartnoll (2004) drops to zero or almost zero during July-October. Sexual maturity, once attained, is not reversible as opposed to the cyclic event of egg production and spawning.…”

Section: Maturity Cyclecontrasting

confidence: 61%

“…Dutch waters (Havinga 1930) and the Irish Sea (Oh and Hartnoll 2004). Whereas in our data the duration of the gap is typically 2-3 months around September-October, it covers virtually a half year (JulyDecember) in the findings of Oh and Hartnoll (2004).…”

Section: Maturity Cyclecontrasting

confidence: 50%

“…Indications for two broods (winter and summer) were also found by Oh and Hartnoll (2004) in the Irish Sea. For the Dutch coast Boddeke (1966) argues for two distinct peaks in the production of larvae, the first in January resulting from a spawning in October, and a second peak in March-April.…”

Section: Maturity Cyclementioning

confidence: 63%

“…However, since our ''maturity'' classification is based only on the presence of attached eggs, it was termed ''apparent maturity'', because a female may pass a molting phase without spawning though being mature (''resting''). While Henderson and Holmes (1987) used the same approach (their curve for ovigerous females does only reach 60%), Oh and Hartnoll (2004) included gonadal state in their classification, and arrive at a maturity curve which is somewhat flatter than ours.…”

Section: Maturity Cyclementioning

confidence: 91%

“…Oh and Hartnoll (2004) inspecting gonads and external characteristics, respectively, found transitional stages only in a few percent of the specimens examined. Boddeke (1965), commenting on an analysis of a series of male gonad samples, did not mention the finding of gonads in transition, but rather stated in the discussion of that paper that ''the great majority of female shrimps were of that sex at hatching''.…”

Section: Sex Ratiomentioning

confidence: 92%

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Sex-ratio, seasonality and long-term variation in maturation and spawning of the brown shrimp Crangon crangon (L.) in the German Bight (North Sea)

Siegel

Damm

Neudecker³

2008

Helgol Mar Res

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Aspects of the reproductive and maturation biology of the brown shrimp Crangon crangon (L.) were studied in various subareas of the German Bight (North Sea). The size-specific sex ratio of C. crangon was examined based on length frequency distribution data. The sex ratio for the smallest size groups at which sex was determined was typically around 0.5, indicating an even ratio between males and females. The proportion of females decreased in the 30-45 mm size range. In length classes larger than 50 mm, the proportion of females constantly increases to 100% at around 60 mm total length. We concluded that sex reversal from male to female may not occur in C. crangon. Size at sexual maturity was determined from the proportion of ovigerous females. Size at maturity (L 50 ) was estimated as 55.4 and 62.0 mm total length for spring and winter data, respectively. The seasonal spawning cycle was studied over the period . Between mid February and late June and for size classes larger than 65 mm ovigerous shrimps exceeded 80% and reached up to 100% of the females in the population. This period can be seen as the core spawning season. From early August to early December the proportion of ovigerous shrimps in the female population is very low. Interannual differences in the seasonal process are obvious with a dramatic decline in C. crangon reproductive success in the late 1980s. Various options are discussed for the reasons of the decline and recovery of the reproductive performance.

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Section: Maturity Cyclecontrasting

confidence: 61%

Section: Maturity Cyclecontrasting

confidence: 50%

Section: Maturity Cyclementioning

confidence: 63%

Section: Maturity Cyclementioning

confidence: 91%

Section: Sex Ratiomentioning

confidence: 92%

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Sex-ratio, seasonality and long-term variation in maturation and spawning of the brown shrimp Crangon crangon (L.) in the German Bight (North Sea)

Siegel

Damm

Neudecker³

2008

Helgol Mar Res

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Hierarchical population genetic structure in the commercially exploited shrimp Crangon crangon identified by AFLP analysis

et al. 2006

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Weetman, D., Ruggiero, A., Mariani, S., Shaw, P. W., Lawler, A. R., Hauser, L. (2007). Hierarchical population genetic structure in the commercially exploited shrimp Crangon crangon identified by AFLP analysis. Marine Biology, 151 (2), 565-575.The coastal shrimp Crangon crangon is an ecologically and commercially important species but there is limited knowledge of its genetic population structure. We utilised amplified fragment length polymorphisms (AFLPs) to investigate population differentiation among eight sampling locations comprising paired sites from north- and south-western Britain, the eastern English Channel and the Baltic Sea. Initial AMOVA and cluster analysis suggested strong differentiation, but outlier analysis identified three loci that might be subject to selection, one of which showed significant latitudinal variation in allele frequencies. Following exclusion of these outlier loci, and also of a divergent, genetically-impoverished sample from the UK Bristol Channel, cluster analysis revealed three major groupings, corresponding to geographical regions: western Britain, the eastern English Channel and the Baltic Sea. AMOVA identified significant differentiation both within and among these regions, with similar variation explained by each hierarchical level. C. crangon shows greater genetic structuring than has been found in many decapod crustaceans studied to date, and our results are consistent with unstable population sizes and gene flow restricted by distance and probably also hydrographic features. Further investigation of temporal stability in population structure is required, but broad-scale homogeneity of fishery stocks should not be assumed.Peer reviewe

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Patterns in reproductive dynamics of burrowing ghost shrimp Trypaea australiensis from small to intermediate scales

Rotherham

West

2009

Mar Biol

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Reproductive biology of the common shrimp Crangon crangon (Decapoda: Crangonidae) in the central Irish Sea

Cited by 65 publications

References 69 publications

Sex-ratio, seasonality and long-term variation in maturation and spawning of the brown shrimp Crangon crangon (L.) in the German Bight (North Sea)

Sex-ratio, seasonality and long-term variation in maturation and spawning of the brown shrimp Crangon crangon (L.) in the German Bight (North Sea)

Hierarchical population genetic structure in the commercially exploited shrimp Crangon crangon identified by AFLP analysis

Patterns in reproductive dynamics of burrowing ghost shrimp Trypaea australiensis from small to intermediate scales

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