Theoretical size at the onset of maturity and its density-dependent variability as an option in crustacean fisheries management

Santana, Cesar Augusto da Silva; Lordan, Colm; Power, Anne Marie

doi:10.1093/icesjms/fsab040

Cited by 3 publications

(1 citation statement)

References 47 publications

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“…The value of our data will be incorporated within the Multi-Annual Management Plan for Mediterranean N. norvegicus Stocks [59], with the aim of identifying suitable demographic indicators of recovery. Estimating size at maturity from morphometric data is as an alternative to physiological-based methods; it has the advantage that data are easier and cheaper to obtain, and are less prone to temporal and seasonal biases [18,60].…”

Section: Discussionmentioning

confidence: 99%

Size at Sexual Maturity of Deep-Sea Unexploited Caribbean Metanephrops binghami (Boone, 1927) and Overexploited Mediterranean Nephrops norvegicus (Linnaeus, 1758) Using Morphometric and Gonadal Staging Approaches

Paramo,

Rodriguez,

Zabala

et al. 2024

Fishes

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The deep-sea Caribbean lobster (Metanephrops binghami) and the Norway lobster (Nephrops norvegicus) are Nephropidae species of high commercial interest. Although the first one still remains unexploited, the second is overexploited in the Mediterranean Sea. For effective fisheries management, size at sexual maturity is an essential indicator to protect immature individuals from exploitation. The estimation of this indicator can, however, be biased due to the difficulty of differentiating juveniles from adults by their size structure due to the natural process of molting. This study aims to estimate the size at sexual maturity of M. binghami and N. norvegicus females by comparing the effectiveness of the morphometric method versus the macroscopic evaluation of gonad maturity. Samples of M. binghami were collected from the Colombian Caribbean Sea in August and December 2009, March and May 2010, and August 2020 to May 2021. Samples of N. norvegicus were collected from the northwestern Mediterranean Sea from 2019 to 2022. Similar sizes at sexual maturity were found for M. binghami between the morphometric approach (ranging from 28.6 to 33.9 mm cephalothorax length, CL) and the gonadal staging approach (31.4 mm CL). Conversely, for N. norvegicus, the morphometric approach yielded higher measurements (between 27.2 and 30.4 mm CL) than the gonadal approach (26.0 mm CL). This discrepancy might stem from the intense fishing overexploitation conditions of N. norvergicus, leading to a physiological adaptation that enables earlier gonadal maturation at faster rates than morphometric adaptation. Further research is required to elucidate these discrepancies and the effect of overexploitation on physiological (i.e., mature gonads) and functional maturity (i.e., capacity to brood eggs at a larger size).

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Section: Discussionmentioning

confidence: 99%

Size at Sexual Maturity of Deep-Sea Unexploited Caribbean Metanephrops binghami (Boone, 1927) and Overexploited Mediterranean Nephrops norvegicus (Linnaeus, 1758) Using Morphometric and Gonadal Staging Approaches

Paramo,

Rodriguez,

Zabala

et al. 2024

Fishes

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Are we overthinking management zoning for the Tasmanian southern rock lobster fishery? A size of maturity approach

Bradshaw,

Hartmann,

Gardner

et al. 2024

Fisheries Research

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Temperature drives spatial and temporal variation in the reproductive biology of the blue swimmer crab Portunus armatus A. Milne-Edwards, 1861 (Decapoda: Brachyura: Portunidae)

Johnston

Yeoh

2021

Journal of Crustacean Biology

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Sound fisheries management requires knowledge of how the reproductive biology of targeted species varies over space and time and responds to external drivers. We determined the size at maturity and fecundity of the blue swimmer crab Portunus armatus (A. Milne-Edwards, 1861) (Brachyura: Portunidae) along the west coast of Australia at monthly, annual and interdecadal (1990s versus 2010s) time scales. The size at maturity of females determined by abdominal morphology (carapace width (CW) at 50% maturity (CW50)) was highest in sub-tropical Shark Bay at 26°S (104 mm), and declined latitudinally to temperate Geographe Bay at 34°S (93 mm). A notable exception was in a marine embayment at 32°S (Cockburn Sound), where CW50 was significantly lower than all other locations (83 mm). In contrast, batch fecundity was lower in sub-tropical (830,000 eggs at 127 mm CW) than temperate waters (950,000–990,000 eggs). Temporally, CW50 was significantly higher during January-June (typical growth period, encompassing the warmest months of the year) than during July-December (breeding period), and also differed between months, years, and decades. Positive correlations between water temperature, monthly and annual estimates of CW50, and functional maturity (size at first ovigery), were detected in most locations. Annual CW50 also increased with population density, particularly in locations where abundances and biomass were lowest. Results highlight plasticity in the reproductive biology of this portunid in response to environmental drivers such as temperature. Regular review of such parameters is important for ensuring robust fisheries management and stock assessments.

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Theoretical size at the onset of maturity and its density-dependent variability as an option in crustacean fisheries management

Cited by 3 publications

References 47 publications

Size at Sexual Maturity of Deep-Sea Unexploited Caribbean Metanephrops binghami (Boone, 1927) and Overexploited Mediterranean Nephrops norvegicus (Linnaeus, 1758) Using Morphometric and Gonadal Staging Approaches

Size at Sexual Maturity of Deep-Sea Unexploited Caribbean Metanephrops binghami (Boone, 1927) and Overexploited Mediterranean Nephrops norvegicus (Linnaeus, 1758) Using Morphometric and Gonadal Staging Approaches

Are we overthinking management zoning for the Tasmanian southern rock lobster fishery? A size of maturity approach

Temperature drives spatial and temporal variation in the reproductive biology of the blue swimmer crab Portunus armatus A. Milne-Edwards, 1861 (Decapoda: Brachyura: Portunidae)

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