Population Index and Growth Estimation Based On SLW Index of the Sea Cucumber (Holothuria arguinensis Koehler &amp; Vaney, 1906) in the Moroccan Waters of the Atlantic Coast

Haddi, Imane; Benzha, F.; Maanan, Mehdi; Siddique, Saima; Rhinane, Hassan; Charouki, Najib; Zidane, Hakima

doi:10.1007/s41208-021-00362-9

Cited by 3 publications

(2 citation statements)

References 48 publications

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“…H. arguinensis presented a higher growth rate (K = 0.35 and L∞ = 53.03) than what was already reported for the Atlantic coast of Morocco (K = 0.17 and L∞ = 25.96; 0.29 and L∞ = 25.44; Haddi et al, 2021), but revealed a much slower growth rate than the populations at Ria Formosa, south of Portugal (K = 0.88 and L∞ = 69.90; Olaya-Restrepo et al, 2018). It is noteworthy, however, that the study for the Atlantic coast of Morocco used a recalculated length, based on both length and width, and this should be borne in mind when making a comparison.…”

Section: Discussioncontrasting

confidence: 49%

Estimating age and growth parameters for three commercial NE-Atlantic sea cucumbers, Holothuria mammata, H. forskali and H. arguinensis, in a marine protected area

Azevedo e Silva,

Brito,

Simões

et al. 2024

Front. Mar. Sci.

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Sea cucumbers, integral components of benthic ecosystems, have become subjects of scientific scrutiny owing to their intricate morphology and ecological importance. Due to increasing demand, several species of these echinoderms have become overexploited. As a consequence, NE-Atlantic species became new targets for the international markets. There is a vital need for comprehensive biological data to establish and enhance holothurian fisheries management. In the absence of such data, there is a risk of ineffective fisheries regulations, particularly for susceptible commercial species in the NE-Atlantic, which could lead to overexploitation. Establishing effective fisheries regulations requires a foundation of fundamental biological information, such as growth rates from target populations. This work aims to determine the growth parameters for three commercial sea cucumber species from the NE-Atlantic, in a marine protected area, Holothuria mammata, H. forskali and H. arguinensis. This presents a challenge, as sea cucumbers lack significant calcified structures for age determination, and assessing size is complicated because of their body size plasticity. Thus, a von Bertalanffy model was fitted to length-frequency data using the ELEFAN method with the simulated annealing procedure. Underwater length measurements of the three sea cucumber species, in a relaxed state, were systematically recorded over a span of 18 months, with measurements taken every 1.5 months. The results provide the growth parameters of each species. Models considering seasonal growth were better fits to the data. The three species had different growth rates and periods of no growth coincided with the reproductive season. Mortality was lower for the species growing slower. This is crucial information to support decision-making processes regarding stock management, such as setting limits to fisheries considering stock condition associated with environmental variability.

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Section: Discussioncontrasting

confidence: 49%

Estimating age and growth parameters for three commercial NE-Atlantic sea cucumbers, Holothuria mammata, H. forskali and H. arguinensis, in a marine protected area

Azevedo e Silva,

Brito,

Simões

et al. 2024

Front. Mar. Sci.

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“…This area is under the upwelling caused by changing air temperatures in response to 'Alizés' winds from that blow parallel to the coastline. These winds generate upwelling, the most important hydrological feature in the region (Bayed, 2003;Haddi et al 2022).…”

Section: Study Areamentioning

confidence: 99%

Length-weight relationship, reproductive aspects and condition factor of the elegant cuttlefish Sepia elegans Blainville, 1827 off the northern coast of Morocco, Eastern Atlantic Ocean

2022

Egypt. J. of Aquatic Biolo. and Fish.

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Sepia elegans (Blainville, 1827), commonly known as the elegant cuttlefish, is one of the most important cephalopods in terms of landed weight, fished by a coastal trawler off the northern Atlantic coast of Morocco (MAIA, fishing statistics data). National captives' elegant cuttlefish in the northern Moroccan coast is linked to the number of active coastal units, up to eighty active units' land in the port of Casablanca. In 2020, the productivity of the elegant cuttlefish was 110.27 Tonnes, while the port of Casablanca with 92%, i.e. 101.51 Tonnes of the total landings (MAIA, fishing statistics data).

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Length–Weight Relationships of the Prized Sea Cucumber Holothuria lessoni from In Situ and Ex Situ Measurements

Djenidi,

Purcell,

Thornton

et al. 2024

JMSE

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Fisheries science draws on morphometric data for stock assessments. Length–weight relationships are essential for estimating body weight from length measurements taken either underwater (in situ) or out of the water (ex situ). We examined morphometric models for the high-valued sea cucumber, Holothuria lessoni. From 77 specimens captured in 2024 (mean weight ± SD: 1774 ± 372 g), we measured body length and width in situ and ex situ, then weighed the animals ex situ. We compared morphometric models using four biometric parameters. The fitted relationships were more statistically significant (p < 0.001) when using in situ measurements compared to ex situ measurements. The length–weight relationship from our study was compared with those from two previous studies on the same species at the same location. Each study generated significantly (p < 0.001) different length–weight relationships. These findings suggest that length–weight relationships should be re-evaluated at regular intervals, as they may evolve over time. Our study indicates that estimation of body weight from length (and width) must rely on established relationships corresponding to whether the measurements are made in situ or ex situ. Our results suggest that in situ measurements could provide more reliable data for length–weight relationships in certain holothuroids.

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Population Index and Growth Estimation Based On SLW Index of the Sea Cucumber (Holothuria arguinensis Koehler & Vaney, 1906) in the Moroccan Waters of the Atlantic Coast

Cited by 3 publications

References 48 publications

Estimating age and growth parameters for three commercial NE-Atlantic sea cucumbers, Holothuria mammata, H. forskali and H. arguinensis, in a marine protected area

Estimating age and growth parameters for three commercial NE-Atlantic sea cucumbers, Holothuria mammata, H. forskali and H. arguinensis, in a marine protected area

Length-weight relationship, reproductive aspects and condition factor of the elegant cuttlefish Sepia elegans Blainville, 1827 off the northern coast of Morocco, Eastern Atlantic Ocean

Length–Weight Relationships of the Prized Sea Cucumber Holothuria lessoni from In Situ and Ex Situ Measurements

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