Sea cucumbers research in the Mediterranean and the Red Seas

Mohsen, Mohamed; Yang, Hongsheng

doi:10.1016/b978-0-12-824377-0.00001-3

Cited by 3 publications

(2 citation statements)

References 60 publications

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“…Almost all sea cucumbers are broadcast spawners with external fertilization that present an annual or bi-annual maturation season (Mercier and Hamel, 2009;Mohsen and Yang, 2021). With a few exceptions of hermaphrodite species, they are generally gonochoric that leak in sexual dimorphisms (Smiley et al, 1991;Mercier and Hamel, 2009).…”

Section: Life History and Population Dynamics Of Sea Cucumbersmentioning

confidence: 99%

Biology, ecology and management perspectives of overexploited deposit-feeders sea cucumbers, with focus on Holothuria tubulosa (Gmelin, 1788)

et al. 2021

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The increasing harvesting of low trophic level organisms is rising concern about the possible consequences on the ecosystem functioning. In particular, the continuous demand of sea cucumbers from the international market lead to the overexploitation of either traditionally harvested and new target species, including the Mediterranean ones. Sea cucumbers are mostly deposit feeders able to consume sedimentary organic matter and, thus, are ideal candidate for the remediation of eutrophicated sediments, like those beneath aquaculture plants. Breeding and restocking of overexploited sea cucumbers populations are well established practice for Indo-Pacific species like Holothuria scabra and Apostichopus japonicus. Some attempts have been also made for the Mediterranean species Holothuria tubulosa, but, so far, the adaptation of protocols used for other species presented several issues. We here summarize narratively the available information about sea cucumbers rearing protocols with the aim of identifying their major flaws and gaps of knowledge and fostering research about new triggers for spawning and feasible protocols to reduce the high mortality of post-settlers.

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Section: Life History and Population Dynamics Of Sea Cucumbersmentioning

confidence: 99%

Biology, ecology and management perspectives of overexploited deposit-feeders sea cucumbers, with focus on Holothuria tubulosa (Gmelin, 1788)

et al. 2021

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“…Sea cucumber species are generally gonochoric, only sporadically hermaphrodites, and are mainly broadcast spawners (e.g. Hyman, 1955;Smiley et al, 1988;Smiley, 1990;Smiley et al, 1991;Mohsen and Yang, 2021). The maturation process of gametes seems to be controlled by either exogenous or endogenous factors.…”

Section: Introductionmentioning

confidence: 99%

New insights upon the reproductive biology of the sea cucumber Holothuria tubulosa (Echinodermata, Holothuroidea) in the Mediterranean: Implications for management and domestication

et al. 2022

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Holothuria tubulosa is one of the most common sea cucumber species inhabiting the Mediterranean Sea. Due to its commercial interest for the international market, it has been harvested without proper management causing the overexploitation of its stocks. Inadequate management is also caused by lack of information on basic biology and ecology not allowing the estimating of the species vulnerability and resilience to growing anthropogenic pressures. In this paper, we have investigated basic life-history traits of H. tubulosa (population structure and reproductive cycle) in a population of Central-Western Mediterranean (Sardinia, Italy). A macroscopic maturity scale for both sexes was defined through an instrumental colorimetric analysis of the gonads and the ramification level of the gonad’s tubules, subsequently confirmed by histological analysis. The seasonal trend of the Gonado-Somatic Index, the changes in color of the gonads and tubules ramification indicated that the spawning period of H. tubulosa was concentrated in summer with a peak in late August, closely related to the increase in water temperature. A synchronous development of the gonads, with a unique and short reproductive event during the year, was also detected. In conclusion, this study provides new evidence on the biological and ecological features of H. tubulosa, essential data for developing a scientifically-based stock assessment as well as conservative management at a local scale. Finally, we provided basic information for the domestication of broodstock in a conservative hatchery.

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Reproductive ecology of free‐ranging striped hyena Hyaena hyaena in central Israel

Hadad,

Balaban,

Kosicki

et al. 2024

Ecological Research

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The striped hyena is one of the most secretive and enigmatic mammal species. Despite some success in describing their distribution and analyzing population trends, further understanding of the factors affecting reproductive success is needed. Therefore, we present the first analysis of the reproductive success of this species in the wild. We measured the reproductive success of female striped hyenas in at least one litter over 15 breeding seasons. We inspected 33 dens with 67 breeding events during this time and recorded 151 young hyenas. The dens were inhabited for an average of 2 years, with litter sizes ranging from 1 to 4 per reproductive female and most young born between January and June. We also found that litter size was positively associated with lowland areas and shrubs near the den. Despite methodological limitations that we could not overcome given the enigmatic nature of this species, our discovery is crucial because we have shown that reproductive success depends on the habitat in which dens are located, thus ensuring consistent reproductive success over the long‐term cycle.

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Sea cucumbers research in the Mediterranean and the Red Seas

Cited by 3 publications

References 60 publications

Biology, ecology and management perspectives of overexploited deposit-feeders sea cucumbers, with focus on Holothuria tubulosa (Gmelin, 1788)

Biology, ecology and management perspectives of overexploited deposit-feeders sea cucumbers, with focus on Holothuria tubulosa (Gmelin, 1788)

New insights upon the reproductive biology of the sea cucumber Holothuria tubulosa (Echinodermata, Holothuroidea) in the Mediterranean: Implications for management and domestication

Reproductive ecology of free‐ranging striped hyena Hyaena hyaena in central Israel

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