Effects of fishery protection on biometry and genetic structure of two target sea cucumber species from the Mediterranean Sea

González‐Wangüemert, Mercedes; Valente, Sara; Aydın, Mehmet

doi:10.1007/s10750-014-2006-2

Cited by 44 publications

(22 citation statements)

References 35 publications

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“…This trend could be found in species or populations under fishing pressure (Pérez-Ruzafa et al, 2006;González-Wangüemert et al, 2015). The absence in CT of shared haplotypes (as COI-23 and COI-3) that were present among all Western Mediterranean populations (AB, CG + CF, AL and VL) may be due to the loss of haplotypes that occurs because of the fishing pressure or may suggest restricted gene flow and isolation with respect to the other populations.…”

Section: Discussionmentioning

confidence: 89%

Genetic differentiation among Parastichopus regalis populations from Western Mediterranean Sea: potential effects of its fishery and current connectivity.

Maggi

González‐Wangüemert

2015

Medit. Mar. Sci.

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Parastichopus regalis (Cuvier, 1817) is the most expensive seafood product on the Catalonian market (NE Spain), with prices at approximately 130 €/Kg (fresh weight). Despite its ecological and economic importance, biological and genetic information on this sea cucumber species is scarce. Here, we provide both the first insight on the genetic structure of P. regalis using sequences of cytochrome oxidase I (COI) and 16S genes and a morphological description of its population. Individual sea cucumbers were collected in six locations along the Spanish Mediterranean coast, including an area under fishery pressure (Catalonia). We found high haplotype diversity and low nucleotide diversity for both genes, with higher levels of genetic diversity observed in the COI gene. The population pairwise fixation index (F ST ), AMOVA and correspondence analysis (CA) based on the COI gene revealed significant genetic differentiation among some locations. However, further analysis using nuclear markers (e.g., microsatellites) is necessary to corroborate these results. Moreover, the genetic and morphological data may indicate fishery effects on the Catalonian population with a decrease in the size and weight averages and lower genetic diversity compared with locations that lack fishery pressure. For the appropriate management of this species, we suggest the following: 1) accurately assessing the stock status along the Spanish coasts; 2) studying the reproductive cycle of this target species and the establishment of a closed fishery season according to the reproductive cycle; and 3) establishing protected areas (i.e., not take zones) to conserve healthy populations and favour recruitment in the nearby areas.

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Section: Discussionmentioning

confidence: 89%

Genetic differentiation among Parastichopus regalis populations from Western Mediterranean Sea: potential effects of its fishery and current connectivity.

Maggi

González‐Wangüemert

2015

Medit. Mar. Sci.

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“…The increasing demand from Asian markets has led to the rapid exploitation of new fisheries elsewhere, such as the Mediterranean area (Antoniadou & Vafidis, ; González‐Wangüemert, Valente & Aydin, ) where the fishing effort for holothuroids is on the increase. In Turkish waters alone, there are approximately 120 active fishing vessels with a harvest that ranges from 720,000 to 1,080,000 sea cucumbers per day (González‐Wangüemert, Aydin & Conand, ; González‐Wangüemert, Valente, Henriques, Domínguez‐Godino & Serrão, ).…”

Section: Introductionmentioning

confidence: 99%

Spawning and rearing ofHolothuria tubulosa: A new candidate for aquaculture in the Mediterranean region

et al. 2017

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Holothuria tubulosa (Gmelin, 1788) has recently shown an increased demand in Asian markets, becoming one of the intensively exploited holothurian species in the Mediterranean Sea. A risk is that over-harvesting is likely affecting both the species' natural stocks and the benthic communities. In this scenario, sea ranching and restocking through aquaculture could assist in mitigating its overexploitation. This study is the first to demonstrate the successful artificial breeding and rearing of H. tubulosa, and its consequent potential as a new species for the Mediterranean aquaculture industry. Here we describe the spawning induction, larval development and early juvenile growth in hatchery cultures, aimed at developing a spawning and rearing protocol for this species. The trials were conducted from July to October in both 2014 and 2015. Holothuria tubulosa was induced to spawn by testing four different methods. Thermal stimulation plus thermal shock emerged as the most efficient method to obtain active and healthy gametes. Larval development in H. tubulosa progressed through five stages, reaching the juvenile stage in 27 days.Two different microalgal feeding regimens were tested for larval breeding. Under the best feeding conditions, 7% of the larvae metamorphosed into settled juveniles, adhering to artificial substrates previously conditioned with benthic biofilm. Our results indicate that H. tubulosa shows good performance in hatchery rearing during the larval phases, indicating that this species could be a new candidate for aquaculture in the Mediterranean region, both for production and restocking proposes. K E Y W O R D SHolothuria tubulosa, larval feeding, larval rearing, mariculture, sea cucumber, spawning

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“…Catches of sea cucumbers from the Mediterranean Sea and NE Atlantic Ocean have been increased recently due to overexploitation of species inhabiting the Pacific and Indian oceans (González-Wangüemert, Aydin, & Conand, 2014;González-Wangüemert, Valente, & Aydin, 2015). Mainly, six species are caught in this geographical area (González-Wangüemert, Valente, Henriques, Domínguez-Godino, & Serrão, 2016): Holothuria polii (Delle Chiaje, 1824), Holothuria tubulosa (Gmelin, 1791), Holothuria mammata (Grube, 1840), Holothuria arguinensis (Koehler & Vaney, 1906), Holothuria sanctori (Delle Chiaje, 1823) and Holothuria forskali (Delle Chiaje, 1823).…”

Section: Introductionmentioning

confidence: 99%

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Siegenthaler¹,

Cánovas²,

Wanguemert³

2017

Turk. J. Fish. Aquat. Sci.

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Holothuria mammata is one of the new target species from the Mediterranean and Atlantic. Usually, it inhabits rocky bottoms, staying in crevices and holes during the day and leaving them in the night for feeding on sandy bottoms. However, it can be found in unusual habitats such as seagrass with diurnal and nocturnal feeding. This study provides information for the first time on the behaviour, density and small scale distribution of H. mammata in a seagrass habitat from Ria Formosa (S Portugal). To reach these aims, a mark/recapture methodology was used. Abundance was estimated through R statistical software v.2.15.3 (package "Rcapture"). The minimum area method was applied in GRASS GIS v.6.4.2 for home range. Size distribution was estimated applying a Shapiro-Wilk test. Rayleigh test for randomness was applied to study the directionality of movements. A circular one-way ANOVA was used to test for differences in movement direction. Capture probability was higher on seagrass than sand and the total length of the individuals ranged from 13 to 25 cm. Movement speed was between 4.7 and 14.7 m day -1 . Movements were not directional. H. mammata differs in its behaviour from the related Holothuria arguinensis occurring in the same habitat.

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Effects of fishery protection on biometry and genetic structure of two target sea cucumber species from the Mediterranean Sea

Cited by 44 publications

References 35 publications

Genetic differentiation among Parastichopus regalis populations from Western Mediterranean Sea: potential effects of its fishery and current connectivity.

Genetic differentiation among Parastichopus regalis populations from Western Mediterranean Sea: potential effects of its fishery and current connectivity.

Spawning and rearing ofHolothuria tubulosa: A new candidate for aquaculture in the Mediterranean region

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