Browsing by Author "Dominguez-Godino, Jorge A."
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- Improving the fitness of Holothuria arguinensis larvae through different microalgae dietsPublication . Dominguez-Godino, Jorge A.; Gonzalez-Wanguemert, MercedesDevelopment and design of adequate feeding protocols on sea cucumber larvae are necessary for improvements on larvae growth, survival and production of competent juveniles. This work assessed the Holothuria arguinensis larvae growth and survival, fed with three different single microalgae diets of Chaetoceros calcitrans, Isochrysis galbana and Tetraselmis chui, and two microalgae diets based on a combination of C. calcitrans and T. chuii (C:T 1:1) and C. calcitrans, T. chuii and I. galbana (C:T:I 1:1:1) during 2 months. Holothuria arguinensis larvae fed with T:C:I, showed higher survival and larger larval and stomach sizes than the ones fed with the other diets. Comparing the results obtained from the single diets, H. arguinensis larvae fed with I. galbana grew and survived better during the first 5 days. However, higher growth was obtained on the larvae fed with C. calcitrans from day 5 to day 12 since this day, larvae fed with T. chuii showed the largest size. These results could be related to the different microalgae size and morphology, in addition to the nutritional value of the different microalgae used. However, no competent larvae that metamorphosed into doliolaria were obtained during this experiment. The tanks used were transparent, which could be causing light stress to the larvae, since competent larvae were obtained in opaque production tanks in our aquaculture installations during the same time period. The combined diet of C. calcitrans, T. chuii and I. galbana (C:T:I) could improve the growth and larvae competency of H. arguinensis.
- Profitability of the Mediterranean and NE Atlantic new target sea cucumber species: some repercussions for their fisheries managementPublication . Gonzalez-Wanguemert, Mercedes; Dominguez-Godino, Jorge A.; Aydin, MehmetThe term profitability can be understood as the ratio in percentage between fresh weight of animals and the dry weight of the obtained beche-de-mer depending on the body wall thickness of sea cucumbers and water content. Specimens decrease their weight and length considerably, when they are processed. However, scarce information about profitability of commercial sea cucumber from Mediterranean and NE Atlantic has been published until now. In this study, we focused on Holothuria tubulosa, Holothuria polii, Holothuria mammata and Holothuria arguinensis. For most of the species considered, a good lineal regression was found between eviscerated length (EL) vs eviscerated weight (EW), and EW vs dried weight (DW)