Browsing by Author "Mendes, Ana Candeias"
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- PRODUÇÃO DE LARVAS E JUVENIS DE OURIÇOS-DO-MAR (Paracentrotus lividus) NA ESTAÇÃO PILOTO DE PISCICULTURA DE OLHÃO (EPPO)Publication . Mendes, Ana Candeias; Araújo, João; Soares, Florbela; Pousão-Ferreira, Pedro; Instituto Português do Mar e da AtmosferaThe sea urchin is a marine resource with increasing demand and commercial value, mainly in the international markets. The interest for this species comes mainly from their gonads (roe) reaching very high prices due to its value as a product of gourmet cuisine. Due to the growing demand and consequent capture a decrease of the natural stocks has been observed. The sustainable consumption of this resource requires the development of aquaculture production satisfying the international market. Production trials of sea urchins (Paracentrotus lividus) at IPMA started using breeders captured off the Algarve coast in 2016 and conditioned in EPPO facilities - Aquaculture Research Station of Olhão, fed with macroalgae Ulva spp. and corn grain (Zea mays). Spawning induction was obtained by injection of magnesium chloride 0.5 M in the celomic space by the peristomial membrane. Fertilization and embryonic development were accompanied by microscope observation. During the planctonic stage the sea urchins larvae were fed with a mixture of different microalgae in order to assure the nutritional requirements. A survival rate of 30% was observed at 15DAE (days after hatch). At age 27DAE metamorphosis and fixation was verified. After reaching the benthic stage the sea urchins were fed with the same mixture of microalgae plus macroalgae Ulva spp. After 4 months of age sea urchins were fed exclusively with macroalgae and macroalgae and corn. At 7 months of age (221DAE) sea urchins fed with macroalgae showed a higher somatic growth (test diameter), however individuals fed with seaweed and corn had a better GSI (gondosomatic index).