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Effect of Temperature on Embryonic Development, Larval Viability and Biomarkers in the First Stages of Life of Octopus Vulgaris (Cuvier, 1797)
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Effect of Temperature on Embryonic Development, Larval Viability and Biomarkers in the First Stages of Life of Octopus Vulgaris (Cuvier, 1797)
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Effect of Temperature on Embryonic Development, Larval Viability and Biomarkers in the First Stages of Life of Octopus Vulgaris (Cuvier, 1797)
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Dissertation
Effect of Temperature on Embryonic Development, Larval Viability and Biomarkers in the First Stages of Life of Octopus Vulgaris (Cuvier, 1797)
2015
Overview
Octopus vulgaris, rearing/production presents several problems, mainly during the first stages, from the incubation of the eggs to the rearing of paralarvae. In the last years, several research groups have been doing an effort to produce O. vulgaris in aquaculture (large scale), focused on larval rearing phase, in order to solve these bottlenecks.In this sense, this study aims to analyse the effect of different temperatures on common octopus embryonic development from one single female brood; as well as, larval viability and biomarkers of growth, physiological stress, antioxidant defences and neuronal activity (RNA/DNA, HSP70, GST and AChE) respectively, in the first stages of Octopus vulgaris life.O. vulgaris eggs from the same female brood were incubated from stage XV to hatchlings at two different temperatures (19ºC and 22ºC), and then they were maintained at room temperature (22ºC ± 1) for 14 days. Survival, specific growth rate, biomass and dry weight were measured over time at the two temperatures. Samples from 0 and 14 days were taken in order to analyse biomarkers individually. Only HSP70 was analysed using a pool of 7-8 paralarvae.The results showed differences between temperatures in terms of survival and specific growth rate. RNA/DNA ratios and GST (0 and 14 days), and HSP70 results also showed differences between temperatures and ages (0, 7 and 14 days). No significant differences were found in AChE activity between groups (age and temperatures). The results point out at the RNA/DNA ratio, GST and HSP70 as sensitive biomarkers for growth, thermal stress and antioxidant defences in paralarvae. However, growth and temperature did not alter the neurotransmission system of the paralarvae.
