The influence of different microalgal diets on <i>Crassostrea angulata</i> (Lamarck, 1819) broodstock conditioning

The Portuguese oyster <i>Crassostrea angulata</i> shows great potential in oyster farming. In Europe, pure populations of this species were observed only in the southern coasts of Portugal and Spain, namely in Rio Sado, Rio Mira and Guadalquivir. The conservation of <i>C. angulata&...

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Main Author: Catarina Anjos
Format: Article
Language:English
Published: Frontiers Media S.A. 2014-06-01
Series:Frontiers in Marine Science
Subjects:
Online Access:http://journal.frontiersin.org/Journal/10.3389/conf.fmars.2014.02.00138/full
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spelling doaj-51ea3ca3b8c945d18257022af94ffd5c2020-11-24T22:29:41ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452014-06-01110.3389/conf.fmars.2014.02.0013897679The influence of different microalgal diets on <i>Crassostrea angulata</i> (Lamarck, 1819) broodstock conditioningCatarina Anjos0Catarina Anjos1Escola Superior de Turismo e Tecnologia do Mar - Instituto Politécnico de LeiriaInstituto Português do Mar e AtmosferaThe Portuguese oyster <i>Crassostrea angulata</i> shows great potential in oyster farming. In Europe, pure populations of this species were observed only in the southern coasts of Portugal and Spain, namely in Rio Sado, Rio Mira and Guadalquivir. The conservation of <i>C. angulata</i> populations is important in the context of production diversification and biodiversity preservation. In this way the zootechnological development for seed hatchery production is extremely important. Broodstock conditioning is a key step in the process of rearing bivalve in hatchery. Many factors regulate the reproductive cycle, being food the most important. However the influence of the nutritional quality of different phytoplankton on sexual maturation has been poorly explored. To evaluate the effects of different diets on <i>C. angulata</i> sexual maturity, broodstock were conditioned with different food regimes: Diet 1: bi-specific combination of <i>Pavlova lutheri</i> and <i>Isochrysis galbana</i> clone T-ISO (1:1); Diet 2: tri-specific combination of <i>P. lutheri</i>, <i>I galbana</i> clone T-ISO and <i>Skeletonema constatum</i> (1:1:1); Diet 3: bi-specific combination of <i>S. constatum</i> and <i>Chaetoceros calcitrans</i> (1:1) and Diet 4: tri-specific combination of <i>P. lutheri, S. constatum</i> and <i>C. calcitrans</i> (1:1:1). During conditioning, condition index and gonad histological analysis were performed. Results showed heterogeneity between diets. At the beginning of conditioning 60% of individuals were in resting (stage 0), 30% were males in early gametogenesis (stage I) and 10% were females in mature stage (stage III). At the end of the conditioning, the most effective diet was the Diet 3 (60 % of mature oysters with a mean condition index value of 2.83±0.95). Whereas those fed with Diet 1 have an unsuccessfully gonadic development, with 80% of individuals in resting stage. Indeed, the condition index, in Diet 1 decreased during the conditioning period. The results obtained in this study reinforce the idea that the diatom microalgae group is essential in the conditioning of <i>C. angulata</i> broodstock. This work constitute an important first step in the hatchery <i>C. angulata</i> broodstock nutrition and a prerequisite for future work on improvement of broodstock conditioning and the optimization of feeding practices that will maximize the conditioning phase and minimize cost in aquaculture hatcheries.http://journal.frontiersin.org/Journal/10.3389/conf.fmars.2014.02.00138/fullHistologyBivalvescondition indexCrassostrea angulataHatcheryBroodstock conditioningAlgal diets
collection DOAJ
language English
format Article
sources DOAJ
author Catarina Anjos
Catarina Anjos
spellingShingle Catarina Anjos
Catarina Anjos
The influence of different microalgal diets on <i>Crassostrea angulata</i> (Lamarck, 1819) broodstock conditioning
Frontiers in Marine Science
Histology
Bivalves
condition index
Crassostrea angulata
Hatchery
Broodstock conditioning
Algal diets
author_facet Catarina Anjos
Catarina Anjos
author_sort Catarina Anjos
title The influence of different microalgal diets on <i>Crassostrea angulata</i> (Lamarck, 1819) broodstock conditioning
title_short The influence of different microalgal diets on <i>Crassostrea angulata</i> (Lamarck, 1819) broodstock conditioning
title_full The influence of different microalgal diets on <i>Crassostrea angulata</i> (Lamarck, 1819) broodstock conditioning
title_fullStr The influence of different microalgal diets on <i>Crassostrea angulata</i> (Lamarck, 1819) broodstock conditioning
title_full_unstemmed The influence of different microalgal diets on <i>Crassostrea angulata</i> (Lamarck, 1819) broodstock conditioning
title_sort influence of different microalgal diets on <i>crassostrea angulata</i> (lamarck, 1819) broodstock conditioning
publisher Frontiers Media S.A.
series Frontiers in Marine Science
issn 2296-7745
publishDate 2014-06-01
description The Portuguese oyster <i>Crassostrea angulata</i> shows great potential in oyster farming. In Europe, pure populations of this species were observed only in the southern coasts of Portugal and Spain, namely in Rio Sado, Rio Mira and Guadalquivir. The conservation of <i>C. angulata</i> populations is important in the context of production diversification and biodiversity preservation. In this way the zootechnological development for seed hatchery production is extremely important. Broodstock conditioning is a key step in the process of rearing bivalve in hatchery. Many factors regulate the reproductive cycle, being food the most important. However the influence of the nutritional quality of different phytoplankton on sexual maturation has been poorly explored. To evaluate the effects of different diets on <i>C. angulata</i> sexual maturity, broodstock were conditioned with different food regimes: Diet 1: bi-specific combination of <i>Pavlova lutheri</i> and <i>Isochrysis galbana</i> clone T-ISO (1:1); Diet 2: tri-specific combination of <i>P. lutheri</i>, <i>I galbana</i> clone T-ISO and <i>Skeletonema constatum</i> (1:1:1); Diet 3: bi-specific combination of <i>S. constatum</i> and <i>Chaetoceros calcitrans</i> (1:1) and Diet 4: tri-specific combination of <i>P. lutheri, S. constatum</i> and <i>C. calcitrans</i> (1:1:1). During conditioning, condition index and gonad histological analysis were performed. Results showed heterogeneity between diets. At the beginning of conditioning 60% of individuals were in resting (stage 0), 30% were males in early gametogenesis (stage I) and 10% were females in mature stage (stage III). At the end of the conditioning, the most effective diet was the Diet 3 (60 % of mature oysters with a mean condition index value of 2.83±0.95). Whereas those fed with Diet 1 have an unsuccessfully gonadic development, with 80% of individuals in resting stage. Indeed, the condition index, in Diet 1 decreased during the conditioning period. The results obtained in this study reinforce the idea that the diatom microalgae group is essential in the conditioning of <i>C. angulata</i> broodstock. This work constitute an important first step in the hatchery <i>C. angulata</i> broodstock nutrition and a prerequisite for future work on improvement of broodstock conditioning and the optimization of feeding practices that will maximize the conditioning phase and minimize cost in aquaculture hatcheries.
topic Histology
Bivalves
condition index
Crassostrea angulata
Hatchery
Broodstock conditioning
Algal diets
url http://journal.frontiersin.org/Journal/10.3389/conf.fmars.2014.02.00138/full
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