Gonad development assessment in the Crassostrea angulata: what is the best diet?
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1
MARE, Marine and Environmental Sciences Centre, ESTM, Instituto Politécnico de Leiria, Portugal
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2
IPMA, Instituto Português do Mar e da Atmosfera, Portugal
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3
CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Portugal
Hatchery production, for many shellfish species, particularly in those new for aquaculture, unpredictable and variable reproductive performance is an important limiting factor for the successful seed mass production. The Portuguese oyster Crassostrea angulata, could be considered a recent species in world aquaculture, and so the production and biological aspects remain unknown or poorly understood. In fact a better knowledge and understanding of the changes occurring in gonads of adult specimens should be helpful to improve the reproductive performance during the broodstock conditioning. Broodstock conditioning is an important first step in the process of rearing bivalve seed in hatchery and many factors influences this step, being food the most important. This study gives a description of the effects of the nutritional regimes on sexual maturation of C. angulata, through histological examination of the gonadal tissue. Adult oysters were fed with two different diets, one is formulated fundamentally by flagellates Pavlova lutheri, Isochrysis galbana clone T-ISO and Skeletonema costatum (1:1:1) and other is constituted fundamentally by diatoms S. costatum, Chaetoceros calcitrans and P. lutheri (1:1:1). During conditioning, samples of oysters were collected to perform histological analysis on gonad area, which provided general information on gonad development. Tissue areas were measured using image analysis software. The results obtained in this study indicated that the gonad keeps developing during the whole period of the experiment, being the most effective diet constituted fundamentally by diatoms. Whereas those fed with regime formulated fundamentally by flagellates have an unsuccessfully gonadic development. The results obtained in this study reinforce the idea that the diatom microalgae group is essential in the conditioning of C. angulata broodstock. This information could be used to improve conditioning procedures for the nutritional factors of C. angulata in hatchery.
Keywords:
Bivalves,
Crassostrea angulata,
Hatchery,
Broodstock conditioning,
Microalgae diets,
Gonadal development
Conference:
IMMR | International Meeting on Marine Research 2016, Peniche, Portugal, 14 Jul - 15 Jul, 2016.
Presentation Type:
Poster presentation
Topic:
Aquaculture
Citation:
Anjos
CM,
Baptista
TM,
Joaquim
S,
Ramos
A,
Moura
P and
Matias
D
(2016). Gonad development assessment in the Crassostrea angulata: what is the best diet?.
Front. Mar. Sci.
Conference Abstract:
IMMR | International Meeting on Marine Research 2016.
doi: 10.3389/conf.FMARS.2016.04.00038
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Received:
13 May 2016;
Published Online:
13 Jul 2016.
*
Correspondence:
Miss. Catarina M Anjos, MARE, Marine and Environmental Sciences Centre, ESTM, Instituto Politécnico de Leiria, Peniche, Portugal, cmacastilho@gmail.com