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Effects of Temperature Regime on Broodstock Conditioning of Ruditapes decussatus

Published on Dec 1, 2008in Journal of Shellfish Research1.037
· DOI :10.2983/0730-8000-27.5.1093
J. Ojea3
Estimated H-index: 3
(CIMA: Chartered Institute of Management Accountants),
Antonio J. Pazos14
Estimated H-index: 14
+ 4 AuthorsM. Abad14
Estimated H-index: 14
Abstract
Abstract To optimize the conditioning procedure to obtain better larvae with lower production costs, Ruditapes decussatus broodstock was conditioned at different periods during the year [October (C1), February (C2), and April (C3)] under two different controlled temperature regimes: a constant temperature (CT, 20°C) and a gradual increase in temperature from ambient to 20°C (GT). Samples (30 adult clams) were collected randomly every month from a control group and from each conditioning tank (three tanks for each temperature treatment). A section of the gonad-visceral mass was sampled for gonadal histology and the remaining tissue was used for biochemical analyses. Gonadal developmental stages were determined based on the classification proposed by Wilson and Seed (1974), and fertilized eggs were reared after the method of Walne (1966). In the three conditioning experiments fewer degree-days were required to successfully spawn clams in tanks with the gradual increase of temperature. Clams conditioned in O...
  • References (21)
  • Citations (17)
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This article describes the effects of food availability on the sexual maturation of Ruditapes decussates through histological examination of the gonadal tissue. Three food rations were tested: High (H: 1 mg. organic matter. g live weight –1 .day -1 of the microalgae Isochrysis galbana clone T-ISO), intermediate (I: 0.5 mg OM g live weight -1 day -1 ) and nutritionally restricted (R: 0.25 mg OM g live weight -1 day -1 ). The tests were carried out at a constant temperature of 18°C for a period of...
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A comparative study ofthe reproductive cycle o/'Ruditapes decussatus under natural(South ofTunisia) and con­ trolled conditions (hatchery). The aim of this study was to describe and compare the gametogenic activity of Ruditapes decussatus in situ and in hatchery. Criteria of maturity were characterized and the positive role of conditioning in the suc­ cess of artificial reproduction was underlined. Specimens sampled in the South of Tunisia were conditioned at the experi­ mental station of Monast...
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Abstract Seasonal variations in the body weight and biochemical composition of the bivalve Ruditapes decussatus were studied over a period of 15 months. Separate analyses were made of foot, mantle edge, siphons, gills, adductor muscle and gonad-visceral mass. Variations in weight, body growth, gonad growth and spawning depended on environmental conditions, especially food availability. The gametogenic cycle comprised two phases: a resting phase (November–December) and gametogenesis, including ri...
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