Duration of synchronous egg cleavage cycles at different temperatures in Siberian sturgeon (Acipenser baerii)

Gisbert, Enric; Williot, Patrick

doi:10.1046/j.1439-0426.2002.00374.x

Cited by 12 publications

(8 citation statements)

References 7 publications

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“…Siberian sturgeon is an endangered species, which began to undergo a sharp decline in the 1930s (years in which the demand was particularly higher) and continues to decline nowadays. The success and diffusion of Siberian sturgeon farming are due to the great rusticity, the reduced oxygen demand already in the juvenile phase, and the high quality of the derived products (caviar, meat, and skin) [41]. However, the early larval stages still present relevant mortalities, and little studies have been performed concerning the effects of the environmental factors.…”

Section: Discussionmentioning

confidence: 99%

How Different Stocking Densities Affect Growth and Stress Status of Acipenser baerii Early Stage Larvae

Aidos

Cafiso

Serra

et al. 2020

Animals

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In the present study, a multidisciplinary approach was used in order to evaluate growth, muscle development, and stress status in Siberian sturgeon Acipenser baerii larvae at schooling (T1) and complete yolk sac absorption (T2), reared at three stocking densities (low, medium, and high). Larvae growth, morphological muscle development, and whole-body cortisol levels were assessed. The expression of genes involved in the growth process (igf1 and igf2), in the myogenesis (myog), and in the regulation of cellular stress (glut1, glut2, glut4, and hsp70) was analyzed using a quantitative PCR. Larvae reared at lower densities showed a higher Specific Growth Rate and showed a physiological muscle development. Cortisol levels were low and did not differ significantly, both in different time sampling and across densities, suggesting that either the considered densities are not stressors in this species in the early stages of development or the hypothalamus-pituitary-adrenal (HPA) axis is not yet fully mature. Gene expression of glut1, igf1, and igf2 showed an up-regulation in both developmental stages at all the rearing densities considered, while myog significantly up-regulated at T1 at the highest density. Considering all of the results, it would seem that lower densities should be used in these stages of development, as these showed a higher growth rate, even if it is not economically feasible in commercial hatcheries. Therefore, choosing an intermediate stocking density could be a good compromise between larval performance and economical feasibility.

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Section: Discussionmentioning

confidence: 99%

How Different Stocking Densities Affect Growth and Stress Status of Acipenser baerii Early Stage Larvae

Aidos

Cafiso

Serra

et al. 2020

Animals

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“…Water was saturated with O 2 throughout the trial (>8 mg/L) in all incubators, pH values were within the range described for this species in this stage of development. 15 Eggs and larvae were exposed to an artificial photoperiod regime of 12L:12D. Along the entire experimental period after hatching the larvae utilized the nutrients of their yolk sac and were not fed any exogenous food.…”

Section: Methodsmentioning

confidence: 99%

“… 13 In addition, fish larvae may appear less tolerant than the adults to temperature variations, 14 especially in critical moments of larvae development. According to Gisbert and Williot, 15 after hatching, Siberian sturgeon shows benthic behaviour, then aggregates into schools. Normal schooling behaviour in this species can be used as a quality condition similarly in coregonid species.…”

Section: Introductionmentioning

confidence: 99%

Effects of different rearing temperatures on muscle development and stress response in the early larval stages of Acipenser baerii

et al. 2017

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The present study aims at investigating muscle development and stress response in early stages of Siberian sturgeon when subjected to different rearing temperatures, by analysing growth and development of the muscle and by assessing the stress response of yolk-sac larvae. Siberian sturgeon larvae were reared at 16°C, 19°C and 22°C until the yolk-sac was completely absorbed. Sampling timepoints were: hatching, schooling and complete yolk-sac absorption stage. Histometrical, histochemical and immunohistochemical analyses were performed in order to characterize muscle growth (total muscle area, TMA; slow muscle area, SMA; fast muscle area, FMA), development (anti-prolif erating cell nuclear antigen -PCNA or anticaspase) as well as stress conditions by specific stress biomarkers (heat shock protein 70 or 90, HSP70 or HSP90). Larvae subjected to the highest water temperature showed a faster yolk-sac absorption. Histometry revealed that both TMA and FMA were larger in the schooling stage at 19°C while no differences were observed in the SMA at any of the tested rearing temperatures. PCNA quantification revealed a significantly higher number of proliferating cells in the yolk-sac absorption phase at 22°C than at 16°C. HSP90 immunopositivity seems to be particularly evident at 19°C. HPS70 immunopositivity was never observed in the developing lateral muscle.

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“…hatching time), and energy reserves. According to Gisbert & Williot (2001a), Siberian sturgeon embryos are viable over a wide range of temperatures (8-20 C), but temperatures from 12·5 to 20 C are the most favourable for embryonic development. Although high water temperature increases egg developmental rate, which reduces incubation time, temperatures higher than 13-14 C promote fungus development and reduce hatching success.…”

Section: Environmental Conditionsmentioning

confidence: 99%

Advances in the larval rearing of Siberian sturgeon

Gisbert¹,

Williot²

2002

Journal of Fish Biology

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Since first large-scale attempts to culture sturgeon from the larval stage were carried out in the former U.S.S.R. at the end of the nineteenth century, rearing technology has advanced considerably during the last 20 years and noticeable improvements in incubation and larval rearing techniques have been implemented in normal hatchery procedures. Siberian sturgeon eggs are incubated in MacDonald jars at 13-14 C to prevent fungal infections. Mass hatching takes place 7 days after fertilization and hatching rate can be predicted as a function of the percentage of eggs fertilized. Survival at the end of the endogenous feeding stage is correlated with hatching rate. Egg size has no direct implications for larval growth and survival of Siberian sturgeon. Experimental studies have demonstrated that behavioural observations are useful criteria to assess the quality of larvae and to synchronize the physiological state of fish with the appropriate rearing procedures. Special attention should be given to the transition to exogenous feeding, where cannibalism, difficulties in adaptation to a new diet, overfeeding and resulting bacterial infections dramatically reduces survival to the fingerling stage. Although a commercial artificial diet specifically formulated for larvae of Siberian sturgeon and other acipenserids is still lacking, commercial non-purified rainbow trout diets and starter marine fish diets are currently used and their results are reasonably acceptable in terms of larval growth and survival. Further research must be focused on the determination of egg quality indicators in order to provide the producer with the tools to estimate the viability and performance of the progeny.

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Duration of synchronous egg cleavage cycles at different temperatures in Siberian sturgeon (Acipenser baerii)

Cited by 12 publications

References 7 publications

How Different Stocking Densities Affect Growth and Stress Status of Acipenser baerii Early Stage Larvae

How Different Stocking Densities Affect Growth and Stress Status of Acipenser baerii Early Stage Larvae

Effects of different rearing temperatures on muscle development and stress response in the early larval stages of Acipenser baerii

Advances in the larval rearing of Siberian sturgeon

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