Quality of hatchery-reared juveniles for marine fisheries stock enhancement

Vay, Lewis Le; Carvalho, Gary R.; Quinitio, Emilia T.; Lebata, Junemie H.; Út, Vũ Ngọc; Fushimi, Hiroshi

doi:10.1016/j.aquaculture.2007.04.041

Cited by 85 publications

(40 citation statements)

References 104 publications

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“…However, no farm today can claim a routine production of 100% non-deformed fish, also because the early assessment of severe anomalies is often difficult as they begin as slight aberrations of the internal elements that only later can develop into more severe abnormalities affecting the external body shape. The presence of severely deformed reared fish can cause consumers to lose confidence in aquaculture products [15] and reduce the commercial value of the reared lots [10]–[11], [13]–[14], [16]–[24]. Even automatic fillet processing is impaired by the presence of vertebral deformities, thus reducing economic return [25].…”

Section: Introductionmentioning

confidence: 99%

“…the capacity to buffer variations in the external (environmental) and internal (genetic stress) conditions (through canalisation and developmental stability), thus allowing the expression of deviated ontogenetic and growth processes, such as anatomical anomalies, fluctuating asymmetry, altered meristic counts and anomalous pigmentation [27]. Accordingly, all these anomalies may be considered as developmental disturbances, indicative of the presence of inappropriate rearing conditions [11], [14], [20], [28]–[34] or genetic impairment. According to the available literature, each environmental (biotic and abiotic) factor/parameter (oxygen, temperature, pH, stocking density, water flow, CO 2 , rearing volumes, inappropriate alimentation, heavy metals, bacteria, parasites, toxicants …), if at a non-optimal level for the reared species or life stage, can cause skeletal anomalies in reared fishes [13]–[14], [16]–[17], [35]–[38].…”

Section: Introductionmentioning

confidence: 99%

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Environmental Conditioning of Skeletal Anomalies Typology and Frequency in Gilthead Seabream (Sparus aurata L., 1758) Juveniles

et al. 2013

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In this paper, 981 reared juveniles of gilthead seabream (Sparus aurata) were analysed, 721 of which were from a commercial hatchery located in Northern Italy (Venice, Italy) and 260 from the Hellenic Center for Marine Research (Crete, Greece). These individuals were from 4 different egg batches, for a total of 10 different lots. Each egg batch was split into two lots after hatching, and reared with two different methodologies: intensive and semi-intensive. All fish were subjected to processing for skeletal anomaly and meristic count analysis. The aims involved: (1) quantitatively and qualitatively analyzing whether differences in skeletal elements arise between siblings and, if so, what they are; (2) investigating if any skeletal bone tissue/ossification is specifically affected by changing environmental rearing conditions; and (3) contributing to the identification of the best practices for gilthead seabream larval rearing in order to lower the deformity rates, without selections. The results obtained in this study highlighted that: i) in all the semi-intensive lots, the bones having intramembranous ossification showed a consistently lower incidence of anomalies; ii) the same clear pattern was not observed in the skeletal elements whose ossification process requires a cartilaginous precursor. It is thus possible to ameliorate the morphological quality (by reducing the incidence of severe skeletal anomalies and the variability in meristic counts of dermal bones) of reared seabream juveniles by lowering the stocking densities (maximum 16 larvae/L) and increasing the volume of the hatchery rearing tanks (minimum 40 m3). Feeding larvae with a wide variety of live (wild) preys seems further to improve juvenile skeletal quality. Additionally, analysis of the morphological quality of juveniles reared under two different semi-intensive conditions, Mesocosm and Large Volumes, highlighted a somewhat greater capacity of Large Volumes to significantly augment the gap with siblings reared in intensive (conventional) modality.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Environmental Conditioning of Skeletal Anomalies Typology and Frequency in Gilthead Seabream (Sparus aurata L., 1758) Juveniles

et al. 2013

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“…Skeletal deformities have long been identified as a major constraint for the production of high quality juveniles for aquaculture, but also for stock enhancement programs (Hickey, 1972; Le Vay et al., 2007). In larviculture, skeletal deformities are undesirable in terms of fish welfare, reducing fitness and market value.…”

Section: Introductionmentioning

confidence: 99%

Osteology of the axial and appendicular skeletons of the meagre Argyrosomus regius (Sciaenidae) and early skeletal development at two rearing facilities

Cardeira

Vallés

Dionísio

et al. 2012

Journal of Applied Ichthyology

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Summary The meagre (Argyrosomus regius) is a new species for aquaculture diversification, presenting a high economic value and a high growth rate, reaching 1 kg year−1. The occurrence of deformities, which generally appear in cultured larvae at early stages, is problematic for aquaculture since they reduce fish fitness and profitability. Knowledge about the stages of skeletal formation is essential to accurately assess deformities in hatchery produced fish. Here, we describe the osteology of the axial skeleton and unpaired fins of the meagre. Based on this data, the osteological development of meagre larvae reared at the IPIMAR and IRTA‐SCR, under different rearing conditions, was compared. Although little literature is available on the osteology of teleosts from the same taxonomic group, the skeletal composition of the meagre is comparable to that of other Sciaenidae. All skeletal structures considered appeared at earlier stages in larvae reared at IPIMAR, which presented a more advanced skeletal development in comparison to larvae of comparable length reared at IRTA‐SCR that were submitted to lower temperature and light intensity, and reduced photoperiod regimes.

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“…Careful decisions need to be made about whether these interventions are likely to be costeffective in improving productivity. Many previous attempts to develop marine ranching and stock enhancement have been hampered by factors such as lack of capability to evaluate success of hatchery releases and the relative lack of fitness of reared organisms released in the wild (see review by Le Vay et al 2007). These problems have been addressed by recent advances in tagging technology, improved success in hatchery production for different species and conditioning strategies employed before releasing hatchery-reared organisms in the wild.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of hatchery-based enhancement of the mud crab, Scylla spp., fisheries in mangroves: comparison of species and release strategies

Lebata

Vay

Walton

et al. 2009

Mar. Freshwater Res.

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Ranching, stock enhancement and restocking are management approaches involving the release of wild or hatchery-bred organisms to enhance, conserve or restore fisheries. The present study, conducted from April 2002 to November 2005, evaluated the effectiveness of releasing wild and hatchery-reared (HR) mud crabs in the mangroves of Ibajay, Aklan, Philippines where preliminary studies demonstrated declining fishery yields, abundance and size of crabs. Comparison of survival and growth of wild-released and HR Scylla olivacea and HR Scylla serrata demonstrated the effect of nursery conditioning, size-at-release and species differences. Overall yield and catch per unit effort (CPUE) increased by 46% after stock enhancement trials. Recapture rates of released crabs were highest in wild-released S. olivacea and in crabs measuring 65.0-69.9 mm carapace width (CW) and lowest in non-conditioned HR S. serrata. Growth rates were highest for conditioned HR S. olivacea and lowest for conditioned HR S. serrata (11.7 and 3.7 mm month −1 respectively). Fishing mortality was highest for S. olivacea, whereas natural mortality was greater for S. serrata. Conditioning hatcherybred animals before release is also important in obtaining higher survival. S. olivacea was the more appropriate of the two species for release in mangrove habitats inundated with low-salinity water. However, there is a need for site-specific studies to evaluate the effectiveness of releases.

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Quality of hatchery-reared juveniles for marine fisheries stock enhancement

Cited by 85 publications

References 104 publications

Environmental Conditioning of Skeletal Anomalies Typology and Frequency in Gilthead Seabream (Sparus aurata L., 1758) Juveniles

Environmental Conditioning of Skeletal Anomalies Typology and Frequency in Gilthead Seabream (Sparus aurata L., 1758) Juveniles

Osteology of the axial and appendicular skeletons of the meagre Argyrosomus regius (Sciaenidae) and early skeletal development at two rearing facilities

Evaluation of hatchery-based enhancement of the mud crab, Scylla spp., fisheries in mangroves: comparison of species and release strategies

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