Restocking and stock enhancement of coastal fisheries: Potential, problems and progress

Bell, Johann D.; Bartley, D. M.; Lorenzen, Kai; Loneragan, N.R.

doi:10.1016/j.fishres.2006.03.008

Cited by 153 publications

(122 citation statements)

References 31 publications

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“…Stock enhancement seeks to aid the recovery of depleted fish populations through the release of cultured (hatchery) fish into the wild (Bell et al 2006). However, the results of stock enhancement releases have been mixed (Molony et al 2003), largely due to several problematic issues (Brown and Day 2002;Salvanes and Braithwaite 2006).…”

Section: Introductionmentioning

confidence: 99%

Stability of behavioral syndromes but plasticity in individual behavior: consequences for rockfish stock enhancement

Lee

Bereijikian

2007

Environ Biol Fish

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This study investigated behavioral syndromes, which are defined as correlations between behaviors. Behavioral syndromes can lead to the unintentional alteration of a wide range of behavioral traits of hatchery fish if unintentional selection on one behavior leads to selection on a correlated behavior. Specifically, this study used brown rockfish, Sebastes auriculatus, to test the hypothesis that a fish that feeds at high rates in the absence of a predator also takes more risks when a predator is present, and that through such a correlation, unintentional hatchery selection for high feeding rates may also lead to changes in risk taking behavior (here defined as behavior that increases predation risk). Behavioral syndromes were found-feeding behavior in the absence of a predator tended to correlate positively with both feeding behavior in the presence of a predator model and time near the model. These syndromes were stable through time-that is, the same correlations appeared 10 days later when the behavioral assays were repeated. However individual behavior was inconsistent (plastic). A fish could both feed and take risks at high rates on Day 1, but then both feed and take risks at low rates on Day 10. Thus, while behavioral syndromes were stable (i.e. present in both rounds 1 and 2), individuals were plastic in their behavior (i.e. inconsistent between rounds 1 and 2). After 16 weeks of hatchery rearing, neither growth nor survival were predicted by behavior. It is suggested that the behavioral plasticity within individuals through time makes consistent selection for strong feeders less likely, and that species with more plastic behavior may be less susceptible to unintentional selection on behavioral syndromes than species with behavior that is more fixed.

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Section: Introductionmentioning

confidence: 99%

Stability of behavioral syndromes but plasticity in individual behavior: consequences for rockfish stock enhancement

Lee

Bereijikian

2007

Environ Biol Fish

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“…Reared individuals must be efficiently and unambiguously differentiated from wild stocks Leber 1995, Chick 2010). Therefore, the development and testing of a reliable tagging method should precede any investment in restocking itself (Bell et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Comparing tagging strategies: Effects of tags on retention rate, mortality rate and growth in hatchery-reared juvenile meagre, <em>Argyrosomus regius</em> (Pisces: Sciaenidae)

Gil

Palmer²,

Grau

et al. 2017

Sci. Mar.

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Summary:The objective of this study was to compare the effectiveness of different tags (T-bar anchor tags, internal anchor tags and visible implant elastomers) implanted into juvenile meagre, Argyrosomus regius (Asso, 1801) for a restocking programme conducted in the Balearic Islands. Effectiveness was assessed in terms of tag loss, fish survival and fish growth by means of a tank experiment. The internal anchor tags showed the highest retention rate (100%), but the tagging mortality was also high (40%). The tagging mortality of T-bar tags was negligible. However, another tank experiment with different food rates showed the tag retention rate of the T-bar tag to be highly variable, ranging from 35% to 95%. In contrast with other reported results, the retention rate of visible implant elastomers was low (48%). Finally, none of the tested tags affected growth. In summary, the T-bar anchor tags showed the best trade-off between short-term tag retention and fish mortality, and seem to be the most suitable tagging method for meagre juveniles.Keywords: anchor tags; Argyrosomus regius; growth; meagre; tag retention; tagging mortality; visible implant elastomer.Comparación de diferentes estrategias de marcaje: Efectos en la tasa de retención, tasa de mortalidad y crecimiento de marcas alojadas en juveniles de corvina Argyrosomus regius (Pisces: Sciaenidae) criados en cautividad Resumen: El objetivo de este estudio fue comparar la efectividad de diferentes marcas (marca con anclaje en T, marca con anclaje abdominal y marcaje con elastómero visible, VIE) implantadas en corvinas juveniles (Argyrosomus regius Asso, 1801) para un programa de repoblación llevado a cabo en las Islas Baleares. La efectividad fue evaluada en función de la pérdida de marcas, la supervivencia y el crecimiento de los peces mediante un experimento en tanque. Las marcas con anclaje abdominal presentaron la tasa de retención más alta (100%), pero también presentaron la mayor tasa de mortalidad (40%). La tasa de mortalidad de las marcas con anclaje en T fue despreciable. Sin embargo, otro experimento con diferentes tasas de alimentación mostró que la tasa de retención de las marcas T fue muy variable, oscilando entre un 35% y un 95%. En contraste con otros resultados publicados, la tasa de retención de los VIE fue baja (48%). Finalmente, ninguna de las marcas testadas afectó al crecimiento. En resumen, las marcas con anclaje en T mostraron el mejor compromiso entre la tasa de retención a corto plazo y la tasa de mortalidad de los peces, y parece ser el método de marcaje más adecuado para los juveniles de corvina.Palabras clave: marcas de anclaje; Argyrosomus regius; crecimiento; corvina; tasa de retención; mortalidad por marcaje; elastómero visible. Citation/Como citar este artículo: Gil M.M., Palmer M., Grau A., Massutí E., Pastor E. 2017. Comparing tagging strategies: Effects of tags on retention rate, mortality rate and growth in hatchery-reared juvenile meagre, Argyrosomus regius (Pisces: Sciaenidae). Sci. Mar. 81(2): 171-178. doi: http://dx

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“…The Portuguese Fisheries and Marine Research Laboratory (IPIMAR) produces and rears these 2 species in its own Aquaculture Research Station (EPPO). The capacity to mass produce fish species is one of the conditions to consider a species for restocking (Bell et al 2006;Støttrup and Sparrevohn, 2007). Although presently both stocks do not require such intervention, IPIMAR has been testing the potential of these species for restocking, since according to Bell et al (2006), there are no "shortcuts" to identify whether hatchery releases will be a viable management option for each situation.…”

Section: Introductionmentioning

confidence: 99%

“…The capacity to mass produce fish species is one of the conditions to consider a species for restocking (Bell et al 2006;Støttrup and Sparrevohn, 2007). Although presently both stocks do not require such intervention, IPIMAR has been testing the potential of these species for restocking, since according to Bell et al (2006), there are no "shortcuts" to identify whether hatchery releases will be a viable management option for each situation. The establishment of a founder stock for sparid hatchery production should be considered the fundamental step in broodstock management, since it will determine the population's genetic variability and inbreeding that will take place by future crosses.…”

Section: Introductionmentioning

confidence: 99%

Genetic differences between wild and hatchery populations ofDiplodus sargus andD. vulgaris inferred from RAPD markers: implications for production and restocking programs design

et al. 2010

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Abstract.Restocking and stock enhancement programs are now recognized as an important tool for the management of fishery resources. It is important, however, to have an adequate knowledge on the genetic population structure of both the released stock and the wild population before carrying out such programs. In this study, random amplified polymorphic DNA (RAPD) markers were applied to assess genetic diversity and population structure of wild and hatchery populations of the white seabream Diplodus sargus and the common two-banded seabream D. vulgaris (Sparidae). The estimated values for intrapopulation genetic variation, measured using the percentage of polymorphic loci (%P), Shannon index (H'), and Nei's gene diversity (h), showed high values for all populations. The percentage of genetic variation within D. sargus and D. vulgaris populations, based on coefficient of gene differentiation, reached 82.5% and 90% of the total genetic variation, respectively. An undeniable decrease in genetic variation was found in both hatchery populations, particularly in D. sargus, compared to the wild ones. However, the high values of variation within all populations and the low levels of genetic variation among populations did not indicate inbreeding or depression effects, thus indicating a fairly proper hatchery management. Nevertheless, the results of this study highlight the importance of monitoring the genetic variation of hatchery populations, particularly those to be used in restocking programs. The creation of a genetic baseline database will contribute to a more efficient conservation management and to the design of genetically sustainable restocking programs.

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Restocking and stock enhancement of coastal fisheries: Potential, problems and progress

Cited by 153 publications

References 31 publications

Stability of behavioral syndromes but plasticity in individual behavior: consequences for rockfish stock enhancement

Stability of behavioral syndromes but plasticity in individual behavior: consequences for rockfish stock enhancement

Comparing tagging strategies: Effects of tags on retention rate, mortality rate and growth in hatchery-reared juvenile meagre, <em>Argyrosomus regius</em> (Pisces: Sciaenidae)

Genetic differences between wild and hatchery populations ofDiplodus sargus andD. vulgaris inferred from RAPD markers: implications for production and restocking programs design

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