Feeding hatchery-reared dusky grouper Epinephelus marginatus juveniles on live prey: implications for restocking

Donadelli, V.; Longobardi, Alessandro; Finoia, María Grazia; Marino, G.

doi:10.1007/s10641-015-0395-3

“…Thus, much of this variation in captive fish behaviour may also be due to differences in personality. Moreover, research is increasingly directed towards behavioural conditioning of hatchery-reared fish as a mean of diminishing mortality rates post release ( Kellison, Eggleston & Burke, 2000 ; Fairchild & Howell, 2004 ; Donadelli et al, 2015 ; Sloychuk, Chivers & Ferrari, 2016 ). Much of this conditioning involves learned responses to predators and prey ( Brown & Laland, 2011 ; Brown & Day, 2002 ).…”

Section: Introductionmentioning

confidence: 99%

Stress profile influences learning approach in a marine fish

Raoult

¹

,

Trompf

²

,

Williamson

³

et al. 2017

PeerJ

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The spatial learning skills of high and low stress juvenile mulloway (Argyrosomus japonicus) were tested in a dichotomous choice apparatus. Groups of fish were formed based on background blood cortisol levels and required to learn the location of a food reward hidden in one of two compartments. Low stress fish characterised by low background levels of the stress hormone cortisol had higher activity levels and entered both rewarded and unrewarded rooms frequently. Within the first week of exposure, however, their preference for the rewarded room increased, indicative of learning. Fish that had high background levels of cortisol, in contrast, showed low levels of activity but when they chose between the two rooms they chose the rewarded room most often but showed less improvement over time. After 12 days in the apparatus, both low and high stress fish had similar ratios of rewarded vs unrewarded room entrances. Our results suggest that proactive coping styles may increase exposure to novel contexts and thus favour faster learning but at the cost of reduced initial accuracy.

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“…Aquaculture is often limited to food production purposes, however, some aquaculture can present a positive opportunity for MPAs such as restocking of vulnerable species and enhancement of biodiversity. Aquaculture of the dusky grouper ( Epinephelus marginatus ) for conservation purposes undertaken in Italian MPAs is one example (Donadelli, Longobardi, Finoia, & Marino, ). The objective of the programme was to restore the population of groupers after years of overfishing and evaluate the success of restocking related to the survival rate of juveniles in the wild (the original population was reduced by 88% between 1990 and 2000).…”

Section: Identifying Synergies Between Mpas and Aquaculturementioning

confidence: 99%

Aquaculture and marine protected areas: Potential opportunities and synergies

Gouvello

¹

,

Hochart

²

,

Laffoley

³

et al. 2017

Aquatic Conservation

Self Cite

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To meet the Convention on Biological Diversity0 s Aichi Target 11 on marine biodiversity protection and Aichi Target 6 on sustainable fisheries by 2020, as well as the Sustainable Development Goal (SDG) 2 on food security and SDG 14 on oceans by 2030, there is an urgent need to rethink how best to reconcile nature conservation and sustainable development. 4. It is recognized that aquaculture is an important activity in terms of sustainable development. It can play a role in providing food security, poverty alleviation and economic resilience, in particular for MPA local communities, and contribute to wild stock enhancement, as an alternative to overfishing and for providing services to the ecosystem.5. This study showed that there is a need from both aquaculture and MPA sides for clarity of objectives and willingness for open and extensive dialogue. The paper concludes by describing a number of tools and methods for supporting greater synergies between aquaculture and MPAs.6. The results from this work have already helped to build a common understanding between conservation and aquaculture and initiate a rapprochement for increasing synergies.KEYWORDS aquaculture, ecosystem approach, environmental impact assessment, littoral, marine protected area, ocean, sublittoral

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“…Thus, much of this variation in captive fish behaviour may also be due to differences in personality. Moreover, research is increasingly directed towards behavioural conditioning of hatchery-reared fish as a mean of diminishing mortality rates post release (Kellison et al, 2000, Fairchild and Howell, 2004, Donadelli et al, 2015, Sloychuk et al, 2016.…”

Section: Introductionmentioning

confidence: 99%

Peer Review #2 of "Stress profile influences learning approach in a marine fish (v0.1)"

Ruiz¹

2017

0

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The spatial learning skills of high and low stress juvenile mulloway (Argyrosomus japonicus) were tested in a dichotomous choice apparatus. Groups of fish were formed based on background blood cortisol levels and required to learn the location of a food reward hidden in one of two compartments. Low stress fish characterised by low background levels of the stress hormone cortisol had higher activity levels and entered both rewarded and unrewarded rooms frequently. Within the first week of exposure, however, their preference for the rewarded room increased, indicative of learning. Fish that had high background levels of cortisol, in contrast, showed low levels of activity but when they chose between the two rooms they chose the rewarded room most often but showed less improvement over time. After 12 days in the apparatus, both low and high stress fish had similar ratios of rewarded vs unrewarded room entrances. Our results suggest that proactive coping styles may increase exposure to novel contexts and thus favour faster learning but at the cost of reduced initial accuracy.

show abstract

Feeding hatchery-reared dusky grouper Epinephelus marginatus juveniles on live prey: implications for restocking

Cited by 10 publications

References 37 publications

Stress profile influences learning approach in a marine fish

Stress profile influences learning approach in a marine fish

Aquaculture and marine protected areas: Potential opportunities and synergies

Peer Review #2 of "Stress profile influences learning approach in a marine fish (v0.1)"

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