Distribution and abundance of cultured scallop Patinopecten yessoensis in extensive sea beds as assessed by underwater camera

Goshima, Seiji; Fujiwara, Hiroshi

doi:10.3354/meps110151

Cited by 28 publications

(13 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Removing predators ap-pears to be a requirement for successful seeding in other parts of the world (Ventilla 1982, Goshima andFujiwara 1994). Perturbation analysis of the model showed that adequate scallop survival could only be attained at low crab density.…”

Section: Biological Implications Of the Model Analysismentioning

confidence: 99%

See 1 more Smart Citation

A Matrix Model for Short-Term Dynamics of Seeded Populations of Sea Scallops

Barbeau

Caswell

1999

Ecological Applications

View full text Add to dashboard Cite

Recently, there has been increasing interest in releasing (''seeding'') bivalves onto the seabed for purposes of aquaculture or population enhancement. The success of such enterprises has varied greatly and is related to the interactions between mortality, dispersal, and growth of the organisms. In this paper, we have constructed a stage-based matrix model for short-term population dynamics of seeded sea scallops (Placopecten magellanicus). Our goals were to predict scallop survival to commercial size and to determine the relative contributions of predation, dispersal, and growth to loss of scallops. Competing risk theory was used to account for predation by crabs and by sea stars, and for correlations between dispersal and predation (both of which depend on encounters with predators). Density dependence (in the form of predator functional responses), seasonal variation, and a simple spatial structure were also incorporated into the model. The model was parameterized from the results of small-scale experiments and tested against independently observed population trajectories. Uncertainty analysis was used to determine the effect of parameter sampling error on model output. Sensitivity analysis indicated that variables affecting predation by crabs were important and that variables affecting intermediate-sized scallops (e.g., large juveniles) were more important than those affecting other size classes. Using perturbation analysis, we ranked alternative management scenarios for increasing final scallop survival from the most effective to the least effective as follows: reducing predator densities, increasing size of seeded scallops, changing the initial density of seeded scallops, increasing the dimensions of the site, and changing the season of seeding. Inclusion of seasonal variability in predator densities (thereby converting the deterministic model into a stochastic model) did not greatly change final scallop survival.

show abstract

Section: Biological Implications Of the Model Analysismentioning

confidence: 99%

“…Taken together, the results of the model analysis indicate that predator control strategies (e.g., Spencer 1992) need to be considered, especially for crabs. Removing predators ap-pears to be a requirement for successful seeding in other parts of the world (Ventilla 1982, Goshima andFujiwara 1994).…”

Section: Biological Implications Of the Model Analysismentioning

confidence: 99%

A Matrix Model for Short-Term Dynamics of Seeded Populations of Sea Scallops

Barbeau

Caswell

1999

Ecological Applications

View full text Add to dashboard Cite

show abstract

“…Fishers pay most of the programme costs (Uki, 2006). The cooperatives use the following management system for the Japanese scallop fishery: (1) mass-releases of wild-born spat (wild-born larvae collected in the sea are reared in net cages for one year, until release); (2) removal of predators, such as starfish, before release; (3) monitoring of the density of scallops in the fishing ground; and (4) rotation of the fishing grounds chosen for harvesting (Goshima & Fujiwara, 1994; Kitada & Fujishima; Nishihama, 2001; Uki, 2006). The fishing grounds are generally partitioned into four areas, and 1-year-old wild-born spat (∼4.5 cm) that were reared in net cages are released into a given area after removing starfish, and the released scallops are harvested after three years, when they reach 4 years old.…”

Section: Consequences Of the World’s Largest Programmesmentioning

confidence: 99%

Lessons from Japan marine stock enhancement and sea ranching programmes over 100 years

Kitada

2019

Preprint

View full text Add to dashboard Cite

More than 26 billion juveniles of 180 marine species are released annually into the wild in over 20 countries, but the usefulness of this strategy remains unclear. Here, I analyse the effects of stocking by Japanese marine and salmon stock-enhancement programmes and evaluate their efficacy through a Bayesian meta-analysis of new and previously considered cases. The posterior mean recapture rate (± SD) was 8.3 ± 4.7%. Without considering personnel costs and negative impacts on wild populations, the mean economic efficiency was 2.8 ± 6.1, with many cases having values of 1 to 2. On the macro-scale, the proportion of released seeds to total catch was 76 ± 20% for Japanese scallop, 28 ± 10% for abalone, 20 ± 5% for swimming crab, 13 ± 5% for kuruma prawn, 11 ± 4% for Japanese flounder, and 7 ± 2% for red sea bream; according to these percentages, stocking effects were generally small, and population dynamics were unaffected by releases but dependent on the carrying capacity of the nursery habitat. All cases of Japanese releases, except for Japanese scallop, were probably economically unprofitable. Captive breeding reduces the fitness of hatchery fish in the wild. In addition, long-term releases replace wild genes and may cause fitness decline in the recipient population when the proportion of hatchery fish is very high. Short-term hatchery stocking can be useful, particularly for conservation purposes, but large-scale programmes may harm the sustainability of populations. Nursery habitat recovery and fishing pressure reduction often outperform hatcheries in the long run.

show abstract

“…In this mariculture system, young scallops (ca. 1‐year‐old; >30 mm) are released on the sea floor, and, after 3 or 4 years, scallops (grown to commercial size; >100 mm) are harvested by dredge nets (Goshima & Fujiwara, ; Hayashi, Tomita, Wakui, Ito, & Matsuya, ; Kosaka, ). Consequently, cultured scallops grow in native ecological systems where they encounter a variety of natural predators.…”

Section: Introductionmentioning

confidence: 99%

Interactions between predatory sea stars ( Asterias amurensis and Distolasterias nipon ) and Japanese scallops ( Mizuhopecten yessoensis ) and implications for scallop seeding in mariculture

2019

View full text Add to dashboard Cite

Sea stars are a key group of species in benthic marine ecosystems and represent the primary cause of mortality for cultured scallops. In the mariculture grounds of Japanese scallops (Mizuhopecten yessoensis) in north‐eastern Japan, two sea star species, Asterias amurensis (AA) and Distolasterias nipon (DN), are serious predators. However, the predatory impact of these sea stars on scallops remains unquantified, with limited information being available on the biological characteristics of DN. We compared the predatory impact of both sea star species by evaluating their predatory behaviour (i.e. probability of predation and number of captured scallops) on scallops in laboratory experiments. Both sea star species preferred smaller scallops over large ones, with the probability of predation and the number of scallops being preyed on increasing with increasing water temperature. However, DN had a greater predation impact than AA. For instance, the probability of predation by DN was higher, with more scallops being consumed. In particular, compared to AA, DN continuously captured small scallops and fed on larger scallops. Furthermore, the predatory impact of both sea star species (particularly DN) on small scallops peaked at high temperatures. In conclusion, our results present information that could help improve the survival rate of seeded scallops in mariculture systems.

show abstract

Distribution and abundance of cultured scallop Patinopecten yessoensis in extensive sea beds as assessed by underwater camera

Cited by 28 publications

References 17 publications

A Matrix Model for Short-Term Dynamics of Seeded Populations of Sea Scallops

A Matrix Model for Short-Term Dynamics of Seeded Populations of Sea Scallops

Lessons from Japan marine stock enhancement and sea ranching programmes over 100 years

Interactions between predatory sea stars ( Asterias amurensis and Distolasterias nipon ) and Japanese scallops ( Mizuhopecten yessoensis ) and implications for scallop seeding in mariculture

Contact Info

Product

Resources

About