Modeling bottom-up and top-down controls on the low recruitment success of oyster larvae in Hiroshima Bay, Japan

Wahyudin,; Yamamoto, Tamiji

doi:10.1016/j.aquaculture.2020.735564

Cited by 9 publications

(6 citation statements)

References 57 publications

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“…Using a numerical model, Wahyudin and Yamamoto (2020) showed that the recent low success rates in the settlement of oyster larvae in Hiroshima Bay appeared to be driven by insufficient quantities of the phytoplankton because of the low nutrient load. Future research is needed in this regard.…”

Section: Discussionmentioning

confidence: 99%

“…Biological factors such as phytoplankton blooms may trigger spawning because they lead to favorable conditions for larval growth and survival (Starr et al, 1990). Using a numerical model, Wahyudin and Yamamoto (2020) showed that the recent low success rates in the settlement of oyster larvae in Hiroshima Bay appeared to be driven by insufficient quantities of the phytoplankton because of the low nutrient load. Future research is needed in this regard.…”

Section: Discussionmentioning

confidence: 99%

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Larval occurrence and environmental factors associated with spawning of Pacific oyster Crassostrea gigas in Matsushima Bay, Japan

Yokouchi

Ito

Togawa³

et al. 2022

Fisheries Oceanography

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The spawning of Pacific oysters is an important phenomenon for aquaculture because the Japanese oyster culture industry has traditionally utilized natural seed collection from sea areas. The relationship between spawning and environmental factors was investigated on the spawning dates, which were estimated from larval occurrence based on the temperature-dependent growth rate from 2012 to 2020 in Matsushima Bay, a key area for oyster seedling production located in eastern Japan.The annual minimum temperature tended to increase and occur earlier during the 9 years, suggesting warming in the bay. The integrated temperature reaching 600 C, which is as an index for the onset of spawning, was limited to 9 days from late June to early July, and exhibited no trends. Larval abundance at each spawning had a significant relationship with the change of sunshine hours from the previous day, the daily mean seawater temperature, and the maximum tidal range. With relatively extreme environmental factors, mass spawning between neap and half tides was more frequent than one during other tides. A significant relationship was found between precipitation during the rainy season and the mass spawning dates. An empirical method of predicting a mass spawning date was proposed using the relationship to precipitation during the rainy season to ensure efficient seedlings and a constant nationwide supply of Pacific oysters for the aquaculture industry.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Larval occurrence and environmental factors associated with spawning of Pacific oyster Crassostrea gigas in Matsushima Bay, Japan

Yokouchi

Ito

Togawa³

et al. 2022

Fisheries Oceanography

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“…We estimated that the total fish biomass swimming in and around the oyster rafts was 333 g FW m -3 in Hiroshima Bay. [17] Reported that fish biomass increasing during their observation using the numerical model in Hiroshima Bay. Using an underwater visual census (UVC), [18] estimated the fish biomass on the natural oyster reefs in Western Australia to be 7.8 kg km -2 .…”

Section: Discussionmentioning

confidence: 99%

An Estimation of Fish Biomass and Attached Organisms beneath Oyster Rafts in Hiroshima Bay, Japan

Wahyudin

Yamamoto

2021

E3S Web Conf.

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Hiroshima Bays is top production approximately 60% of oyster production in Japan. For cultivate of oyster, fishermen use hanging rafts. A thousand of raft is hanging during 2-3 years in the bay. Large-scale oyster culture may change the ecosystem structure and material cycles in the bay through the filtration of particulate matter by oysters and other associated animals. This study described the community structure of marine organisme in terms of fishes surrounding and animal attached on oyster rafts. Field observation was carried out from 2016 to 2019 at oyster farming in Hiroshima Bay. Oyster production and provisioning for the fish habitat were also evaluated by placing underwater video cameras beneath oyster culture rafts. The result showed that black seabream was high biomass and oyster it shelf was bigger bioyster for animal attached on oyster raft. The number of individual, mussel is most abundance of animal attach on oyster raft with ratio 9:1 than number of oyster. Maintaining oyster culture is important not only for maintaining oyster production, but also for maintaining fish production by enhancing material cycles through the paths in the food chains of Hiroshima Bay under oligotrophic conditions.

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“…Our group has previously established a model that can reproduce the bottom hypoxia and remediation effects of byproducts by applying them to the sediments [91]. The other models we have been developed can be used to measure the oligotrophication of the surface water and oyster production [43,66]. We must discuss the simulation outputs in detail as a future prospect with different stakeholders.…”

Section: Yearmentioning

confidence: 99%

“…In Hiroshima Bay, which is in the western part of the Seto Inland Sea, oyster culture has been conducted intensively for more than 60 years, accounting for 60% of the total production in Japan [42]. However, the oyster production in the bay is in a crisis due to the lack of feed phytoplankton, and recently, it has been observed that the oyster larvae cannot survive due to the lack of small-sized phytoplankton (<5 µm in diameter) suitable for their feed [43]. In contrast, oysters, through their feeding activity, stimulate biogeochemical processes in the sediments by increasing the sedimentation of organic matter from the water column [44,45].…”

Section: Introductionmentioning

confidence: 99%

A Conflict between the Legacy of Eutrophication and Cultural Oligotrophication in Hiroshima Bay

Yamamoto

Orimoto

Asaoka

et al. 2021

Oceans

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Although the water quality in Hiroshima Bay has improved due to government measures, nutrient reduction has sharply decreased fisheries production. The law was revised in 2015, where the nutrient effluents from the sewage treatment plants were relaxed, yet no increase in fishery production was observed. Herein, we investigate the distribution of C, N, S, and P within Hiroshima Bay. Material loads from land and oyster farming activity influenced the C and S distributions in the bay sediments, respectively. Natural denitrification caused N reduction in areas by the river mouths and the landlocked areas whose sediments are reductive. The P content was high in the areas under aerobic conditions, suggesting metal oxide-bound P contributes to P accumulation. However, it was low in the areas with reducing conditions, indicating P is released from the sediments when reacting with H2S. In such reductive sediments, liberated H2S also consumes dissolved oxygen causing hypoxia in the bottom layer. It was estimated that 0.28 km3 of muddy sediment and 1.8 × 105 ton of P accumulated in Hiroshima Bay. There remains conflict between the ‘Legacy of Eutrophication’ in the sediment and ‘Cultural Oligotrophication’ in the surface water due to 40 years of reduction policies.

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Modeling bottom-up and top-down controls on the low recruitment success of oyster larvae in Hiroshima Bay, Japan

Cited by 9 publications

References 57 publications

Larval occurrence and environmental factors associated with spawning of Pacific oyster Crassostrea gigas in Matsushima Bay, Japan

Larval occurrence and environmental factors associated with spawning of Pacific oyster Crassostrea gigas in Matsushima Bay, Japan

An Estimation of Fish Biomass and Attached Organisms beneath Oyster Rafts in Hiroshima Bay, Japan

A Conflict between the Legacy of Eutrophication and Cultural Oligotrophication in Hiroshima Bay

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