Economic feasibility of producing oysters using a small-scale Hawaiian fishpond model

Chen, Jessie Q.; Haws, María; Fong, Quentin; Leung, PingSun

doi:10.1016/j.aqrep.2016.12.001

Cited by 23 publications

(17 citation statements)

References 4 publications

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“…Native Hawaiians practiced aquaculture for centuries prior to the arrival of Europeans, however, the local fishpond productivity was reduced 100-fold by the mid 1970s (Chen et al 2017a). In recent years, the industry has begun to expand once more, and to diversify by producing oysters for environmental purposes as well as for food.…”

Section: Discussionmentioning

confidence: 99%

Genetic analysis identifies theOstrea stentina/aupouria/equestrisoyster species complex in Hawai‘i, and resolves its lineage as the western PacificO. equestris

Sutton

Nishimoto

Schrader

et al. 2020

Preprint

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BackgroundExtensive phenotypic plasticity in oysters makes them difficult to identify based on morphology alone, but their identities can be resolved by applying genetic and genomic technologies. In this study, we collected unknown oyster specimens from Hawaiian waters for genetic identification.MethodsWe sequenced two partial gene fragments, mitochondrial 16S ribosomal RNA (16S) and cytochrome c oxidase subunit I (COI), in 48 samples: 27 unidentified oyster specimens collected from two locations on O‘ahu, 13 known specimens from a hatchery in Hilo, Hawai‘i Island, and 8 known specimens from Hilo Bay, Hawai‘i Island.ResultsMolecular data identified approximately 85% of unknown samples as belonging to the Ostrea stentina/aupouria/equestris species complex, a globally distributed group with a history of uncertain and controversial taxonomic status. The remaining unknown samples were the native Dendostrea sandvichensis (G. B. Sowerby II, 1871), and nonnative Crassostrea gigas (Thunberg, 1793), the latter of which is a commercial species that was introduced to Hawai‘I from multiple sources during the 20th century. Phylogenetic analysis placed Hawai‘i Ostrea alongside samples from China, Japan, and New Zealand, grouping them within the recently classified western Pacific O. equestris. Until now, four extant species of true oyster have been documented in Hawai‘i. This study expands the known range of O. equestris by providing the first verification of its occurrence in Hawai‘i.

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Section: Discussionmentioning

confidence: 99%

Genetic analysis identifies theOstrea stentina/aupouria/equestrisoyster species complex in Hawai‘i, and resolves its lineage as the western PacificO. equestris

Sutton

Nishimoto

Schrader

et al. 2020

Preprint

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“…The latest market reports in 2016 reflect an increased trade in oysters, totaling about 70,000 tons, with an estimated price of US$ 20.6 by dozen, and $US 3.3 each ( Food and Agriculture Organization [FAO], 2017 ). According to Chen et al (2017) an oyster industry may be an economically viable pursuit if a minimum selling price of US$1.35 per oyster can be achieved. In México, the current market price for locally grown non-depurated oysters is US$0.10 per oyster ( Comisión Nacional de Acuacultura y Pesca [CONAPESCA], 2017 ).…”

Section: Discussionmentioning

confidence: 99%

Improved Microbial Safety of Direct Ozone-Depurated Shellstock Eastern Oysters (Crassostrea virginica) by Superchilled Storage

et al. 2018

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The effect of superchilled storage at -1°C on the microbial safety of oyster depurated with 0.2, 0.4, and 0.6 mg/L ozone was studied for 14 days. Fecal coliforms (4,100–16,000 MPN/100 g), Escherichia coli (1,500–3,650 MPN/100 g), Vibrio cholerae non-O1/non-O139 (13.0–102.0 MPN/g), and Salmonella spp. (2.270–3.035 × 103 CFU/g) were initially present in raw oysters. After 6 h depuration, fecal coliform counts decreased (P < 0.05) to 300, 20 and 20 MPN/100 g for 0.2, 0.4, and 0.6 mg/L treatments, while a 0.3 log decrease in control oysters was observed. Initial E. coli counts decreased (P < 0.05) in oysters to 50, 20, and 20 MPN/100 g for 0.2, 0.4, and 0.6 mg/L treatments, respectively. A 1 log reduction in V. cholerae non-O1/non-139 levels were observed in 0.4 and 0.6 mg/L-treatments after 2 and 4 h depuration. Salmonella spp. was not detected in oyster samples after 6 h depuration in 0.4 and 0.6 mg/L-ozone treatments. Considering the bacterial loads after depuration, at the end of superchilled storage the 0.4 mg/L-ozonated oysters attained lower (P < 0.05) fecal coliform levels (280 MPN/100 g) and E. coli counts in 0.4 and 0.6 mg/L-ozonated oysters (20 and 95 MPN/100 g, respectively). A 2-log decrease in V. cholerae non-O1/non-O139 levels on day 5 in 0.4 and 0.6 mg/L-ozonated oysters (< 0.3 MPN/g) was attained. V. cholerae non-O1/non-O139 counts in control oysters decreased 1 log on day 9 of superchilled storage. Salmonella spp. was not detected in ozonated and superchilled stored oysters. Levels of fecal coliforms, E. coli, Salmonella spp., and V. cholerae non-O1/non-O139 in non-ozone depurated oyster samples were higher than in control, 0.4 and 0.6 mg/L ozonated oyster samples during superchilled storage. The cumulative mortality rates after 14 days of storage for superchilled oysters (22.2%) was higher (P < 0.05) than 0.6 mg/L O3 (7.2%) and 0.4 mg/L O3 (5.8%) treatments, and control oysters (5.6%). pH values in control oysters decreased significantly (P < 0.05) throughout the storage period but not in oysters of both ozone treatments, indicating no detrimental effects on oyster survival. The results of this study suggest that superchilled storage enables ozonated shellstock oysters (0.4 mg/L-6 h) stored for 9 days to be safe human consumption.

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“…Total production costs (TPC) of D. iguape live baits of US$ 10,253.26 (Table 2) corresponded to 140% of the invested value, demonstrating high activity cost. Total operating costs (TOC) was US$ 9,620.46 (Table 2) and cash flow (CF) calculus was applied to estimate MIRR, NPV and ANPV (Martin et al, 1994;Brom and Balian, 2007;Tokunaga et al, 2015;Chen et al, 2017).…”

Section: Economic Analysismentioning

confidence: 99%

“…Tokunaga et al (2015) present MIRR of 7.36% for small-scale aquaponic production in Hawaii / US. In evaluating the viability of oyster production and trade in Hawaii / US, Chen et al (2017), obtained unsatisfactory MIRR values (-7.7%) to over a 10-year operating time horizon. Both studies applied financial and investment rates of 6.0%.…”

Section: Retail Value (Us$ Unit)mentioning

confidence: 99%

ECONOMIC FEASIBILITY FOR THE PRODUCTION OF LIVE BAITS OF LAMBARI (<i>Deuterodon iguape</i>) IN RECIRCULATION SYSTEM

et al. 2019

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Sport fishing is a growing segment in the fishing sector in Brazil. It is, however, an activity that depends upon young shrimp and fish offer to supply live bait demand, its extraction might result on overfishing and compromise natural stock. The intensive cultivation in water recirculation system is a worldwide trend for aquaculture, which, in addition to increasing productivity, minimizes the impact of effluent emission on the environment, reinforcing sustainability. This study analyzed the economic viability of establishing farms for the cultivation of lambari (Deutorodon iguape) in water recirculation system to meet the market demand of sport fishing for live baits. Twelve fiberglass tanks with a volume of 1500 L and a unit area of 1.32 m 2 (production units-PU) were installed in a total area of 130m 2. There were also six fiberglass tanks of 2,000 L capacity each, filled with water and 600 kg of clamshells acting as biological filter. Three production cycles were performed, each lasting 60 days. In each cycle 10,800 D. iguape fingerlings were added, acquired from local fish farming, at a 600 fish m-3 density, totalizing 900 fish per PU, with medium size and weight of 10 ± 1.2 mm e 1.1 ± 0.29 g. We used the following indicators: modified internal rate of return (MIRR), net present value (NPV), annualized net present value (ANPV) and payback period (PP). The best scenario, with 90% survival rate and unitary selling prices of US$ 0.30, showed MIRR 33.19%, NPV (10%) US$ 42,174.03, ANPV (10%) US$ 6,863.63 and PP 0.9 years, demonstrating be interesting the production of live baits in the conditions proposed in this study.

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Economic feasibility of producing oysters using a small-scale Hawaiian fishpond model

Cited by 23 publications

References 4 publications

Genetic analysis identifies theOstrea stentina/aupouria/equestrisoyster species complex in Hawai‘i, and resolves its lineage as the western PacificO. equestris

Genetic analysis identifies theOstrea stentina/aupouria/equestrisoyster species complex in Hawai‘i, and resolves its lineage as the western PacificO. equestris

Improved Microbial Safety of Direct Ozone-Depurated Shellstock Eastern Oysters (Crassostrea virginica) by Superchilled Storage

ECONOMIC FEASIBILITY FOR THE PRODUCTION OF LIVE BAITS OF LAMBARI (<i>Deuterodon iguape</i>) IN RECIRCULATION SYSTEM

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