Mangrove oyster farming: Prospects as supplementary livelihood  for a Ghanaian fishing community

Asare, Bright; Obodai, Edward Adzesiwor; Acheampong, Emmanuel

doi:10.5455/jfcom.20190311090846

Cited by 19 publications

(28 citation statements)

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“…Perhaps, a ner mesh-size material adapted to a more stable setup in the water column may produce positive results. Previous studies have demonstrated the use of wall tiles (Yankson, 1974), oyster shells (Yankson, 1974;Obodai, 1990) and coconut shells (Asare et al, 2019;Obodai, 1990), for collecting C. tulipa spat in lagoons and estuaries in Ghana. PVC was used to collect spat of other species of oysters; Crassostrea gigas in Wales (Laing and Earl, 1998), Crassostrea virginica in Georgia (Manley et al, 2008) and Pinctada maxima in Indonesia (Taylor et al, 1998a(Taylor et al, , 1998b(Taylor et al, , 1997.…”

Section: Discussionmentioning

confidence: 99%

“…Based on eld surveys and previous reports on thriving populations of C. tulipa in Ghana (Asare et al, 2019;Janha et al, 2017;Obodai and Yankson, 2002;Yankson, 1990), four coastal waters bodies were selected for this study ( Figure 2). These were the Densu Delta (0°16′43″ W, 5°34′07″ N and 0°20′02″ W, 5°30′21″ N), Narkwa Lagoon (0°56′22″ W, 5°12′17″ N and 0°54′41″ W, 5°12′32″ N), Benya Lagoon (1°20′50″ W, 5°04′59″ N and 1°21′26″ W, 5°05′18″ N) and Whin Estuary (1°46′47″ W, 4°52′52″ N and 1°46′04″ W, 4°52′30″ N).…”

Section: Study Sites Experimental Design and Data Collectionmentioning

confidence: 99%

“…The mangrove oyster, Crassostrea tulipa, serves as a major source of animal protein for many coastal communities in West African (Adite et al, 2013;Asare et al, 2019). The shells are also used in the indigenous production of paints, traditional medicine and concrete for building (Yankson, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…The culturabiliy of C. tulipa has been established within the last three decades (Kamara, 1982;Yankson, 1990). Recent studies have also farmed the oyster to marketable size within a reasonable period of time using cultches prepared from coconut shells (Asare et al, 2019). However, efforts towards large-scale culture of C. tulipa are impeded by myriad factors including inadequate scienti c data on the local hydrodynamic conditions that promote the recruitment, larval export to new favourable areas, and suitable microhabitats for its growth.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating the effectiveness of local materials for the wild oyster (Crassostrea tulipa Lamarck, 1819) spat collection in four coastal waterbodies in Ghana

Chuku¹,

Yankson²,

Obodai³

et al. 2020

Preprint

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The West African mangrove oyster, Crassostrea tulipa (Lamarck, 1819), has the potential to improve global shellfish food production and is being considered for commercial farming in many countries in West Africa. The current background information to support this venture is, however, inadequate especially with respect to identification of suitable materials for optimal collection of spat for large-scale production. We assessed the effectiveness of five locally available materials (coconut shell, oyster shell, nylon mesh, PVC, and ceramic tile) for harvesting C. tulipa spat from the Densu Delta, Narkwa Lagoon, Benya Lagoon and Whin Estuary, along the coast of Ghana from November 2017 to October 2018. Ceramic tile had the highest mean monthly spat settlement in the Narkwa Lagoon (3451 ± 206 spat m-2), Benya Lagoon (1769 ± 145 spat m-2) and Whin Estuary (373.1 ± 52.4 spat m-2). This settlement was not significantly different from settlement on PVC slats (P > 0.05). Coconut shell consistently had the least C. tulipa spatfall in all four coastal water bodies (P < 0.05). The under-horizontal surfaces of collectors, [mean (S.E.); 2523.7 ± 66.9 spat m-2] had significantly more C. tulipa spatfall than upper-horizontal surfaces [mean (S.E.); 775.2 ± 33.4 spat m-2] in the main experiment (P = 0.000). In a separate experiment, a change of orientation from “Face down”/0° to “Face up”/180° did not change the observed profuse under-horizontal settlement of C. tulipa spat on the collectors, suggesting that under-horizontal surfaces were more attractive to C. tulipa spat. Larger-sized C. tulipa spat on under-horizontal surfaces, mean (S.E.) 9.88 ± 0.5 mm, compared to upper-horizontal surfaces, mean (S.E.) 5.99 ± 0.5 mm, of the collectors suggest earlier settlement on the undersides. Ceramic tiles and PVC slats were the most effective materials for C. tulipa spat collection, hence, their use recommended for large-scale C. tulipa farming.

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Section: Discussionmentioning

confidence: 99%

Section: Study Sites Experimental Design and Data Collectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluating the effectiveness of local materials for the wild oyster (Crassostrea tulipa Lamarck, 1819) spat collection in four coastal waterbodies in Ghana

Chuku¹,

Yankson²,

Obodai³

et al. 2020

Preprint

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“…There is an increasing interest in oyster culture in the tropics and for that matter Ghana because of the awareness of its potential as a renewable resource that provides protein and needed artisanal occupation (Obodai & Yankson, 2002;Yankson, 2004;Asare et al, 2019;Osei et al, 2020). Existing literature on the West African mangrove oyster, Crassostrea tulipa (Lamarck, 1819), in Ghana indicate that the species is suitable for mass cultivation (Yankson, 1990;Obodai & Yankson, 2000;Yankson, 2004;Osei et al, 2021) and in other West African countries like Nigeria (Ajana, 1979;Ansa & Bashir, 2007), Sierra Leone (Kamara, 1982), Senegal (Diadhiou & Ndour, 2017) and the Gambia (Njie & Drammeh, 2011).…”

Section: Introductionmentioning

confidence: 99%

Growth and survival performance of the West African mangrove oyster, Crassostrea tulipa cultivated by suspension and bottom culture methods in the Densu Estuary, Ghana

Osei

Yankson

Obodai

2021

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This study compares the efficacy of suspension and bottom culture methods of the West African mangrove oyster, Crassostrea tulipa, on recycled oyster shell cultches in connection with some environmental factors in the Densu Estuary, Ghana, from December 2017 to July 2018. Oyster spat grew up to 5.56 ± 0.10 cm SH for suspension and 4.60 ± 0.14 cm SH for bottom culture on the convex surfaces of oyster shell cultches, whereas oysters cultured on the concave surfaces by suspension and bottom cultured measured 5.59 ± 0.14 cm SH and 4.68 ± 0.14 cm SH, respectively. There was a significant difference (F = 36.26, p = 0.001) between the growth rate of oysters cultured on convex surfaces of cultches by suspension (0.80 ± 0.23 cm/month) and bottom culture (1.02 ± 0.24 cm/month). The growth rate of cultured oysters on concave surfaces of cultches by suspension (1.00 ± 0.24 cm/month) was significantly better (F = 22.32, p < 0.001) than the bottom approach (0.81 ± 0.23 cm/month). Before the extermination of oysters cultured on the bottom in July 2018, there was no significant difference in the survival of oysters cultured by suspension and bottom methods on the convex (χ2 = 0.06, p = 0.99) and concave surfaces (χ2 = 0.19, p = 0.99). Of the physico-chemical factors monitored, oyster growth and survival were significantly influenced by DO (p = 0.004; 0.039) and salinity (p = 0.027; 0.012), respectively. Suspension culture approach should be preferred over the bottom culture, especially for water bodies with low bulk density.

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Isolation and evaluation of local microalgal isolates as feed for larval rearing of Crassostrea tulipa towards optimisation of mangrove oyster seed production in Ghana

Krampah,

Mensah,

Acheampong

et al. 2024

Aquaculture Fish & Fisheries

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This study explored the potential of three local microalgal isolates as feed for oyster larvae in laboratory‐rearing experiments, towards the optimisation of seed production of Crassostrea tulipa to support its large‐scale farming along the West African coast. Three species of local microalgae—Rhodomonas sp., Nannochloropsis sp. and Pseudanabaena sp.—were isolated from waters off the coast of Ghana, West Africa, following a serial dilution technique. The growth performance of the isolates was assessed in the laboratory through daily estimation of cell density until the stationary phase was observed. Characterisation of the microalgal isolates was carried out by estimation of their biovolume, carbon content and energy content. Biovolumes of the microalgae were calculated from the estimated equivalent spherical diameters using proposed geometric shapes and formulae. Carbon weight and carbon energy content were subsequently calculated using derived conversions. The three microalgal isolates showed potential for large‐scale cultivation in the laboratory with marked differences in daily increases in cell densities. Nannochloropsis sp. and Rhodomonas sp. recorded the highest and the lowest peak densities of 2.4 × 105 and 1.5 × 105 cell mL−1, respectively, from an initial inoculating cell density of 1.05 × 105 cell mL−1. The estimated mean biovolumes of Rhodomonas sp., Nannochloropsis sp. and Pseudanabaena sp. were 238.9, 8.182 and 42.42 µm3, respectively, and the corresponding derived carbon energy contents were 1.7 × 10−6, 7.13 × 10−8 and 1.05 × 10−7 J, respectively. Results from a laboratory rearing experiment indicated that the individual microalgal isolates supported the growth and survival of oyster larvae at different scales, but a mixed diet of the three promoted superior growth and survival of C. tulipa larvae. The three local microalgal isolates‐ Rhodomonas sp., Nannochloropsis sp., and Pseudanabaena sp.‐ were well adapted to laboratory culture conditions, and the observed differences in growth and survival of the oyster larvae fed on these algal diets could be due to the differences in diet properties and biochemical compositions of the different species. A combination of the three algal diets, however, provided complementaery nutrients for the optimal growth and survival of C. tulipa larvae. The outcome of this study shows that local microalgal isolates have the potential to support hatchery rearing of C. tulipa, which is essential for the development of commercial mangrove oyster aquaculture in West Africa.

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Mangrove oyster farming: Prospects as supplementary livelihood for a Ghanaian fishing community

Cited by 19 publications

References 8 publications

Evaluating the effectiveness of local materials for the wild oyster (Crassostrea tulipa Lamarck, 1819) spat collection in four coastal waterbodies in Ghana

Evaluating the effectiveness of local materials for the wild oyster (Crassostrea tulipa Lamarck, 1819) spat collection in four coastal waterbodies in Ghana

Growth and survival performance of the West African mangrove oyster, Crassostrea tulipa cultivated by suspension and bottom culture methods in the Densu Estuary, Ghana

Isolation and evaluation of local microalgal isolates as feed for larval rearing of Crassostrea tulipa towards optimisation of mangrove oyster seed production in Ghana

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Mangrove oyster farming: Prospects as supplementary livelihood for a Ghanaian fishing community

Cited by 19 publications

References 8 publications

Evaluating the effectiveness of local materials for the wild oyster (Crassostrea tulipa&nbsp;Lamarck, 1819) spat collection in four coastal waterbodies in Ghana

Evaluating the effectiveness of local materials for the wild oyster (Crassostrea tulipa&nbsp;Lamarck, 1819) spat collection in four coastal waterbodies in Ghana

Growth and survival performance of the West African mangrove oyster, Crassostrea tulipa cultivated by suspension and bottom culture methods in the Densu Estuary, Ghana

Isolation and evaluation of local microalgal isolates as feed for larval rearing of Crassostrea tulipa towards optimisation of mangrove oyster seed production in Ghana

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Evaluating the effectiveness of local materials for the wild oyster (Crassostrea tulipa Lamarck, 1819) spat collection in four coastal waterbodies in Ghana

Evaluating the effectiveness of local materials for the wild oyster (Crassostrea tulipa Lamarck, 1819) spat collection in four coastal waterbodies in Ghana