Bio-economic modeling of fishing activities in Kenya: the case of Lake Naivasha Ramsar site

Obegi, Beatrice; Sarfo, Isaac; Morara, George N.; Boera, Priscilla; Waithaka, Edna; Mutie, Alice

doi:10.1007/s10818-019-09292-2

Cited by 3 publications

(4 citation statements)

References 21 publications

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“…A obtenção de juros anual em 5.90% ao ano, por meio de empréstimo bancário, permitiu maior margem para a administração financeira do projeto. Geralmente, os estímulos para o setor agrícola dados pelos subsídios auxiliam na diminuição da margem de custos iniciais, os quais são influenciados pelo tempo de carência para início do pagamento do financiamento e os baixos juros empregados (Brande, et al, 2019;Obegi, et al, 2020). Além dos investimentos iniciais, as descrições das despesas operacionais (capital de giro) para produção anual das carpas demonstraram que os itens que influenciam no COT, foram mão de obra contratada, larvas, Research, Society andDevelopment, v. 11, n. 12, e08111233797, 2022 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v11i12.33797 insumos, assistência técnica e rações.…”

Section: Discussionunclassified

Viabilidade econômica da produção de carpa Nishikigoi (Cyprinus carpio L.) para o mercado Pet brasileiro de peixes ornamentais

Machado

Trombeta²,

Camargo³

et al. 2022

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A comercialização de organismos aquáticos ornamentais se destaca entre os vários segmentos do mercado Pet no Brasil. Dentre as diversas espécies utilizadas para a aquariofilia, as carpas coloridas, conhecidas como Koi ou Nishikigoi (Cyprinus Carpio L.), representam a principal espécie comercializada no país. Neste contexto, o presente estudo realizou a análise da viabilidade econômica da produção de carpa Nishikigoi em uma piscicultura comercial instalada na região metropolitana de São Paulo que comercializa animais para o mercado Pet brasileiro de peixes ornamentais. Avaliaram-se três hectares de lâmina de água durante dez ciclos de produção por ano. Neste período, foram obtidos os custos totais de produção (CT) e os custos operacionais efetivos (COE) e custos operacionais totais (COT), acrescidos dos custos fixos para operacionalização deste agronegócio. Indicadores econômicos foram aplicados para avaliar a viabilidade de investimento no negócio por meio da taxa interna de retorno (TIR), valor presente líquido (VPL), período de retorno do capital (PRC) e relação custo-benefício do investimento (RCB). A projeção de investimento inicial foi de ̴2.3 milhões de reais. Os indicadores econômicos de viabilidade mais expressivos foram obtidos pelo TIR de 10.41% ao ano e VPL de aproximadamente 1.6 milhões de reais, considerando o fluxo líquido de caixa para o período de dez anos. O período de retorno do capital investido poderá ser alcançado em 7.15 anos com um RBC em 1.68 reais. Dessa maneira, o cenário estudado demostrou a viabilidade de investir neste agronegócio sendo um empreendimento promissor do setor da aquicultura.

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Section: Discussionunclassified

Viabilidade econômica da produção de carpa Nishikigoi (Cyprinus carpio L.) para o mercado Pet brasileiro de peixes ornamentais

Machado

Trombeta²,

Camargo³

et al. 2022

RSD

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“…These studies estimated the maximum sustainable yield (MSY) ranged between 341 and 889 t/yr, with an optimal fishing effort of about 51 boats. Following the recent fish stocks enhancement through the introduction of Nile tilapia ( Oreochromis niloticus ) and African catfish ( Clarias gariepinus ), a study by Obegi et al (2020) observed that the current number of 176 licensed fishing boats were already beyond the optimal fishing effort (<125 boats) for a sustainable fishery. Without effective MCS strategies, therefore, the impacts of illegal fishing in the already‐stressed fishery of Lake Naivasha are likely more severe than estimated, with additional fishing effort and capacity attributable to the high number of illegal fishing gillnets.…”

Section: Discussionmentioning

confidence: 99%

Illegal unregulated and unreported fishing: Methods and increasing trends in Lake Naivasha, Kenya

et al. 2021

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Illegal, unregulated and unreported (IUU) fishing is a negative social vice that adversely affects global capture fishery production. The inadequate disclosure of IUU methods and trends in fishery waters hampers management actions to curb illegal fishing activities. Seldom have empirical studies been conducted on IUU methods and their trends in Lake Naivasha. Therefore, this study analysed data on the fisheries monitoring, control and surveillance (MCS) during 2012 to 2018 to test for the significance of trends, and compare the enforcement plans to seizures of illegal fishing gear in the lake. The IUU fishing methods included both the types of equipment and the means used to perpetrate illicit capture or acquisition of fish from the lake. The results indicate a 37% reduction of MCS enforcement patrols during 2018 compared to 2012, and a 16% to 100% upsurge in the quantity of seized IUU fishing items. Illegal fishing boats potentially threaten the fishery of Lake Naivasha with an additional fishing effort of 22% above the 176 licensed boats. An average of 10,700 fishing nets seized per year has the potential fishing intensity of 74 gillnets/km2 against an ideal intensity of 12 gillnets/km2. The frequencies of MCS patrols in Lake Naivasha exhibit no particular trends and likely ineffective in deterring the upsurge of IUU activities, or the evolution of new illegal fishing methods. An increased seizure of illegal fishing boats, outboard engines and gillnets could imply their rampant use in IUU fishing activities. These findings merit a multi‐stakeholder participatory approach to identifying the MCS weaknesses and opportunities for sharing resources to strengthen the fishery management efforts in Lake Naivasha.

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“…Introduction of the new fish species may have elicited an increased resource exploitation level, with an increasing number of fishing boats and capacity (Njiru et al, 2017;Obegi et al, 2020;Waithaka et al, 2019). This situation suggests the need for an indepth assessment of the changes in fishery resources composition and exploitation levels for sustainable conservation and wise use of the Lake Naivasha fish stocks.…”

Section: O Niloticusmentioning

confidence: 99%

“…An artisanal fishery of Lake Naivasha supports a local economy, including the livelihoods of more than 4000 people that depend on the resource (Obegi et al, 2020). The fishery has evolved through various development phases in both fish yield and exploitation levels Muchiri & Hickley, 1991).…”

mentioning

confidence: 99%

Shifts in composition of fish species of fishery in Lake Naivasha, Kenya: Trend implications for fishing effort, yields and revenue

et al. 2022

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Fishery resources are an essential component of the socioeconomic development of many countries, especially developing countries, because they provide a source of nutrition and food security, employment and livelihood opportunities for the local communities (Welcomme et al., 2010; Youn et al., 2014). Inland waters are endowed with high (>12,700) fish species diversity (Funge-Smith, 2018), supporting local livelihoods and food security in many nations. Globally, inland water fish captures have exhibited a steady yearly increase, with over 12 million tonnes reported in 2018 (FAO, 2020). The FAO indicated that nations endowed with important water bodies and river basins have inland captures more concentrated than marine captures. Of the total global inland capture fishery production, Asia

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Bio-economic modeling of fishing activities in Kenya: the case of Lake Naivasha Ramsar site

Cited by 3 publications

References 21 publications

Viabilidade econômica da produção de carpa Nishikigoi (Cyprinus carpio L.) para o mercado Pet brasileiro de peixes ornamentais

Viabilidade econômica da produção de carpa Nishikigoi (Cyprinus carpio L.) para o mercado Pet brasileiro de peixes ornamentais

Illegal unregulated and unreported fishing: Methods and increasing trends in Lake Naivasha, Kenya

Shifts in composition of fish species of fishery in Lake Naivasha, Kenya: Trend implications for fishing effort, yields and revenue

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