A Review of Comparative Advantage Assessment Approaches in Relation to Aquaculture Development

Cai, Junning; Leung, PingSun

doi:10.1002/9780470277867.ch4

Cited by 8 publications

(11 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4 ) which is reflected in the intensity of global animal production (e.g., Gilbert et al, 2018). Countries with high asset and output values typically have a comparative advantage for farm animal production (e.g., availability of land, water, labour, technology/skills) (e.g., Cai and Leung, 2008 ; Cattaneo, 2008 ). These countries commonly engage in the international trade of live animals and animal outputs (e.g., USA, Brazil, Canada, Australia) ( FAO, 2021a , see trade table) particularly if they have the wealth, governance and political influence needed to obtain widespread export market access.…”

Section: Discussionmentioning

confidence: 99%

Approximating the global economic (market) value of farmed animals

Schrobback,

Dennis,

et al. 2023

Global Food Security

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Approximating the global economic (market) value of farmed animals

Schrobback,

Dennis,

et al. 2023

Global Food Security

View full text Add to dashboard Cite

“…In Rwanda, young people comprise 44.2% of the population and over 50% of the population in Africa is below 25 years of age (FAO 2014;NISR 2019). Young men are often employed as casual part-time workers, e.g., in pond construction and fish harvesting, while young women play a larger role in post-harvest steps but are often limited to sales and marketing (Cai, Leung, and Hishamunda 2009). Efforts are needed to achieve a more equal gender distribution in aquaculture and better integration of young people early on.…”

Section: General Description Of Survey Respondents and Farm Owner Str...mentioning

confidence: 99%

Evaluation of locally available feed resources for Nile tilapia (Oreochromis niloticus) in Rwanda

Niyibizi¹

2023

Acta Universitatis Agriculturae Sueciae

View full text Add to dashboard Cite

Aquaculture was introduced in Rwanda in the 1940s as an extensive pond-based system but the sector has gained in popularity during the past two decades, resulting in greater numbers of fish ponds and a corresponding increase in demand for quality fish feeds for sustainable aquaculture production. The aim of this thesis was to identify, sample and evaluate the nutritive value of some locally available feed ingredients that could be used by fish farmers producing Nile tilapia. An initial countrywide survey revealed that a semi-intensive farming system prevails (81% of total production) in Rwanda, three main fish species are cultured (Nile tilapia (Oreochromis niloticus) (most common), common carp (Cyprinus carpio) and North African catfish (Clarias gariepinus)) and around 31 feed ingredients are used, either individually or in mixtures in supplementary tilapia feeds. The nutrient content of local feed resources was evaluated. Digestibility trials in which fishmeal protein (reference diet, RD) was partly replaced with protein from spent brewer’s grain (SBG), spent brewer’s yeast (SBY), sweet potato leaf meal (SPLM), kidney bean leaf meal (KBLM) or wheat middlings (WM) showed that apparent digestibility (AD) of crude protein was highest for diets with SPLM and SBG (83%), followed by RD and SBY (78-82%) and then KBLM and WM (69-73%). Mean AD of indispensable amino acids (ADIAA) in the experimental diets was high (range 73-87%), and was above 81% for SPLM, SBG,RD and SBY. Weight gain, final body weight and specific growth rate were high and comparable to the control in fish fed SPLM, SBY, and SBG, but low in fish fed WM and KBLM. Hepato-somatic index and viscero-somatic index did not differ between diets, but red and white blood cell counts indicated a tendency for possible negative effects of KBLM on blood physiology in tilapia. These results suggest that SPLM, SBY, and SBG protein can replace fishmeal in Nile tilapia diets without compromising growth, feed utilisation or body indices, thus acting as a valuable local protein source for sustainable tilapia production.

show abstract

“…The third indicator measures the diversity of aquaculture countries by the "effective number of countries": 1 where n (≥ 0) denotes the total number of aquaculture countries; denotes each country's share in world aquaculture production; and the summation term is the Shannon-Wiener (entropy) index (a widely used diversity index). Similar to the effective number of species that measures the diversity of species in an ecosystem 16,17 or aquaculture production system 18,19 , or the effective number of parties that measures the diversity of political forces in a political system 20,21 , the ENC here measures the diversity of national producers in global aquaculture.…”

Section: Indicator 3: Effective Number Of Countries (Enc) As a Measur...mentioning

confidence: 99%

Popularity and parity: towards more inclusive and balanced aquaculture

Cai¹,

Leung

2023

Preprint

Self Cite

View full text Add to dashboard Cite

Aquaculture is an emerging, fast-growing, and diverse food production system that could enhance food security and nutrition and add resilience to the global food system. Yet imbalanced aquaculture growth has resulted in a highly uneven distribution of aquaculture production among countries, which is essentially a lack of diversity in the source of aquaculture production. While the issue has been recognized as an undesirable feature of aquaculture development, there has yet to be a comprehensive assessment, not even a formal measure of such imbalance. This paper develops an indicator system to assess production distribution among countries and regions. The assessment framework uses the “effective number of countries” (ENC) as a diversity measure and extends it into two key indicators (i.e. popularity and parity) to measure the inclusiveness of a production system and the balance of production distribution. The assessment reveals that global aquaculture development 1970–2020 has raised its overall popularity to a high plateau (~ 85 percent) thanks to finfish farming, yet aquaculture popularity still has much room to grow for nearly all 43 species groups examined here. While the inclusive yet imbalanced aquaculture growth has reduced global aquaculture parity to below 3 percent, aquaculture has experienced a balanced growth in most of all 85 country groups examined, and the global parity has been on an upward trend since the new millennium 2000–2020. However, in most of the 85 country groups, the parity of aquaculture is still much lower than those of capture fisheries and terrestrial meat production, indicating that low aquaculture parity cannot be fully attributed to discrepancies in countries’ characteristics, such as geographic location and climate, resource endowments, demographics, socioeconomic conditions, and development status. The highly uneven distribution of aquaculture production could undermine its widely expected role in enhancing food security and nutrition, and weaken the resilience of the global food system against various risks. The unevenness, however, indicates a large untapped potential for further aquaculture growth. Aquaculture popularity and parity could be mainstreamed as performance indicators in policymaking and sector management to facilitate more inclusive aquaculture development, enhance the resilience of the global food system, and unlock aquaculture growth potential. The indicator system can be applied in sector assessment and monitoring of any sector or at different levels (e.g. subnational). While only key findings are highlighted in the main text, the comprehensive results of the assessment is documented in the supplementary materials to facilitate further study.

show abstract

A Review of Comparative Advantage Assessment Approaches in Relation to Aquaculture Development

Cited by 8 publications

References 33 publications

Approximating the global economic (market) value of farmed animals

Approximating the global economic (market) value of farmed animals

Evaluation of locally available feed resources for Nile tilapia (Oreochromis niloticus) in Rwanda

Popularity and parity: towards more inclusive and balanced aquaculture

Contact Info

Product

Resources

About