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Your search keyword '"M. J., Madibana"' showing total 2 results
Start Over Author "M. J., Madibana" Topic aquaculture
2 results on '"M. J., Madibana"'

1. EFFECT OF VARIED DAILY FEEDING INTENSITIES ON GROWTH PERFORMANCE AND FEED UTILISATION OF SOUTH AFRICAN DUSKY KOB (ARGYROSOMUS JAPONICUS) JUVENILES REARED IN A RECIRCULATING AQUACULTURE SYSTEM.

Author

M. J., Madibana, V., Mlambo, B. R., Lewis, and Toefy, R.

Subjects
*FISH feeds, *AQUACULTURE, *FEEDING tubes, *UNSATURATED fatty acids, *WEIGHT gain, *PLANT proteins, *BODY weight, *SUSTAINABLE development
Abstract

Several aquaculture studies have concluded that feed constitutes the heaviest cost in aquaculture enterprises. Consequently, researchers continue to investigate strategies that can lower feed costs such as the use of protein rich plant sources and insect meals to partially or completely substitute the expensive fishmeal in aquafeeds. However, this approach has often faced numerous challenges such as anti-nutrients in plant protein sources that limit their use and suboptimal polyunsaturated fatty acids profile in terrestrial protein sources such as insect meal. Precision feeding is a strategy that could also reduce aquafeed feed costs and enhance the economic sustainability of aquaculture. There is discordance regarding the feeding intensity that should be used for fish such as dusky kob. The current study was designed to compare the effect of three feeding intensities (2.8 %, 3.5 % and 4 % of body weight (BW)) on growth performance and feed utilisation of juvenile dusky kob (Argryrosomus japonicus). Dusky kob juveniles were randomly and evenly allocated to 18 tanks with a volume of 465 L. Each feeding intensity was randomly allocated to six tanks carrying 66 fish each. The average temperature and dissolved oxygen were 25°C and 5.5-6.0 mg/l, respectively. Commercial dusky kob diet was offered twice daily at the rate of 2.8%, 3.5% and 4% of body weight (BW). A feeding intensity × fish age (weeks) interaction effect was noted on fish feed intake (P<0.05) but not on weight gain, feed conversion ratio (FCR), and specific growth rate (SGR). The overall weight gain after six weeks of feeding was similar across the three feeding intensities (P>0.05). The 2.8% BW feeding rate promoted 1.06%/day SGR as compared to 1.21%/day and 1.48%/day for 3.5% and 4.0% BW feeding rates, respectively. Similar weight gains and FCR recorded across the three feeding intensities may suggest that the lowest feeding intensity (2.8% BW) should be used for dusky kob feeding to reduce feeding costs. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Challenges facing emerging aquaculture entrepreneurs in South Africa and possible solutions

Author

M. J. Madibana, C. M. Mnisi, and C. H. Fouché

Subjects
Economic growth, Government, Entrepreneurship, business.industry, 0402 animal and dairy science, Capacity building, Legislation, 04 agricultural and veterinary sciences, Private sector, 040201 dairy & animal science, Aquaculture, 040102 fisheries, 0401 agriculture, forestry, and fisheries, Aquaculture in South Africa, Business, Human resources
Abstract

Despite aquaculture being hailed as the fastest growing farming sector in the world, South African aquaculture is still lagging behind. This article aims to highlight challenges (mostly beyond their control) that South Africa’s emerging aquaculture entrepreneurs have to endure in order to find a breakthrough into the industry. Availability of necessary resources such as land, water, infrastructure,financial support and access to markets, as well as crime are among challenges faced by these entrepreneurs on a daily basis. Limited human resources in capacity building, skills and aquaculture expertise also hinders the development and expansion of aquaculture in South Africa. Complex legislation governing aquaculture further limits the development of this sector to prospective investors. Fish and machinery theft in fish farms has an adverse effect, which had resulted in many enterprises closing down in recent years. South Africa is not a traditional fish-eating nation and this phenomenon has seen many emerging entrepreneurs struggling to locally commercialize their produce. It is well known that fish consumption provides human nutrition with essential nutrients necessary for normal body function. Thus,aquaculture has the potential to contribute to food and nutrition security and alleviate poverty in rural communities. However, plenty of initiatives need to be developed by government and the private sector to develop a sustainable aquaculture industry. These initiatives should involve the establishment of an aquaculture friendly legislation that would support emerging aquaculture entrepreneurs. Several financial institutions view aquaculture as a high-risk business,and as a consequence,decline financial support or loan requests from emerging farmers.Focused research as a strategic initiative to develop aquaculture species that would be first priority for local markets is encouraged. This article explores the challenges facing emerging entrepreneurs and suggests possible solutions that might assist in the development of the aquaculture sector in South Africa. We postulate that constructive and regular engagements between the government and private sector is a key to a sustainable and prosperous aquaculture sector in South Africa.

Published
2020

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