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Titolo:
Research on abalone (Haliotis midae L.) cultivation in South Africa
Autore:
Sales, J; Britz, PJ;
Indirizzi:
Rhodes Univ, Dept Ichthyol & Fisheries Sci, ZA-6140 Grahamstown, South Africa Rhodes Univ Grahamstown South Africa ZA-6140 0 Grahamstown, South Africa
Titolo Testata:
AQUACULTURE RESEARCH
fascicolo: 11, volume: 32, anno: 2001,
pagine: 863 - 874
SICI:
1355-557X(200111)32:11<863:ROA(ML>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
ARTIFICIAL WEANING DIET; GROWTH-PERFORMANCE; PROTEIN; FEED; SUITABILITY; CULTURE; LEVEL; FISH;
Keywords:
abalone; cultivation; South Africa; Haliotis midae L.;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Sales, J Rhodes Univ, Dept Ichthyol & Fisheries Sci, POB 94, ZA-6140 Grahamstown, South Africa Rhodes Univ POB 94 Grahamstown South Africa ZA-6140 South Africa
Citazione:
J. Sales e P.J. Britz, "Research on abalone (Haliotis midae L.) cultivation in South Africa", AQUAC RES, 32(11), 2001, pp. 863-874

Abstract

Although abalone fisheries in South Africa have existed since 1949, cultivation started by successful spawning of captured specimens in 1981 to produce spat and juveniles. Twelve abalone farms, with an estimated investment of US$12 million, have since been established on the coast of South Africa, with a projected production of 500-800 tons. While Haliotis midae could reach a maximum size of about 200 mm shell length at an age of over 30 years in the wild, farm production is concentrating on an average size of 100 mm after 5 years. Growth rates of 0.08-4.5% body weight day(-1) for abalone of 10-17 mm shell length have been found under stimulated farming conditions on formulated diets. while the corresponding feed conversion ratio (FCR) was0.9-2.4. Growth rate, FCR and protein efficiency ratio decline at water temperatures above 20 degreesC. Anaesthetics, for example magnesium sulphate,are used to prevent injury during removal from tanks. Prostrate diatoms, such as Cocconeis sublittoralis (Hendey), Amphora proteoides (Hustedt) and Achnanthes brevipes (Agardh) are preferred after the larval stage (5-7 days,depending on temperature) are finished. South Africa abalone growers prefer formulated feeds in pellet form, which is convenience and cost favourableto farm operations and management. Although fish meal has been found to bethe most suitable protein source for inclusion in formulated diets, plant proteins such as soy bean meal, cottonseed meal and sunflower meal presented good growth and apparent protein digestibility. The parasite sabellid polychaete, Terebrasabella heterouncinata, recently named by Australian and American researchers, is indigenous to a variety of South African intertidal molluscs and impedes growth by causing irritation beneath the mantle in abalone. Prevention to some degree is possible by high standards of hygiene and husbandry of abalone in the tanks, but new techniques to control large infestations now include ultrasound. In spite or a reputation for toughness, abalone meat frozen immediately after shucking is tender relative to red meat. The success of abalone farming in South Africa has been as a result of a high degree of cooperation between the private sector and government-back-ed research institutions, and it is anticipated that this collaboration will continue.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 16:43:45