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Titolo:
Use of GnRHa-delivery systems for the control of reproduction in fish
Autore:
Mylonas, CC; Zohar, Y;
Indirizzi:
Inst Marine Biol Crete, Iraklion 71003, Crete, Greece Inst Marine Biol Crete Iraklion Crete Greece 71003 n 71003, Crete, Greece Univ Maryland, Inst Biotechnol, Ctr Marine Biotechnol, Baltimore, MD 21202USA Univ Maryland Baltimore MD USA 21202 e Biotechnol, Baltimore, MD 21202USA
Titolo Testata:
REVIEWS IN FISH BIOLOGY AND FISHERIES
fascicolo: 4, volume: 10, anno: 2001,
pagine: 463 - 491
SICI:
0960-3166(2001)10:4<463:UOGSFT>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
GONADOTROPIN-RELEASING-HORMONE; FINAL OOCYTE MATURATION; HUMAN CHORIONIC-GONADOTROPIN; BASS MORONE-SAXATILIS; PELLETED LHRH ANALOG; PSEUDOPLEURONECTES-AMERICANUS WALBAUM; FLOUNDER PLEURONECTES FERRUGINEUS; SALMON ONCORHYNCHUS-KISUTCH; TRUMPETER LATRIS-LINEATA; JUVENILE RAINBOW-TROUT;
Keywords:
aquaculture; delivery systems; GnRHa; implants; induced spawning;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
197
Recensione:
Indirizzi per estratti:
Indirizzo: Mylonas, CC Inst Marine Biol Crete, POB 2214, Iraklion 71003, Crete, Greece Inst Marine Biol Crete POB 2214 Iraklion Crete Greece 71003 ce
Citazione:
C.C. Mylonas e Y. Zohar, "Use of GnRHa-delivery systems for the control of reproduction in fish", REV FISH B, 10(4), 2001, pp. 463-491

Abstract

The most commonly observed reproductive dysfunctions in cultured fish are the unpredictability of final oocyte maturation (FOM) in females, and the diminished volume and quality of sperm in males. Gonadotropin-releasing hormone agonists (GnRHa) have been used extensively in order to stimulate the release of pituitary luteinizing hormone (LH) required to induce FOM, ovulation and spermiation. Because multiple hormonal treatments are often necessary for a successful response, fish must be monitored and handled extensively, which is labor intensive, stressful to the fish and can often result in broodstock mortalities. To ameliorate this problem, sustained-release delivery systems for GnRHa have been developed during the last two decades and have been increasingly applied in controlling reproduction of a variety of cultured fish. Solid implants of cholesterol or poly[ethylene-vinyl acetate], and biodegradable microspheres of poly[lactide-glycolide] or poly[fatty acid dimer-sebasic acid] release GnRHa for a period of time (from a few daysto many weeks. ) GnRHa-delivery systems do not cause desensitization of thepituitary gonadotrophs in fish, and by stimulating a sustained elevation of plasma LH they induce the natural progression of plasma steroid increasesassociated with FOM and spermiation. This method has been used with very encouraging results in females of more than 40 cultured species and has beeneffective in inducing FOM, ovulation or spawning in fish with synchronous,group-synchronous and asynchronous ovarian development. In males, GnRHa-delivery systems have been tested in more than 20 species, producing significant increases in milt production for up to 5 weeks. Future research should focus on the optimization of this technology in terms of (a) using the mostpotent GnRHa, (b) identifying the most appropriate GnRHa release kinetics according to the reproductive biology of different species, and (c) determining minimum effective doses. Developments in these areas will greatly enhance the effectiveness and efficiency of GnRHa-delivery systems, while at the same time reducing their cost thus making them more affordable to the aquaculture industry.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 12:07:00