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Titolo:
Effects of osmolality and ions on the motility of stripped and testicular sperm of freshwater- and seawater-acclimated tilapia, Oreochromis mossambicus
Autore:
Linhart, O; Walford, J; Sivaloganathan, B; Lam, TJ;
Indirizzi:
Natl Univ Singapore, Dept Biol Sci, Singapore 119260, Singapore Natl Univ Singapore Singapore Singapore 119260 ngapore 119260, Singapore Univ S Bohemia, Res Inst Fish Culture & Hydrobiol, Vodnany 38925, Czech Republic Univ S Bohemia Vodnany Czech Republic 38925 odnany 38925, Czech Republic
Titolo Testata:
JOURNAL OF FISH BIOLOGY
fascicolo: 6, volume: 55, anno: 1999,
pagine: 1344 - 1358
SICI:
0022-1112(199912)55:6<1344:EOOAIO>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
TROUT SPERM; RAINBOW-TROUT; SPERMATOZOA; INITIATION; POTASSIUM; MOVEMENT; CARP; PH; FERTILIZATION; PADDLEFISH;
Keywords:
Oreochromis mossambicus; tilapia; spermatozoa; velocity; motility;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Linhart, O Natl Univ Singapore, Dept Biol Sci, Lower Kent Ridge Rd, Singapore 119260,Singapore Natl Univ Singapore Lower Kent Ridge Rd Singapore Singapore 119260
Citazione:
O. Linhart et al., "Effects of osmolality and ions on the motility of stripped and testicular sperm of freshwater- and seawater-acclimated tilapia, Oreochromis mossambicus", J FISH BIOL, 55(6), 1999, pp. 1344-1358

Abstract

A significantly higher concentration of testicular spermatozoa was obtained from freshwater Oreochromis mossambicus (9.9 x 10(9) spermatozoa ml(-1)) than seawater O. mossambicus (4.6 x 10(9) spermatozoa ml(-1)). The mean osmolality of the urine of freshwater fish (78.5 mOsmol kg(-1)) was significantly different from that of seawater fish (304.8 mOsmol kg(-1)). The mean length of the mid-piece of the spermatozoa together with the tail was more variable in freshwater O. mossambicus (8.80 +/- 0.23 mu m) than in seawater specimens (8.27 +/- 0.18 mu m). Stripped sperm of freshwater O. mossambicus was highly contaminated by urine which was a good activator of sperm motility in O. mossambicus held in both fresh and sea water. The osmolality for initiation of motility in freshwater O, mossambicus spermatozoa was from 0 to 333 mOsmol kg(-1) while for seawater O. mossambicus spermatozoa it was from 0 to 1022 mOsmol kg(-1). The optimum osmolality for motility was from 70to 333 mOsmol kg(-1) for freshwater O mossambicus spermatozoa and from 333to 635 mOsmol kg(-1) for seawater fish. In freshwater O. mossambicus spermatozoa, the presence of 20 mM CaCl2 increased the permissive osmolality of NaCl from 184 to 635 mOsmol kg(-1). For seawater O. mossambicus spermatozoa, solutions of NaCl devoid of CaCl2 were unable initiate motility, but the addition of 1.5 to 30 mM CaCl2 to the NaCl solution (0 934 mOsmol kg(-1)) had a full motility initiating effect. (C) 1999 The Fisheries Society of theBritish Isles.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 16:22:32