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Titolo:
EFFECTS OF TEMPERATURE ON MORPHOLOGICAL LANDMARKS CRITICAL TO GROWTH AND SURVIVAL IN LARVAL ATLANTIC COD (GADUS-MORHUA)
Autore:
VONHERBING IH; BOUTILIER RG; MIYAKE T; HALL BK;
Indirizzi:
DALHOUSIE UNIV,DEPT BIOL HALIFAX NS B3H 4J1 CANADA DEPT ZOOL CAMBRIDGE CB2 3E5 ENGLAND
Titolo Testata:
Marine Biology
fascicolo: 4, volume: 124, anno: 1996,
pagine: 593 - 606
SICI:
0025-3162(1996)124:4<593:EOTOML>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
HADDOCK MELANOGRAMMUS-AEGLEFINUS; YOLK-SAC LARVAE; HALIBUT HIPPOGLOSSUS-HIPPOGLOSSUS; HERRING CLUPEA-HARENGUS; NORTHERN ANCHOVY; ENGRAULIS-MORDAX; GEORGES-BANK; VINCIGUERRIA PHOTICHTHYIDAE; OXYGEN-UPTAKE; FISHES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
66
Recensione:
Indirizzi per estratti:
Citazione:
I.H. Vonherbing et al., "EFFECTS OF TEMPERATURE ON MORPHOLOGICAL LANDMARKS CRITICAL TO GROWTH AND SURVIVAL IN LARVAL ATLANTIC COD (GADUS-MORHUA)", Marine Biology, 124(4), 1996, pp. 593-606

Abstract

The morphology and function of structures important to energy acquisition were studied from spawning to the stage of transformation of larva to pelagic juvenile in Atlantic cod, Gadus morhua L., from December 1991 to July 1992. Fertilized eggs produced by adult fish from two genetically discrete populations (Newfoundland and Scotian Shelf) were raised under similar conditions in the laboratory at temperatures of 5 and 10 degrees C. Subsamples of larvae were removed from cultures dailyfor 10 d, and then less frequently, and fixed for light microscopy and scanning electron microscopy. Nine functional morphological ''landmarks'' important to feeding, respiration and locomotion were chosen from observation of 280 ind. These landmarks defined 12 major developmental stages, from hatching to the pelagic juvenile stage. One of the feeding landmarks, intestinal stage, varied as a function of age and sizeand the variance in development was higher at 10 degrees C than at 5 degrees C; Newfoundland larvae developed more complex intestines than did Scotian Shelf larvae. In addition, Newfoundland larvae had significantly higher growth rates than those of Scotian Shelf larvae. Despitethe higher growth rates and greater structural complexity of the intestine in Newfoundland larvae, the rate of yolk utilization was not significantly different between Newfoundland and Scotian Shelf larvae. Staging of respiratory landmarks showed that the gill arches were probably used preferentially in feeding while respiration was cutaneous. Thegills, operculum and gill rakers developed late in larval life and accompanied the transition from cutaneous to branchial respiration. In the yolk-sac period, development of feeding and respiratory structures may be largely genetically controlled. During exogenous feeding, extrinsic factors also become important, as shown by the size and age-independent variation in intestinal development of larval cod raised at different temperatures.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 08:53:30