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  • Canadian Science Publishing  (2)
  • French  (2)
  • 1970-1974  (2)
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  • Canadian Science Publishing  (2)
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  • French  (2)
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  • 1970-1974  (2)
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  • 1
    Online Resource
    Online Resource
    Annual Biodeposition and Gross Energy Budget of Mature Pacific Oysters, Crassostrea gigas
    Canadian Science Publishing ; 1974
    In:  Journal of the Fisheries Research Board of Canada Vol. 31, No. 2 ( 1974-02-01), p. 185-190
    Details
    In: Journal of the Fisheries Research Board of Canada, Canadian Science Publishing, Vol. 31, No. 2 ( 1974-02-01), p. 185-190
    Abstract: The mean annual volume of seawater pumped by Pacific oysters in Departure Bay, British Columbia is 1488 liters/g per year. The energy requirement for metabolism and pumping is 1.74 cal/liter, while the mean annual caloric content of the seawater is 60.4 cals/liter. Annual biodeposition is 8.9 g/g per year; these data applied to a mean biomass of 190 g/m 2 for a mature oyster reef show that 22,052 kcal are theoretically available for ingestion, but only 11% are retained, mostly to be biodeposited. The biodeposits have a caloric value of 1545 kcal/m 2 and furnish an important nutritional substrate. Another important contribution to the food web is the annual release of gametes, equivalent to 502 kcal/m 2 reef.
    Type of Medium: Online Resource
    ISSN: 0015-296X
    URL: Article
    DOI: 10.1139/f74-030
    Language: French
    Publisher: Canadian Science Publishing
    Publication Date: 1974
    detail.hit.zdb_id: 3036-3
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Thermal Requirements for Maturation, Spawning, and Embryo Survival of the Brook Trout, Salvelinus fontinalis
    Canadian Science Publishing ; 1973
    In:  Journal of the Fisheries Research Board of Canada Vol. 30, No. 7 ( 1973-07-01), p. 975-984
    Details
    In: Journal of the Fisheries Research Board of Canada, Canadian Science Publishing, Vol. 30, No. 7 ( 1973-07-01), p. 975-984
    Abstract: Thermal requirements for brook trout reproduction were determined at a natural day-length cycle and five constant temperatures (10–21 C) and one treatment that followed the seasonal temperature regime of Lake Superior. The optimum range for growth (unrestricted rations) and relative condition factor was 10–19 C. Survival was 90% or greater and gonad growth and secondary sexual characteristics were well developed at all temperatures. The maximum temperature at which males became functionally mature and contained motile spermatozoa was 19 C. Ovulation and spawning occurred at 16 C and lower. Water temperature had little influence on time of spawning, but had a major influence on spawning activity and egg viability. The upper median effective temperature (ET50) for the number of viable eggs spawned per female was 11.7 C. The upper median tolerance limit (TL50) for normal hatch was 12.7 C; the optimum temperature was near 6 C. Major factors influencing the number of embryos surviving to hatch were spawning and incubation temperatures and age of the embryo when exposed to test temperatures. Thermal criteria that recognize seasonal changes in their thermal requirements are recommended for self-sustaining brook trout populations.
    Type of Medium: Online Resource
    ISSN: 0015-296X
    URL: Article
    DOI: 10.1139/f73-158
    Language: French
    Publisher: Canadian Science Publishing
    Publication Date: 1973
    detail.hit.zdb_id: 3036-3
    Location Call Number Limitation Availability
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    Online Resource
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