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A habitat suitability index model for suspended tray culture of the Pacific oyster, Crassostrea gigas Thunberg (1988)

BROWN, J. R. ; HARTWICK, E. B.

Oxford, UK : Blackwell Publishing Ltd

Aquaculture research 19 (1988), S. 0

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ISSN: 1365-2109

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract. A habitat suitability index (HSI) model for suspended tray culture of the Pacific oyster, Crassostrea gigas Thunberg, was constructed from existing information in the literature on oyster-environment relationships. In the model, biophysical data are used to rate aquaculture potential of coastal areas on a scale from 0.0 to 1·0. where 1·0 represents optimal conditions for growth and survival and 0·0 represents totally unsuitable habitat conditions. The model was tested with environmental, growth (increase in shell height) and secondary production (g· 100 oysters−1 day−1) data collected over a 14-month period for two age-classes of oysters transplanted to 10 locations along the coast of British Columbia. Canada. Regressions of HSI values calculated from entire study environmental data against oyster growth and secondary production were highly significant for both age-classes. Environmental data subsets representing short sampling programmers (1–3 months) resulted in HSI values significantly correlated to oyster growth, provided that some sampling occurred during periods of high food availability. HSI modeling techniques have potential application in site selection and coastal management of aquaculture.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-2109.1988.tb00414.x

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Dynamics of shallow-water populations of Octopus dofleini (1984)

Hartwick, E. B. ; Ambrose, R. F. ; Robinson, S. M. C.

Springer

Marine biology 82 (1984), S. 65-72

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ISSN: 1432-1793

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Octopus dofleini (Walker) is a common inhabitant of shallow subtidal communities in the Northeast Pacific. The abundances of octopuses at two sites monitored since 1977 have fluctuated greatly during this period. The populations reached high abundances in mid-summer and, during some years, mid-winter. The highest abundances at the two sites did not coincide. There was a constant influx of new octopuses into both study sites, with the greatest immigration occurring in early summer. The octopuses captured spanned a wide range of weights every month, with no clear size classes or seasonal trends in size. The weights of newly-captured octopuses, however, did differ between the sexes and seasons: males weighed more on the average than females, and male weight decreased from winter to fall while female weights did not change O. dofleini appeared to recruit throughout the year; the smallest octopuses occurred between May and November and the greatest number of small octopuses was found in July and August in most years. Females predominated at both study sites throughout the year. However, males predominated among octopuses caught in traps at nearby locations, suggesting that the skewed sex ratios were due to behavioral differences between the sexes.