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1 Oceanologia

1 1998

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Energy value of the mud crab Rhithropanopeus harrisii ssp. tridentatus (Crustacea, Decapoda) in relation to season, sex and size

Wiszniewska A., Rychter A., Szaniawska A.

Oceanologia

1998

No. 40 (3)

231-241

The energy value of male and female Rhithropanopeus harrisii tridentatus of various carapace width classes was determined. Crab samples were collected in the Vistula Lagoon from April to November 1995. The population of R. harrisii tridentatus from the Vistula Lagoon was characterised by a very low energy value 7.97 [SD] plus_min.1.5 J mg-1 DW, (12.69 [SD] plus_min. 2.1 J mg-1 AFDW). The average amount of ash in this population was 37.66% of dry weight (organic matter was 62.44%). In each month (except September) the calorific value of the females exceeded that of the males; this value also varied seasonally. The calorific value of the population dropped to a minimum in August, whereas the maximum level was recorded in September.