Redant, F.

Open Marine Archive

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CRUSTACEA
(F Redant)
Crangon crangon
Biannual sampling (in spring and autumn) of the brown shrimp stock and i15
predators off the Belgian coast was continued in 1984 to obtain a continuous set of
estimates on egg production, recruitment, production and mortality.
The investigations on long term population dynamics of the shrimp stock and on
competitive and predatory interactions with other epibenthic and demersal species
were also continued. Within this framework a study on the food composition of Gobiid
fishes was started. Preliminary results, referring to the early summer months, showed
that only 5% of the Pomatoschistus minutus and 0% of the P. lozanoi stomachs
contained shrimp remains. - ---
Finally are-evaluation of the evidence on the sex change and growth ofthe
brown shrimp, complemented with histological investigations on male and female
shrimps, was started.
Nephrops norvegicus
The sampling of commercial Norway lobster landings was continued in order to
monitor possible long term changes in the catch composition and the exploitation
pattern of the Nephrops stock in the Central North Sea (Botney Gut - Silver Pit areal.
A study on seasonal variations in landings, effort, CPUE, length composition and
sex-ratio of the catches was started. Possible explanations of these variations, in
relation to growth and reproductive cycle, are being investigated.


Crustacea. Belgium

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