In my literature data base I have found some additional references
which might be of interest in this context.


<fontfamily><param>Anonymous</param>JANSSON, B.-O.; ANEER, G.;
NELLBRING, S.; 1985: Spatial and temporal distribution of the demersal
fish fauna in a Baltic archipelago as estimated by SCUBA census. Mar.
Ecol. Prog. Ser. 23, 31-43.</fontfamily>


<fontfamily><param>Anonymous</param>Abstract: A quantitative
investigation of the demersal fish fauna of a 160 km super(2)
archipelago area in the northen Baltic proper was carried out by scuba
census technique. Thirty-four stations covering seaweed areas, shallow
soft bottoms with seagrass and pond weeds, and deeper, naked soft
bottoms down to a depth of 21 m were visited at all seasons. The
results are compared with those obtained by traditional gill-net
fishing.</fontfamily>

<fontfamily><param>Anonymous</param>

HANSSON, S.; RUDSTAM, L.G.; 1995: Gillnet catches as an estimate of
fish abundance: a comparison between vertical gillnet catches and
hydroacoustic abundances of Baltic Sea herring (Clupea harengus) and
sprat (Sprattus sprattus). Can. J. Fish. Aquat. Sci. 52,
75-83.</fontfamily>


Citation: <fontfamily><param>Anonymous</param>Fish abundance determined
by hydroacoustics was significantly correlated with gillnet catches but
explained only 28% of the variance in catch per unit effort corrected
for gillnet selectivity and fish swimming speed. Visibility (measured
as Secchi disk depth) significantly decreased the likelyhood of fish
being caught in gill nets, while the effect of temperature was positive
but nonsignificant.</fontfamily>


<fontfamily><param>Anonymous</param>ARENA, G.; BAREA, L.; DEFEO, O.;
1994: Theoretical evaluation of trap capture for stock assessment.
Fish. Res. 19, 349-362.</fontfamily>


Best wishes, Helmut


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Dr. Helmut Thetmeyer                                 Tel. +49-431
597-3913

Institut fuer Meereskunde Kiel                       Fax  +49-431
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Abteilung Fischereibiologie

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