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A drop-trap investigation of the abundance of fish in very shallow water in the Askö area, northern Baltic Proper
Aneer, G.; Nellbring, S. (1977). A drop-trap investigation of the abundance of fish in very shallow water in the Askö area, northern Baltic Proper, in: Keegan, B.F. et al. (Ed.) Biology of Benthic Organisms: 11th European Symposium on Marine Biology, Galway, October 1976. pp. 21-30
In: Keegan, B.F. et al. (Ed.) (1977). Biology of Benthic Organisms: 11th European Symposium on Marine Biology, Galway, October 1976. Pergamon Press: Oxford. ISBN 0-08-021378-2. XXXIII, 630 pp., more

Available in Authors 
    VLIZ: Proceedings [25759]
Document type: Conference paper

Keywords
    Population number; Shallow water; Pomatoschistus minutus (Pallas, 1770) [WoRMS]; Scardinius erythrophthalmus (Linnaeus, 1758) [WoRMS]; ANE, Baltic, Baltic Proper [Marine Regions]; Marine

Authors  Top 
  • Aneer, G.
  • Nellbring, S.

Abstract
    An investigation of the abundance of fish in very shallow water in the northern Baltic proper was started in July 1975 and terminated in August 1976. Drop traps enclosing a bottom area of 1 m² and the water column above have been used down to a depth of 0.5 m. Out of 83 drops only six were completely without any trapped fish. 16 species were caught but only a few of these occurred frequently. On average, the total abundance was 15.7 fish.m-2 with a mean biomass of 4.3 g.m-2 (2.98.m-2 if a school of rudd is excluded). The sand goby (Pomatoschistus minutus Pallas) dominated and was caught in 61 % of the drops. Its mean abundance was 4.9 fish.m-2 and the corresponding biomass 0.9 g.m-2. A school of rudd (Scardinius erythrophthalmus L.) caught in one drop affected the mean biomass value considerably and the mean for rudd was 39 % of the total although this species was present in two drops only. Shannon-Weaver indices for abundance and biomass have been calculated and both averaged 0.47.

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