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The location of spawning grounds, spawning and schooling behaviour of the squid Loligo vulgaris reynaudii (Cephalopoda: Myopsida) off the Eastern Cape Coast, South Africa

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Abstract

The location of spawning grounds of the squid Loligo vulgaris reynaudii (D'Orbigny) was investigated in the years 1988–1990. At least 39 spawning sites were found during this period along the inshore areas of the Eastern Cape coastline between Algoa Bay and Plettenberg Bay. The substrate chosen for egg laying was mostly fine sand or flat reef, frequently in large and relatively shettered bays. Spawning was found to occur sporadically throughout the year, and some spawning sites were used repeatedly within a particular year and in subsequent years. Squid migrate in discrete schools separated by sex in the vicinity of the spawning sites; these schools mix during spawning. Mating and egg deposition behaviour is described from observations made on the spawning grounds. Cannibalism was seen on a number of occasions, but no post-spawning mortality was recorded. Egg beds consisted mostly of large concentrations of egg strands (>3 m in diameter), with smaller aggregations of one to ten egg strands surrounding these, with single strands in the immediate vicinity. Three basic patterns of echotraces were identified and interpreted according to diving observations. These patterns were classified as loose patches, dense patches, and complex patterns. The first two represent non-spawning schooling patterns and the third, mating and egg laying behaviour. This observation led to the general classification of squid aggregations: schools (non-spawning mode) and concentrations (spawning mode). Concentrations as far as Loligo vulgaris reynaudii was concerned were further divided into two patterns: suprabenthic and benthic (spawning) squid.

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Author notes

  1. M. R. Lipinski

    Present address: Sea Fisheries Research Institute, Private Bag X2, 8012, Roggebaai, South Africa

Authors and Affiliations

  1. Port Elizabeth Museum, Humewood, P.O. Box 13147, Port Elizabeth, South Africa

    W. H. H. Sauer & M. J. Smale

  2. Marine Biology Research Institute, University of Cape Town, 7700, Rondebosch, South Africa

    M. R. Lipinski

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  1. W. H. H. Sauer
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  2. M. J. Smale
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  3. M. R. Lipinski
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Communicated by O. Kinne, Oldendorf/Luhe

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Sauer, W.H.H., Smale, M.J. & Lipinski, M.R. The location of spawning grounds, spawning and schooling behaviour of the squid Loligo vulgaris reynaudii (Cephalopoda: Myopsida) off the Eastern Cape Coast, South Africa. Marine Biology 114, 97–107 (1992). https://doi.org/10.1007/BF00350859

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