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Settlement of larvae of the giant scallop, Placopecten magellanicus, in 9-m deep mesocosms as a function of temperature stratification, depth, food, and substratum

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Abstract

In January and February 1992 an experiment was conducted in a 10.5-m deep tank (diameter: 3.7 m, volume: 117 m3) to examine the effects of food distribution with respect to a stable thermocline, depth, and substratum type on the settlement and metamorphosis of larvae of the giant scallop, Placopecten magellanicus (Gmelin). Polyethylene tube bags (diameter: 0.60 m) were used to enclose 9-m deep columns of seawater which were then used as treatment replicates. A sharp thermocline (i.e. 7 to 11°C gradient) was created between a depth of 4.0 and 5.0 m. At the beginning of the experiment, one million 6-d old larvae were added to the surface of each tube. Two or three replicate tubes of each of four feeding treatments were established: (1) food (Isochrysis galbana) added to the top 1 m of the water column (“top-fed”, n=3); (2) food added to the bottom 1 m of the water column (“bottom-fed”, n=3); (3) food added throughout the water column (“mixed”, n=3); and (4) no food added (“unfed”, n=2). Settlement collectors were placed in two replicate tubes of each treatment at depths of 0.1, 4, 5, and 9 m and contained two different substrata, Polysiphonia lanosa (a red filamentous alga) and aquarium filter-wool as an algal mimic. Spat settlement in the different feeding treatments was a function of larval growth rate. Most spat were collected in the mixed tubes. Fewer individuals were collected in the top-fed treatment and fewer still in the bottom-fed treatment; minimal numbers of spat were found in the unfed tubes. Filter-wool collected more spat than P. lanosa, but this was evident only in the 4-m deep collectors in the mixed tubes. Most spat were found in the 0.1-m or 4-m deep collectors; generally few were located below the thermocline in collectors at 5 or 9 m. We suggest that, in areas of intense stable stratification, spat collection of the giant scallop may be enhanced by the placement of collectors with appropriate substratum material at or above the zone of stratification, rather than near the bottom. Furthermore, we propose that natural settlement may be increased in areas where a stratification layer intersects with the sea floor or where the layer is disrupted by turbulent mixing.

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Author notes

  1. C. M. Pearce

    Present address: Department of Biology, Dalhousie University, B3H 4J1, Halifax, Nova Scotia, Canada

Authors and Affiliations

  1. GIROO, Département de Biologie, Université Laval, G1K 7P4, Sainte-Foy, Québec, Canada

    C. M. Pearce & E. Bourget

  2. Department of Biology, Dalhousie University, B3H 4J1, Halifax, Nova Scotia, Canada

    J. L. Manuel, D. A. Manning & R. K. O'Dor

  3. Department of Biology, Woods Hole Oceanographic Institution, 02543, Woods Hole, Massachusetts, USA

    S. M. Gallager

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  1. C. M. Pearce
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  3. J. L. Manuel
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  4. D. A. Manning
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  5. R. K. O'Dor
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Communicated by J. P. Grassle, New Brunswick

Contribution to the programs of OPEN (Ocean Production Enhancement Network, one of the 15 Networks of Centres of Excellence supported by the Government of Canada) and GIROQ (Group Interuniversitaire de Recherches Océanographiques du Québec)

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Pearce, C.M., Gallager, S.M., Manuel, J.L. et al. Settlement of larvae of the giant scallop, Placopecten magellanicus, in 9-m deep mesocosms as a function of temperature stratification, depth, food, and substratum. Marine Biology 124, 693–706 (1996). https://doi.org/10.1007/BF00351050

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