World Congress of Malacology Antwerp ... - Unitas Malacologica

water malacofauna of the Azores, in 1975, dismissed ?H. evanescens and A. striatus from the
Azorean list, but added Helisoma trivolvis (Say), Lymnaea truncatula (Müller) and Lymnaea peregra
(Müller). Related to an outbreak of fasciolosis, a survey of the fresh-water molluscs was conducted in
S. Miguel and Terceira, in 1991, by one of the authors (AMFM). The present contribution extends the
distribution of Lymnaea truncatula to Santa Maria, Pisidium casertanum to Santa Maria and Flores,
and for the first time records Ferrissia clessiniana (Jickeli) from S. Miguel, Santa Maria, and
Graciosa.
Microalgae as feed for nursery phase cultivation in blue mussels (Mytilus edulis)
Raso, Sayam 1 ; Wijffels, R.H. 1 ; Smaal, A. C. 2
1. Food and Bioprocess Engineering group, Wageningen UR, Building no. 307,
Bomenweg 2, 6703 HD, Wageningen, The Netherlands,
Email: rene.wijffels@wur.nl; Sayam.raso@wur.nl
2. Wageningen IMARES, Yerseke, Koringaweg 5, 4401 NT, Yerseke, The
Netherlands,
Email: Aad.smaal@wur.nl
Microalgae as live feed play an important role to feed shellfish to fulfill nutritional requirements. The
aim of this research is to improve production of blue mussel (Mylilus edulis) by improving a process
design and technology for either microalgae or shellfish in terms of growth, filtration, clearance rate
and carbon metabolism. Different types of microalgae will be produced and then labeled with 13 C to
feed blue mussels at nursery phase. Then, Nuclear Magnetic Resonance was used to assess the
enrichment of feeding in terms of quality and metabolism. In such a way, the digestibility of different
microalgae can be analyzed. As a consequence, growth, filtration and clearance rate of each types of
microalgae can be revealed and knowing that adding the right composition of microalgae results in
development of nursery phase cultivation to improve the production.
Sessile snails, mobile genes: Mitochondrial gene dynamics within the worm-snail family
Vermetidae
Rawlings, Timothy A. 1 ; Collins, Timothy M. 2 ; Bieler, Rüdiger 3
1. Department of Biology, Cape Breton University, Nova Scotia B1P 6L2, Canada,
Email: Timothy_Rawlings@cbu.ca
2. Department of Biological Sciences, Florida International University,
Miami, FL 33199, USA,
Email: collinst@fiu.edu;
3. Department of Zoology (Invertebrates), Field Museum of Natural History
1400 S. Lake Shore Drive, Chicago, IL 60605-2496, USA,
Email: rbieler@fieldmuseum.org
The Phylum Mollusca is challenging our traditional view of highly conserved mitochondrial (mt)
gene orders within animal phyla. Representatives of three classes of molluscs share remarkably few
mt gene boundaries, with gene order varying extensively even within the Gastropoda. Here we
present further evidence of an unusually labile gastropod mitochondrial genome based on four
complete and three partial (> 7kb) mitochondrial genomes from members of one gastropod family,
the Vermetidae. Vermetids represent a clade of sessile, uncoiled, suspension-feeding gastropods that
radiated from a basal caenogastropod stock in the early Cenozoic. Demonstration of major gene order
changes within such a young taxonomic group is exciting for a number of reasons. First, vermetid mt
genomes are helping to understand more fully the mechanics of gene order changes, since the telltale
vestiges of gene duplications and translocations, typically erased or overwritten with time, are still
present within some of these genomes. Second, vermetid mt genomes are providing the opportunity
to study putative mechanisms accounting for gene order homoplasy and tRNA gene remolding at a
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