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Rotifer Biology and Strains

Rotifer Biology and Strains. Systematics. Phylum: Nemahelminthes eller Aschelminthes Class: Rotifera (lat. Hjulbærer) Order: Monogononta Familiy: Branchionidae 90% are freshwater species. Morphology.

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Rotifer Biology and Strains

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  1. Rotifer Biology and Strains Live food aquaculture training course www.aquatrain.org

  2. Systematics • Phylum: Nemahelminthes eller Aschelminthes • Class: Rotifera (lat. Hjulbærer) • Order: Monogononta • Familiy: Branchionidae • 90% are freshwater species Live food aquaculture training course www.aquatrain.org

  3. Morphology • Corona: movements and generation of water currencts for ingestion of feedparticles up to 30 m • Mastax: crushes the ingested particles • Stomach with glands • Unpaired gonads • Primitive excretion system and bladder • Pseudocoelom: function as a hydrostatic skeleton and cardiovascular system • Common opening for bladder and uterus; cloaca • Foot: the pedal has glands tha secreets glue for fastening to the susbstrate Live food aquaculture training course www.aquatrain.org

  4. Life cycle I • Optimal environmental conditions • Amictic females produce genetic idendical offspring from diploid eggs • Usually one egg/female is observed • Suboptimal environmental conditions (mixis stimulus) • Mictoc female produce mictic (haploid eggs) from which males hatch • Resting eggs are produced after fertilization of the mictic egg • Hatching is initiated after stimulus (e.g temperature/salinity changes) Resting egg with amictic females Resting egg Live food aquaculture training course www.aquatrain.org

  5. Temperature and reproduction Effect of temperature on the reproduction activity of Brachionus plicatilis. (After Ruttner-Kolisko, 1972). Live food aquaculture training course www.aquatrain.org

  6. Population dynamics • Specific growth rate: u = (lnN2 – lnN1)/t • Instant production : P = N • Relation between growthrate () and eggfrequency (ER):  = ER – 0,2 • Expected production the next day: P = N(ER – 0,2) Live food aquaculture training course www.aquatrain.org

  7. Strain recognition • SS-type • S-type: lorica shows pointed spines • L-type lorica shows obtuse angled spines SS Live food aquaculture training course www.aquatrain.org

  8. Rotifer strain information Live food aquaculture training course www.aquatrain.org

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