laevis are well known pathogens of flounder and other fish. D. spathaceum matacercariae infect the lens of fish, causing blindness and a subsequent inability to find food. P. laevis can cause mass invasions. The fish intestine shows gross lesions and other organs can be damaged too. A. anguillae have also been found in flounder before, but this thorn-headed worm infects mostly predatory fish. Tapeworm S. pungitii plerocercoid stage is common in stickleback (three-spined stickleback and nine-spined stickleback). The plerocercoid in flounder indicates that flounder might have ingested stickleback with parasite infestations 39 KASUTATUD KIRJANDUS Andryk, L.V. Life cycle of development of Acanthocephalus anguillae. 1979. Zoologicheskii zhurnal. 58(2), 168-174 Baer, J.G. Ecology of Animal Parasites. 1951. The University of Illinois Press, Illinois. Bauer, A., Trouvé, S., Grégoire, A., Bollache, L
red spines pink spines green spines green spines (ii) many AaBb and aabb; ref 1 : 1 ratio of these; ref linkage; ref parental types; few Aabb and aaBb; ref 1 : 1 ratio of these; ref recombinants; ref crossing over; many red and green spined; few / no, pink spined; 1 : 1 green : red / more green than red; ref proportions depend on how close, loci / genes, are; max 5 [15] 159. (a) 1 prevent, self-pollination / unwanted pollination, of flowers; 2 detail of prevention; 3 cross-pollinate two varieties; A crossed / mated / hybridised
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