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Aspects of the biology and pathogenicity of Diceratocephala
boschmai (Platyhelminthes: Temnocephalida), an ectosymbiont on the
redclaw crayfish, Cherax quadricarinatus
Jones, TC | Lester, RGJ
Australian journal of marine and freshwater research. Melbourne
[AUST. J. MAR. FRESHWAT. RES.]. Vol. 44, no. 6, pp. 927-933. 1993.
In commercial ponds, numbers of Diceratocephala boschmai, a
temnocephalid ectocommensal on the crayfish Cherax
quadricarinatus, were lowest in spring (October-December) and
highest in autumn (April). Worm numbers on host crayfish increased
over the summer breeding period (December-April) when moulting
stopped and decreased during the winter (April-October) when hosts
were moulting. The number of worms correlated positively with host
size. D. boschmai showed low host specificity in the laboratory.
Worms developed and deposited eggs on five different species of
Cherax (C. cuspidatus, C. depressus, C. destructor, C. tenuimanus
and C. quadricarinatus). Worms did not survive on the shrimp
Macrobrachium spp. because of the grooming habits of these hosts.
The health of crayfish was not significantly affected by
infestations with D. boschmai. Worms were not found in the
branchial chamber and so were not associated with respiratory
distress. They ate damaged crayfish eggs but did not attack
healthy eggs.
 Descriptors: Article Subject Terms commensals | crayfish culture | population number | seasonal variations | specificity | symbionts | Article Taxonomic Terms Cherax
quadricarinatus | Diceratocephala boschmai | Article Geographic Terms Australia,
Queensland
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