Parasites of Acipenser brevirostrum LeSueur and Acipenser oxyrhynchus Mitchill (Osteichthyes: Acipenseridae) in the Saint John River Estuary, N.B., with a description of Caballeronema pseudoargumentosus sp.n. (Nematoda: Spirurida)

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Abstract
Species of helminth and arthropod parasites (11) are reported from A. brevirostrum and A. oxyrhynchus in the St. John River estuary, N.B. [New Brunswick], Canada. Diclybothrium armatum, Spirorchis sp., Fessesentis friedi and Argulus alosa are new records from A. brevirostrum. Derogenes varicus, Truttaedacnitis sphaerocephala, Echinorhynchus gadi and Dichelesthium oblongum are new records from A. oxyrhynchus. Truttaedacnitis sphaerocephala and D. oblongum are new locality recrods for North America. Caballeronema pseudoargumentosus sp. nov. is described from A. brevirostrum and differs from the similar spirurid Ascarophis argumentosus in length of spicules (110-138 .mu.m and 492-598 .mu.m vs. 81-86 .mu.m and 320-340 .mu.m), egg length (38-44 .mu.m vs. 29-35 .mu.m) and number of egg filaments (4-10 vs. 2). Details of the oral structure of C. pseudoargumentosus are described and its relationship to Ascarophis and Capillospirura discussed. Parasite fauna of adult A. oxyrhynchus, juvenile A. oxyrhynchus and A. brevirostrum are distinct and reflect differing life histories and host ecologies.

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