Incidence and intensity of Spirocamallanus pereirai (Nematoda: Camallanidae) infestations in the croaker, Micropogon undulatus (Linneaus) and spot, Leiostomus xanthurus Lacepede, from Texas.
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From September 1970 to August 1971 the nematode Spirocamallanus pereirai was found in the digestive tracts of 266 of 516 (51.5%) croaker, Micropogon undulatus (Linnaeus), and 172 of 512 (33.6%) spot, Leiostomus xanthurus Lacepede. Spirocamallanus pereirai females predominated over males by a ratio ranging from approximately 6:1 to 1.8:1 in every monthly sample of both host species. Seasonal patterns in incidence and mean number of S. pereirai per host for both host species were evident. The incidence of parasitization by S. pereirai declined as the length of croaker and spot increased. The mean number of S. pereirai per croaker was variable when related to host length, but increased in spot hosts up to 179 mm in length.