Additional morphological information on two species of Caligus (Copepoda: Caligidae) parasitic on South African marine and estuarine fish

Two species of Caligus that are parasitic on fish were collected from Lake St Lucia, South Africa. Specimens of C. confusus Pillai, 1961, were removed from the gill chambers of both Caranx sexfasciatus Quoy & Gaimard, 1825, and Rhabdosargus holubi (Steindachner, 1881), and Caligus acanthopagri Lin, Ho & Chen, 1994, from the skin of both Acanthopagrus berda (Forsskål, 1775) and R. holubi. Except for the occurrence of Caligus confusus on Caranx sexfasciatus, all of the remaining host records are new in South Africa. Caligus acanthopagri is recorded for the first time from South African waters. The morphological features of these two species were studied with scanning electron microscopy. Patterns were observed on the dorsal side of the cephalothorax of the male C. confusus. Such patterns have not previously been observed. The fine structures on the exopod of leg 4 of both species were studied, as these features are important for distinguishing species.Key words: Crustacea, Caligus confusus, C. acanthopagri, external morphology, SEM

A survey of coccidian infection of freshwater fishes in South Africa, with the description of Goussia anopli n. sp. (Apicomplexa: Eimeriidae)

Seventy-seven specimens of seven freshwater fish species harvested in four sites from rivers and ponds of the Gauteng, North West and Limpopo Provinces ( South Africa) were surveyed for coccidian infections. Two fish species were infected with apicomplexans belonging to Goussia Labbe, 1896. In banded tilapia Tilapia sparrmanii Smith unsporulated oocysts of G. vanasi (Landsberg & Paperna, 1987) were found which became sporulated in tap-water within 24 hours. Another species in the gut of chubbyhead barb Barbus anoplus Weber harboured sporulated oocysts in the faeces and in the intestinal epithelium. The latter species has been described as G. anopli n. sp