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(Nematoda: Anisakidae) in Fish-Eating Birds from Zimbabwe

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(Nematoda: Anisakidae) in Fish-Eating Birds from Zimbabwe Article — Artikel First record of Contracaecum spp. (Nematoda: Anisakidae) in fish-eating birds from Zimbabwe M Barsona* and B E Marshalla 2002), of which the reed cormorant Phalacrocorax africanus (Gmelin, 1789), the ABSTRACT white-breasted cormorant P.carbo (L.), the Endoparasites of fish-eating birds, Phalacrocorax africanus, P.carbo, Anhinga melanogaster and darter Anhinga melanogaster Lacapéde & Ardea cinerea collected from Lake Chivero near Harare, Zimbabwe, were investigated. Adult Dauchin, 1802, and the grey heron Ardea Contracaecum spp. were found in the gastrointestinal tract (prevalence 100 % in P.africanus, P. carbo and A. melanogaster;25%inA. cinerea). Parasite intensity was 11–24 (mean 19) in cinerea (L.), were selected because of their P. africanus, 4–10 (mean 7) in P. carbo, 4–56 (mean 30) in A. melanogaster and 2 (mean 0.5) in abundance on the lake. A. cinerea. The cormorants fed mainly on cichlid fishes and carp; the darters and the grey herons on cichlids. All these fishes are intermediate hosts of Contracaecum spp. Scanning MATERIALS AND METHODS electron microscopy revealed that Contracaecum rudolphii infected both cormorant species Four reed cormorants, 4 white-breasted and darters; C. carlislei infected only the cormorants while C. tricuspis and C. microcephalum cormorants, four darters and four grey infected only the darters. Parasites from the grey heron were not identified to species herons were shot with a 0.22 rifle and a because they were still developing larvae. These parasites are recorded in Zimbabwe for the 12-bore shotgun firing buckshot at Lake first time. Chivero. Their beaks were sealed with Key words: Contracaecum, Lake Chivero, mean intensity, nematode, parasite prevalence, rubber bands to prevent the escape of piscivorous bird, Zimbabwe. parasites lodged in the buccal cavity. In the laboratory, the birds were weighed, Barson M, Marshall B E First record of Contracaecum spp. (Nematoda: Anisakidae) in fish-eating birds from Zimbabwe. Journal of the South African Veterinary Association (2004) dissected, and the alimentary canal was 75(2): 74–78 (En.). Department of Biological Sciences, University of Zimbabwe, PO Box opened. Undigested and partly digested MP 167, Mount Pleasant, Harare, Zimbabwe. fish encountered in the oesophagus and stomach were removed, identified to species level where possible, and weighed. Nematodes either found in the INTRODUCTION diplostomid trematodes to cestodes and oesophagus or attached to the stomach Fish-eating birds are abundant in fresh- nematodes. The anisakid nematode, mucosa were removed, fixed in glacial water habitats in Zimbabwe as they are in Contracaecum sp., is one of the most preva- acetic acid and stored in 70 % ethyl most parts of Africa and the world over13. lent parasites in southern African pisci- alcohol. Sub-samples of nematodes from With the increase in man-made impound- vorous birds, infecting 5 avian species20,21. each infected bird were set aside for ments in the country, many of the bird Some of the Contracaecum species are electron microscopy. The remainder was species have adapted to breeding in these widely distributed in other parts of Africa, cleared and mounted in lactophenol and habitats13,14, which also provide a more Europe, Asia, Australasia, North and the cover slides were sealed with clear abundant source of fish than flowing South America3,27. It is partly for this rea- nail varnish. waters6,9. Although the ecology of the son that the occurrence of Contracaecum Specimens for scanning electron mi- birds has been studied to some extent in spp. was investigated in 4 piscivorous croscopy (SEM) were cleaned in an ultra- Zimbabwe’s major dams9,11,12,14, little is bird species at Lake Chivero, Zimbabwe. sonic cleaner (Branson 3200) to remove documented on their parasitic diseases. This study aimed to specifically identify debris from the cuticle. They were dehy- These include 1 paper by Beverly-Burton5 the Contracaecum species, the adults of drated in an ascending series of ethyl on Diplostomum mashonense, a trematode which are only found in the bird defini- alcohol (70 %, 80 %, 90 %, industrial from the grey heron and a Government tive host and the larvae of which had been methanol and 100 %) after which they Veterinary Laboratory record of the found in some fish from the lake4 and to were critical-point dried. They were nematode Spiroptera sp. in 2 cormorants compare them with those from South mounted on stubs and gold-coated for 40 found dead on Lake Chivero in 1995 African birds to establish their regional minutes and then examined and photo- (T Couto, Department of National Parks distribution. graphed under a JEOL 6100 scanning and Wildlife Management, Zimbabwe, Lake Chivero lies 37 km southwest of electron microscope between 5–7 kV.Keys pers. comm., 2002). Harare, the capital of Zimbabwe. It is the by Anderson3, Hartwich10 and Yamaguti27 Elsewhere in Africa, the occurrence of city’s potable water reservoir and is very were used for identification. parasites in aquatic birds has been deter- eutrophic because of sewage and indus- mined in Ghana23 and South Africa20,21,26, trial effluent that is discharged into its RESULTS and they range from clinostomid and feeder streams from Harare and its neigh- All the cormorants and darters were bouring town, Chitungwiza17. The lake infected with at least 4 nematodes in their aDepartment of Biological Sciences, University of Zimbabwe, PO Box MP 167, Mount Pleasant, Harare, supports a large fish community and alimentary canal (prevalence 100 %) Zimbabwe. about 12 bird species (T Couto, Depart- while only 1 grey heron (25 %) was *Author for correspondence. E-mail: [email protected] ment of National Parks and Wildlife infected (Table 1). The parasite intensity Received: October 2003. Accepted: March 2004. Management, Zimbabwe, pers. comm., was greatest in the darter compared the 74 0038-2809 Tydskr.S.Afr.vet.Ver. (2004) 75(2): 74–78 Table 1: The infection statistics of Contracaecum species found in the alimentary canal of four species of piscivorous birds at Lake Chivero. Bird species Host Host weight Parasites in Parasites in Intensity MI* P (%)* sex (g) oesophagus stomach (per species) (per species) Phalacrocorax africanus F 518 8 16 24 18.75 100 F55102222 M55201111 M61921618 Phalacrocorax carbo F 2065 3 1 4 6.50 100 M 2525 3 7 10 M 2200 4 0 4 M 2225 0 8 8 Anhinga melanogaster F 1265 0 4 4 30.00 100 F 1375 11 31 42 F 1590 3 53 56 M 1205 1 17 18 Ardea cinerea F 1775 0 0 0 0.50 25 F 1635 0 0 0 F 1260 1 1 2 M 1430 0 0 0 *MI = mean intensity, P = prevalence. abc Fig. 1: a, Head of a female Contracaecum rudolphii from a reed cormorant (scale bar = 10 µm); b, tail of a male C. rudolphii from a white-breasted cormorant showing the arrangement of postcloacal papillae (scale bar = 10 µm); c, tail of a male C. rudolphii showing the spicules (fused), papillae and caudal alae (scale bar = 100 µm). reed cormorant, the white-breasted cor- with marked medial deepening. Lip palp with longitudinal alae (Fig. 3b). Host: A. morant and the grey heron. The nema- forming 2 lobes in interior margin melanogaster. todes were 11–29 mm long (mean 17 mm) (Fig. 1a). Males with 25–44 pairs of pre- and the majority (73 %) were male. The cloacal papillae arranged irregularly in 2 Contracaecum tricuspis (Fig. 4) Zambezi bream, Pharyngochromis acuticeps longitudinal rows and 6–7 pairs of post- Three lips with lateral surfaces notched (Staindachner), and the Nile bream, cloacal papillae (Fig. 1b). Spicules similar with a point, into which interlabia fit. Oreochromis niloticus (L.), constituted the and subequal (Fig. 1c). Hosts: P. africanus, Dorsal lip with 2 simple papillae; latero- most abundant species in the diet of the P. carbo and A. melanogaster. ventral lips each with 1 double papilla. birds (Table 2). The darters and herons Three interlabia each with a slender preferred O. niloticus while the cormo- Contracaecum carlislei (Fig. 2) corpus ending in 3 tips (Fig. 4a). No rants were not very specific. Three rectangular lips with bilobed lateral alae present. Males with 55–78 Four species of adult Contracaecum anterior surfaces. Large curved inter- Raillet and Henry, 1912 were identified: labia. Dorsal lip with 2 single papillae and C. rudolphii Hartwich, 1964, C. carlislei Ort- subventral lips with a double and a single lepp, 1938, C. microcephalum (Rudolphi, papilla. Males with 26–34 pairs of pre- 1809) and C. tricuspis (Gedoelst, 1916). cloacal papillae and 5 pairs of postcloacal Generic diagnosis using light microscopy papillae. Hosts: P. africanus and P. carbo. was based on the presence of the ventric- ular appendix and intestinal caecum as Contracaecum microcephalum well as length measurements, while SEM (Fig. 3) revealed the detailed structure of the Round hexagonal lips forming 2 lobes head and tail, the size and number of cau- anteriorly (Fig. 3a). Interlabia not bifur- dal papillae and spicules in males, which cated but distinctly rounded. Males with were used for species identification. 32 pairs of precloacal papillae in 2 longitu- dinal rows, 5 pairs of simple postcloacal papillae and 1 double pair of postcloacal Fig. 2: Head of Contracaecum carlislei from Contracaecum rudolphii (Fig. 1) a white-breasted cormorant. Scale bar = Lips slightly wider than long; upper lip papillae. Spicules similar and subequal, 100 µm. 0038-2809 Jl S.Afr.vet.Ass. (2004) 75(2): 74–78 75 Table 2: The diet of 4 bird species collected from Lake Chivero. Bird species Sex Mass of gut contents Fish sp. No. of fish Mass of fish Mean mass of fish (g) in diet* of each sp. in diet (g)* in diet (g) Phalacrocorax africanus FND Pa 2NDND F41On 7 29 4.14 uc 1 3 3.00 MNDuc16NDND MND On 5NDND Phalacrocorax carbo F85On 5 37 7.40 uc 2 5 2.50 Pa 1 7 7.00 MND Pa 4NDND M56 On 3 15 5.00 Cc 1 5 5.00 Pa 2 15 7.50 uc 1 4 4.00 M119 On 1 48 48.00 Pa 2 8 4.00 uc 2 10 5.00 Anhinga melanogaster F 147 On 5NDND FND On 2NDND FND On 7 127 18.14 uc 1 5 5.00 M71 On 6 56 9.33 Ardea cinerea FNDuc16NDND F114 On 2 109 54.5 FND On 1 8 8.00 MND–0NDND *Pa = Pharyngochromis acuticeps, On = Oreochromis niloticus, Cc = Cyprinus carpio, uc = unidentified cichlids, ND = not determined.
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