%0 Journal Article
%T Population dynamics of Piscicola Geometra (Hirudinea:Rhynchobdellida) on Oreochromis Niloticus (Cichlidae) cultured in a rainforest fish pond, South Eastern Nigeria
%A Opara
%A KN
%A <br>Opar
%A K. N.
%J 环境科学学报(英文版)
%D 2002
%I 
%X The distribution, abundance and intensity of the annelid worm, Piscicola geometra (leeches) infecting Oreochromis niloticus cultured in a rainforest fish pond, South Eastern Nigeria was studied over a 12 months period. Three hundred fish were examined of which 48.3% were infected. Infection occurred throughout the year, with a peak in February. Female fish had a significantly higher intensity of infection( P < 0.05) than males. There was a clear seasonal periodicity in the degree of infection and the distribution of the parasite exhibited an aggregated or contagious model of dispersion. There was a significant positive correlation between the size of the fish and worm burden.
%K Piscicola geometra
%K pond
%K Oreochromis niloticus
%K population dynamics
%K parasites<br>尼日利亚
%K 水蛭
%K 水体污染
%K 鱼塘
%K 生物毒性
%K 寄生虫
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=6CB1530875F53489BF1E81BD87B7F5E6&aid=25BBA2CBB805A507A6D244F95D7A19EB&yid=C3ACC247184A22C1&vid=F3583C8E78166B9E&iid=E158A972A605785F&sid=323E8A365B085E0B&eid=DFBC046213B3DD86&journal_id=1001-0742&journal_name=Journalofenvironmentalsciences(China)&referenced_num=0&reference_num=26