Abstract
<p>The experiment was done to find out species, intensity and prevalence of common crap fry from traditional ponds and "longyam" at Sukamulya village, Singaparna, Tasikmalaya. This experiment was conducted at Sukamulya village and Aquatic Biology Laboratory of Fisheries Department, Faculty of Agriculture, Padjajaran University form October 1<sup>st</sup> 2002 to October 31<sup>th</sup> 2002. Samples of common carp fry were obtained from six traditional ponds and six "longyam". The survey method was used in this experiment of common carp fry at difference type of pond were based on the Wilcoxon rank sum test. Intensity and prevalence of ectoparasites of common carp fry at traditional ponds and longyam was based on the Kruskal-Wallis test. The result of this experiment showed that eight genera of ectoparasites were found, consisted of three Platyhelminthes: <em>Dactylogyrus </em>(47,01%), <em>Gryrodactylus </em>(3,84%), <em>Transversotrema</em> (0,01%), four Protozoa: <em>Ichtyophthrius</em> (9,59%), <em>Epistylis</em> (1,05%), <em>Trichodina</em> (1,68%) and one Arthopoda: Acarus (0,01%), The intensity of Dactylogyrus was 28,83. Gryrodactylus 4.98, <em>Transversotrema</em> 0,17, <em>Ichthyophthirius</em> 13,51, <em>Epistylis</em> 4,68, <em>Trichodina</em> 25,14 <em>Trichodinella</em> 6,55 and <em>Acarus</em> 0,17. The prevalence of <em>Dactylogyrus</em> is 90,00% <em>Gyrodactylus</em> 44,82%, <em>Transversotrema</em> 0,37%, <em>Ichthyophthirius</em> 42,17, <em>Epistylis</em> 13,17%, <em>Trichodina</em> 82,59%, <em>Trichodinella</em> 17,04 and <em>Acarus</em> 0,37%.</p> <p>Key words: Intensity, prevalence, ectoparasites, common carp fry, traditional pond, "longyam"</p>
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