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A new species Contracaecum malhi collected from catfish Wallago attu Bloch and Schneider, 1801 of Indus river of Sindh, Pakistan. Totally, 41 specimens of host were collected. The host specimens were dissected longitudinally, viscera put into petri dishes for examination of nematodes and were process through standard method of temporary slide. A new species, Contracaecum malhi, were identifed in having differential diagnostic characters such as body shape and size, shape of cephalic end and its structures, ventricular shape, spicule shape and size, numbers and arrangement of caudal papillae, posterior end with 3 rectal gland and large spine at tip, genital structure of female. The name of new species Contracaecum malhi refers to the name of host wallago attu from which the specimens of new species were collected.

New nematode species of genus Rhabdochona collected form host catfishes Rita rita of Indus River, Jamshoro, Sindh, Pakistan. Collected nematodes were processes with standard method for feature research. New species Rhabdochona (Rhabdochona) sindhicus differs from other species of genus with body shape and size, buccal capsule shape, prostomal teeth arrangement, nerve ring position, 18 pairs of caudal papillae, spicules shape curved and broad anteriorly and pointed posteriorly, female genital structures, shape of posterior end in male and female, eggs shape and boundary. Due to morphometric differences between present and previously described species of Rhabdochona the Rhabdochona sindhicus n. sp. proposed.

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The aimed of present studies to examination of helminth parasites of Indus river Siluriformes catfishes. 57 (41 + and 16 ) specimens were collected from 31 hosts fishes Rita rita (F. Hamilton, 1822) belong to genus Spirocamallanus (Baylis, 1923) processes as live specimen were killed in hot 70% ethanol, preserved, made temporary mounts for detail study. On the basis of differential characters such as body shape and size, striated cuticle format, buccal capsule shape and 13-14 spiral numbers, cephalic and cervical papillae, basal ring shape, spicules shape and size, vulva position and shape, vagina shape, the new species Spirocamallanus sindensis identified.