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fishes (3.33). The prevalence (90%) and intensity the eastern belt of Bangladesh.This is a
(2.78) of trematodes were highest among the monovoltine insect and host specific on the mango
parasite groups. Both the prevalence and intensity tree. Mangifera indica. It is strictly monophagous
were highest in the intermediate length and weight and survives only on mango. During the off season
groups of fishes. (May-September, 1998-1999) they were supplied
with tender stem and young leaves of mango plants
167 PARVEEN, R.; ISLAM, A. & in the laboratory condition (28 ± 5°C). The weevils
D'SILVA, J. (Dept. of Zoology, Dhaka consumed the supplied food and the quantity of the
University, Dhaka). HELMINTH PARASITES IN food consumed increased gradually. Several
NANDUS NANDUS (HAM.-BUCH., 1822). Bang. mango weevils from the experimental stock were
J. Life Sci,, 2007, 19 (1), 101-106. examined by dissecting them during May-
September.The study showed that the females with
A total of 8 species of helminth parasites in developing eggs in their ovaries consumed much
Nandus nandus (Ham.-Buch. 1822) were collected. of the supplied food.
Among them, 2 species were trematodes:
Coitocaecum orthorchis and Clinostomum 169 BEGUM, M. & CURTIS, C. ( Dept. of
piscidium; 1 species and 1 genera of cestodes: Infectious and Tropical Disease, London School of
Bothriocephalus. cuspidauts and Diplopylidium Hygiene and Tropical Medicine, London University,
sp.; 1 species and 2 genera of nematodes: UK). COMPARISONS OF PERSISTENCE OF
Gnathostoma spinigerum, Contracaecum sp. and THE BIOLOGICAL LARVICIDE, BACILLUS
Porrocaecum sp., 1 species of acanthocephala: THURINGIENSIS ISRAELENSIS (BTI) AND THE
Pallisentis nandai, were found in the intestine of INSECT GROWTH REGULATORS. DIMILIN
host. The overall prevalence and intensity of AND PYRIPROXYFEN AGAINST THE
infection was 55% and 3.72, respectively. The LARVAE OF ANOPHELES STEPHENSI. Bang.
prevalence was higher (65.21%) in female than in J. Zool., 2007, 35 (1), 19-25.
male (41.17%) fishes. Similarly, the intensity in
the male and female fishes were 4.00 and 3.6, The persistence of three alternatives to
respectively.The highest number of host fish was conventional anti-mosquito larvicides was
infected by nematode parasites (45%) with the investigated. The tests were conducted in 10 litre
highest mean intensity 2.22. Among the parasites, plastic tanks in which a layer of soil was
Porrocaecum sp. had the highest prevalence introduced to create semi-natural conditions.
(22.5%) and Clinostomum piscidium had the Formulations of Bacillus thuringiensis israelensis
lowest prevalence. Fishes of intermediate length (Bti) and two insect growth regulators (IGRs) were
but, highest weight group had highest prevalence added at the doses recommended by the
of infection. manufacturers. Samples were taken at intervals,
dilutions were made and bioassays were carried
th
out with the laboratory reared 4 instar larvae of
597. 7 : ZOOLOGY : INSECTA Anopheles stephensi. Bactolarvicide, Larviol and
ENTO MOLOGY Vectobac 12AS formulations of Bti gave high
mortality within 24 hours when tested in clean tap
168 BASHAR, M.A.; RAHMAN, M. (Dept. of water, but their activity decreased after coming in
Zoology, Dhaka University, Dhaka) & HOSSAIN, contact with the soil. Samples taken from the tanks
M.A. (Dept. of Zoology, Dohar, Nababganj 30 days after setting them up gave no mortality
College, Nababganj, Dhaka). SOME ASPECTS after 24 hours, but there was some evidence for
OF FOOD HABITS AND GONADAL slight residual activity on the longer exposure of
DEVOLOPMENT OF STERNOCHETUS larvae. Among the IGRs. both Dimilin tablet and
FRIGIDUS (COL: CURCULIONDAE) IN OFF granular formulations and pyriproxyfen inhibited
SEASON. Bang. J. Zool., 2006, 34 (2), 213-220. adult emergence by 80-100 per cent in the samples
taken from the tanks up to 90 days after setting
The Common mango weevil, Sternochetus them up.
frigidus, is an important pest of green mango along
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