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Description of three new species of Gyrodactylus von Nordmann, 1832 (Monogenea) parasitising Oreochromis niloticus niloticus (L.) and O. mossambicus (Peters) (Cichlidae)

100%

Garcia-Vasquez A., Hansen H., Christison K. W., Bron J. E., Shinn A. P.

Acta Parasitologica

2011

tom 56

nr 1

One previously described and 1 new species of Nanotrema Paperna, 1969 are reported from the gills of Citharinus citharus citharus (Citharinidae) collected from the Niokolo Koba River, Senegal. Nanotrema citharini Paperna, 1969 is redescribed, based on the re-examination of the type specimens and new information obtained from material taken in Senegal (new locality record). Nanotrema niokoloensis sp. nov. is distinguished primarily by possessing a copulatory organ composed of a long thin tube with median portion usually coiled into about 2.5 rings and an accessory piece resembling a braid lying within the rings. Based on the presence of the dorsal anchors modified into paired haptoral spikes, which lack an associated bar, species of Nanotrema phenotypically appear to be related to those of Neotropical Rhinoxenus Kritsky, Boeger et Thatcher, 1988 and Indian Spicocleidus Agrawal, Tripathi et Shukla, 2005.

Acute toxicity of water extracts of bark of the neem plant, Azadirachta indica [Lodd] to the cichlid, Tilapia zilli [Gervais]

100%

Omoregie E., Okpanachi M. A.

Acta Hydrobiologica

1997

tom 39

nr 1-2

The effects of the extract on the mortality rate, opercular ventilation rate and some behavioural responses of T. zilli were investigated under laboratory conditions, over a 96 h exposure period. The 96 h LC50 was determined as 6.03 mg L-1. The extract led to an initial increase in the opercular ventilation rates which then decreased significantly (P<0.05). Prior to death, darkening of the exposed fish, erratic swimming, and respiratory distress were observed. The implication of these findings in relation to environmental pollution is discussed.

Ograniczanie wyników

1 Acta Hydrobiologica

1 Acta Parasitologica

1 Bron J. E.

1 Christison K. W.

1 Garcia-Vasquez A.

1 Hansen H.

1 Okpanachi M. A.

1 Omoregie E.

1 Shinn A. P.

1 2011

1 1997

Wyniki wyszukiwania

Description of three new species of Gyrodactylus von Nordmann, 1832 (Monogenea) parasitising Oreochromis niloticus niloticus (L.) and O. mossambicus (Peters) (Cichlidae)

Acute toxicity of water extracts of bark of the neem plant, Azadirachta indica [Lodd] to the cichlid, Tilapia zilli [Gervais]