Leading up to the National Moth Week on July 22, we interview some contributors of moth observations.Listen to the first podcast episode with Nagesh O. S. on the IBP blog.

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2 documents found tagged <i>puntius denisonii</i> [X]
  • Title
    Use of tricaine methanesulfonate (MS-222) to induce anaesthesia in Puntius denisonii (Day, 1865) (Teleostei: Cypriniformes: Cyprinidae), a threatened barb of the Western Ghats, India
    Type
    Journal Article
    Description
    Anaesthesia is essential to minimize stress and physical damage during handling of fish in captivity. In the present study, induction time in Puntius denisonii (Day, 1865), an endangered aquarium fish exposed to four concentrations of MS-222 (50 mg L-1, 100 mg L-1, 150 mg L-1 and 200 mg L-1) was determined. MS-222 appears to be highly effective as an anaesthetic with no side effects to both fish as well as humans. An induction time of less than or equal to three minutes, and a complete recovery in five minutes was used a basis to record the anaesthesia stages for different doses. The onsets of individual phases of anaesthesia and recovery stages were also studied. Concentration of 150mg L -1 (induction 165 plus or minus 10 seconds and recovery time 112 plus or minus 10 seconds) was determined as the lowest concentration that induces anaesthesia in P. denisonii in less than three minutes. Induction and recovery times were dose-dependent. An inversely proportional relationship was observed between concentrations of anaesthetic and induction time. This is the first study to investigate the efficacy of different concentrations of MS-222 in Puntius denisonii and will be helpful to develop standardised techniques for transportation, captive breeding and other ex-situ conservation plans for this endangered and endemic barb.
    Attribution
    Anna Mercy T.V., Malika V., Sajan S. (2013). Journal of Threatened Taxa 9(5) pp. 4414-4419; doi:10.11609/JoTT.o3294.4414-9
  • Title
    CEPF Western Ghats Special Series: Reproductive biology of Puntius denisonii, an endemic and threatened aquarium fish of the Western Ghats and its implications for conservation
    Type
    Journal Article
    Description
    This study presents fundamental information on the reproductive biology of Puntius denisonii, an endemic and threatened aquarium fish of the Western Ghats Hotspot. Results are based on the observations from three river systems, Chandragiri, Valapattannam and Chaliyar. Maximum observed total length in P. denisonii was 162mm and 132mm for males and females, respectively. Males attained sexual maturity at a lower size than females with mean size at first maturity determined as 85.33 plus or minus 1.52 mm for males and 95.66 plus or minus 1.15 mm for females. Puntius denisonii spawned from October to March with minor differences in the peak breeding months between the three river systems, which were studied. Sex ratio deviated significantly from 1:1 and was skewed in favour of males. Absolute fecundity varied from 376 (fish of 102mm total length) to 1098 (fish of 106mm total length) eggs. Currently, the closed seasons for P. denisonii have been put in place during June, July and October based on the (mis)assumption that the species breeds during these three months. However, the results of the present study have helped us to understand more about the reproductive biology of the species so as to recommend more appropriate seasonal closures. The months from October until March need to be designated as a closed season for protecting the breeding population of P. denisonii.
    Attribution
    Solomon S., Ramprasanth M.R., Baby F., Pereira B., Tharian J., Ali A., Raghavan R. (2011). Journal of Threatened Taxa 9(3) pp. 2071-2077; doi:10.11609/JoTT.o2608.2071-7