Articles by Keyword: Labeo Victorianus

Search results for Labeo Victorianus

We found 10 results for you
  1. A histological description of ovarian recrudescence in two <em>Labeo victorianus</em> populations

    A histological description of ovarian recrudescence in two <em>Labeo victorianus</em> populations

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The ovaries of Labeo victorianus are paired organs situated in the peritoneal cavity and suspended on either side of the midline by a mesovarium. A capsule, composed of dense, regularly-arranged collagen and elastic fibres mixed with a few smooth muscle...
  2. FISH SPECIES IN STEIUTONTEIN DAN, TUGELA-VAAI SYSTEM, SOUTH AFRICA

    FISH SPECIES IN STEIUTONTEIN DAN, TUGELA-VAAI SYSTEM, SOUTH AFRICA

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Two alien species and seven indigenous species, including two minnow species, were present in Sterkfontein Dam. Of the larger species, Barbus aeneus and Labco capensis were the dominant in terms of numbers.
  3. THE LENGTH/MASS RELATIONSHIP AND CONDITION OF LABEO CAPENSIS IN THE CALEDON RIVER

    THE LENGTH/MASS RELATIONSHIP AND CONDITION OF LABEO CAPENSIS IN THE CALEDON RIVER

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The length mass relationship for a Labeo capensis population is described by the equation M = 0,0134 L2'999 where 2,999 represents a constant the value of which indicates isometric growth. There is very little difference between the length/mass relationship for...
  4. NOTE ON THE OCCURRENCE OF A VENTRAL SUCKER-LIKE MOUTH FORM IN <em>LABEO UMBRATUS</em> (PISCES, CYPRINIDAE)

    NOTE ON THE OCCURRENCE OF A VENTRAL SUCKER-LIKE MOUTH FORM IN <em>LABEO UMBRATUS</em> (PISCES, CYPRINIDAE)

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The occurrence of a ventral sucker-like mouth form in certain populations of Labeo umbratus, which are free from competition by L. aapensis, is reported. It is proposed that this might be an adaptation to feeding off stones which enhances the...
  5. POSSIBLE ADAPTIVE SIGNIFICANCE OF SEX RATIO AND SEXUAL DIFFERENCES IN SIZE AT MATURITY IN THE ORANGE RIVER LABEO, <em>LABEO CAPENSIS</em>

    POSSIBLE ADAPTIVE SIGNIFICANCE OF SEX RATIO AND SEXUAL DIFFERENCES IN SIZE AT MATURITY IN THE ORANGE RIVER LABEO, <em>LABEO CAPENSIS</em>

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Labeo capensis spawns on inundated vegetation during flood periods. Suitable conditions for spawning are of short duration and do not allow time for extended breeding behaviour. The success of fertilisation is therefore probably independent of the size of males. This...
  6. AGE AND GROWTH OF <em>LABEO UMBRATUS</em> (PISCES: CYPRINIDAE) IN LAKE LE ROUX ON THE ORANGE RIVER, SOUTH AFRICA

    AGE AND GROWTH OF <em>LABEO UMBRATUS</em> (PISCES: CYPRINIDAE) IN LAKE LE ROUX ON THE ORANGE RIVER, SOUTH AFRICA

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Age, growth and relative body condition of Labeo umbratus in Lake le Roux were investigated from samples collected from 1979 to 1982. Annuli are formed once a year on the scales and otoliths as growth commences in spring or early...
  7. FURTHER OBSERVATIONS ON THE BREEDING BEHAVIOUR OF <em>LABEO UMBRATUS</em> (SMITH) (PISCES: CYPRINIDAE)

    FURTHER OBSERVATIONS ON THE BREEDING BEHAVIOUR OF <em>LABEO UMBRATUS</em> (SMITH) (PISCES: CYPRINIDAE)

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Breeding behaviour of Labeo umbratus was observed in the Modder River, Orange Free State, and ova were collected from below the site and hatched. Fry were reared for 12 months to confirm the identification of the ova collected. The behaviour...
  8. INDUCED SPAWNING OF MOGGEL, LABEO UMBRATUS (SMITH) (PISCES: CYPRINIDAE)

    INDUCED SPAWNING OF MOGGEL, LABEO UMBRATUS (SMITH) (PISCES: CYPRINIDAE)

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Ripe female Labeo umbratus, captured in Lake Mentz on the Sundays River, were artificially spawned following a series of injections with human chorionic gonadotrophin and homogenized L. umbratue pituitaries. The eggs were stripped and fertiUzed with milt from untreated male...
  9. Microcystin-LR equivalent concentrations in fish tissue during a postbloom <em>Microcystis</em> exposure in Loskop Dam, South Africa

    Microcystin-LR equivalent concentrations in fish tissue during a postbloom <em>Microcystis</em> exposure in Loskop Dam, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The effects of a decomposing cyanobacteria bloom on water quality and the accumulation of microcystin-LR equivalent toxin in fish at Loskop Dam were studied in May 2012. Enzyme-linked immunosorbent assay [ELISA] was used to confirm the presence of microcystin-LR equivalent...