Articles by Keyword: Fecundity

Search results for Fecundity

We found 26 results for you
  1. AN EXPERIMENTAL EVALUATION OF THE INFLUENCE OF TEMPERATURE ON THE NATURAL RATE OF INCREASE OF <em>DAPHNIA PULEX</em> DE GEER

    AN EXPERIMENTAL EVALUATION OF THE INFLUENCE OF TEMPERATURE ON THE NATURAL RATE OF INCREASE OF <em>DAPHNIA PULEX</em> DE GEER

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Cohorts of Daphnia pulex from Boskop Dam, an irrigation reservoir near Potchefstroom, Transvaal, were kept at natural food levels under constant temperatures of 10, 15 and 20°C as well as under conditions of temperature with a diurnal fluctuation varying between...
  2. BREEDING BEHAVIOUR OF THE MPASA, <em>OPSARIDIUM MICROLEPIS</em> (GUNTHER) (PISCES:CYPRINIDAE), IN LAKE MALAWI

    BREEDING BEHAVIOUR OF THE MPASA, <em>OPSARIDIUM MICROLEPIS</em> (GUNTHER) (PISCES:CYPRINIDAE), IN LAKE MALAWI

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Observations on the breeding behaviour of mpasa, a commercially valuable cyprinid endemic to Lake Malawi, were conducted in the Bua and North Rukuru Rivers. The spawning run takes place over an extended period during and after the rains, with an...
  3. The biology of <em>Barbus mattozi</em> Guimaraes (Teleostei: Cyprinidae) in a Zimbabwean reservoir 4: Reproduction

    The biology of <em>Barbus mattozi</em> Guimaraes (Teleostei: Cyprinidae) in a Zimbabwean reservoir 4: Reproduction

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Spawning of Barbus mattozi in the Mtsheleli Dam, Zimbabwe, is highly seasonal and timed to take place with the first floods. In December 1974, the Mtsheleli River flooded after heavy rain and the entire adult population of B. mattozi migrated...
  4. Reproductive biology of a riverine cyprinid, <em>Labeo umbratus</em> (Teleostei: Cyprinidae), in small South African reservoirs

    Reproductive biology of a riverine cyprinid, <em>Labeo umbratus</em> (Teleostei: Cyprinidae), in small South African reservoirs

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The reproductive and recruitment characteristics of moggel, Labeo umbratus, populations were examined in four small South African reservoirs. Reproduction, characterised by an extended spawning season, high fecundity, short incubation time and rapid larval development, appears to be ideally suited to...
  5. Reproductive strategy of <em>Labeo senegalensis</em> Valenciennes 1842 (Teleostei: Cyprinidae) in the Ouémé basin, Benin

    Reproductive strategy of <em>Labeo senegalensis</em> Valenciennes 1842 (Teleostei: Cyprinidae) in the Ouémé basin, Benin

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Aspects of the reproductive biology and population structure of Labeo senegalensis were investigated in the Ouémé River between April 2005 and March 2006. Reproductive strategy was investigated using gonadosomatic index, ovarian structure and fecundity. Average size-at-first-maturity (L 50) was estimated...
  6. The breeding biology of the southern barred minnow <em>Opsaridium peringueyi</em> (Gilchrist and Thompson 1913) in the Incomati and Luvuvhu river systems, South Africa

    The breeding biology of the southern barred minnow <em>Opsaridium peringueyi</em> (Gilchrist and Thompson 1913) in the Incomati and Luvuvhu river systems, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Data collected at two sites in the Luvuvhu and Sabie rivers show that, based on the gonadosomatic index, Opsaridium peringueyi has one major annual breeding event that occurs in early summer, following a period during which the general condition of...
  7. Population structure and reproductive biology of <em>Schilbe intermedius</em> (Teleostei: Schilbeidae) in the Pendjari River, Benin

    Population structure and reproductive biology of <em>Schilbe intermedius</em> (Teleostei: Schilbeidae) in the Pendjari River, Benin

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    This study, the first on fish reproduction in the Pendjari River, investigated aspects of the reproductive biology of Schilbe intermedius. A total of 429 females and 239 males were collected from March 2007 to February 2008. Females were larger than...
  8. Reproductive biology of <em>Bagrus docmak</em> in the Victoria Nile, Uganda

    Reproductive biology of <em>Bagrus docmak</em> in the Victoria Nile, Uganda

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Aspects of the reproductive biology of Bagrus docmak in the Victoria Nile were investigated between November 2005 and October 2006. Macroscopic and histological analysis of the gonads confirmed it as an asynchronous batch spawner which spawns throughout the year with...
  9. Fecundity of spiny lobster <em>Palinurus gilchristi</em> (Decapoda: Palinuridae) off South Africa

    Fecundity of spiny lobster <em>Palinurus gilchristi</em> (Decapoda: Palinuridae) off South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Fecundity of spiny lobster Palinurus gilchristi was investigated on traditional lobster fishing grounds on the Agulhas Bank, from Mossel Bay to Algoa Bay, and Port Alfred, based on early- and late-stage egg masses collected from 415 mature females (58–118mm carapace...
  10. Growth and reproduction of the pelagic goby <em>Sufflogobius bibarbatus</em> off the Orange River, southern Africa

    Growth and reproduction of the pelagic goby <em>Sufflogobius bibarbatus</em> off the Orange River, southern Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Age, growth and reproduction of the pelagic goby Sufflogobius bibarbatus was investigated for males and females caught in demersal trawls between the Orange River and Port Nolloth on the west coast of southern Africa. Females had larger otoliths than males...