Articles by Author: Sven Kerwath

Search results for Sven Kerwath

We found 29 results for you
  1. First record of the Southeast Asian walking catfish, <em>Clarias batrachus</em> (Pisces: Clariidae), from the island of Mauritius, south-western Indian Ocean

    First record of the Southeast Asian walking catfish, <em>Clarias batrachus</em> (Pisces: Clariidae), from the island of Mauritius, south-western Indian Ocean

    Item type: Journal Article • Journal: African Zoology
    The presence of Southeast Asian walking catfish, Clarias batrachus, in Mauritian freshwater systems has been confirmed. Three female Clarias batrachus were caught in Rivière Sèche, close to the town of Phoenix, Mauritius (20°17′ S, 57°33′ E). This constitutes the first...
  2. An exploratory investigation of the fish communities associated with reefs on the central Agulhas Bank, South Africa

    An exploratory investigation of the fish communities associated with reefs on the central Agulhas Bank, South Africa

    Item type: Journal Article • Journal: African Zoology
    Despite their ecological and economic importance, the temperate reef habitats of the central Agulhas Bank remain poorly studied. From 2008 to 2010, multiple stations grouped into six general sites of varying depth, profile and distance offshore, were surveyed. A combination...
  3. First account of the metazoan parasite fauna of oilfish <em>Ruvettus pretiosus</em> Cocco, 1829 (Perciformes: Gempylidae) in South African waters

    First account of the metazoan parasite fauna of oilfish <em>Ruvettus pretiosus</em> Cocco, 1829 (Perciformes: Gempylidae) in South African waters

    Item type: Journal Article • Journal: African Zoology
    Parasites are an important but neglected component of ecosystems that can be used as indicators of host biology and ecology. In the present study, the metazoan parasite assemblage of Ruvettus pretiosus, an understudied but widely distributed predatory gempylid, caught off...
  4. A telemetry experiment on spotted grunter <em>Pomadasys commersonnii</em> in an African estuary

    A telemetry experiment on spotted grunter <em>Pomadasys commersonnii</em> in an African estuary

    Item type: Journal Article • Journal: African Journal of Marine Science
    The feasibility of using telemetry equipment to study the movements of estuarine-associated fish in South Africa was investigated by conducting a tracking experiment on spotted grunter Pomadasys commersonnii in the East Kleinemonde Estuary. The telemetry equipment comprised two VEMCO V8...
  5. A comparative evaluation of three methods used to tag South African linefish

    A comparative evaluation of three methods used to tag South African linefish

    Item type: Journal Article • Journal: African Journal of Marine Science
    Tagging effects and loss rates of 60 Roman Chrysoblephus laticeps tagged with dart tags with barbs (D-tags), T-bar filaments (T-tags) and visible implant fluorescent elastomer (VIFE) tags were investigated. The fish were tagged and monitored in a controlled tank experiment...
  6. Life-history parameters of white stumpnose <em>Rhabdosargus globiceps</em> (Pisces: Sparidae) in Saldanha Bay, South Africa, with evidence of stock separation

    Life-history parameters of white stumpnose <em>Rhabdosargus globiceps</em> (Pisces: Sparidae) in Saldanha Bay, South Africa, with evidence of stock separation

    Item type: Journal Article • Journal: African Journal of Marine Science
    White stumpnose Rhabdosargus globiceps were sampled over 24 months in Saldanha Bay on the west coast of South Africa. The species is a rudimentary hermaphrodite, with <1% of mature fish having simultaneously developed ovaries and testes. Spawning activity extended from...
  7. First documented southern transatlantic migration of a blue shark <em>Prionace glauca</em> tagged off South Africa

    First documented southern transatlantic migration of a blue shark <em>Prionace glauca</em> tagged off South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    The first documented recapture of a South African-tagged juvenile blue shark Prionace glauca off Uruguay lends weight to the hypothesis of a single blue shark population in the South Atlantic. The presence of neonate blue sharks with umbilical scars and...
  8. An alternative method for estimating the status of resident reef fish stocks, based on differential fishing effort across a marine reserve boundary

    An alternative method for estimating the status of resident reef fish stocks, based on differential fishing effort across a marine reserve boundary

    Item type: Journal Article • Journal: African Journal of Marine Science
    The stock status of roman Chrysoblephus laticeps was estimated in the Goukamma, a temperate South African marine protected area (MPA). Standardised catch per unit effort (CPUE) from a controlled angling survey on both sides of the MPA border was employed...
  9. Quantifying the degree of protection afforded by a no-take marine reserve on an exploited shark

    Quantifying the degree of protection afforded by a no-take marine reserve on an exploited shark

    Item type: Journal Article • Journal: African Journal of Marine Science
    Sharks have been shown to benefit from the protection of marine protected areas (MPAs). There is, however, little information on the degree of protection by MPAs to shark populations. The movements of individual smoothhound sharks Mustelus mustelus in, and adjacent...