https://commons.ufh.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 A histological description of ovarian recrudescence in two Labeo victorianus populations https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35455 Wed 12 May 2021 23:59:37 SAST ]]> Adult African sharptooth catfish, Clarias gariepinus, population dynamics in a small invaded warm-temperate impoundment https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35461 150 cm TL, >30 kg; Bruton 1976), long-lived (validated to at least 15 years, Weyl & Booth 2008) and fast-growing (Bruton & Allanson 1980; Quick & Bruton 1984; Richardson et al. 2009) fish that attains sexual maturity within two years of age (de Moor & Bruton 1988). It is eurythermic (80–35°C), mesohalic (0–10 ppt) and has the ability to airbreathe. These attributes predispose it to surviving in all but the most adverse of conditions and have directly contributed to its wide use as an aquaculture species. These attributes have also contributed to its ability to invade waterbodies beyond its natural range (de Moor & Bruton 1988) and after inadvertent introductions such as by escape from aquaculture facilities or through water transfer schemes, C. gariepinus has established populations in many non-native environments. Such invasions include the Philippines (Mercene 1997), Bangladesh (Arthur & Ahmed 2002), Thailand (Vidthayanon 2005), India (Bhakta & Bandyopadhyay 2007) and Brazil (Cambray 2005; Vitule et al. 2006; Rocha & Schiavetti 2007). In South Africa, C. gariepinus invaded the temperate Great Fish River catchment after the species was translocated from the Orange River through a Interbasin Water Transfer (IBWT) scheme (Laurenson et al. 1989). Potential threats include predation of and competition with indigenous species, habitat degradation, and the spread of diseases and parasites (Dudgeon et al. 2006).]]> Wed 12 May 2021 22:23:17 SAST ]]> Ocean warming affects the distribution and abundance of resident fishes by changing their reproductive scope https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35775 Wed 12 May 2021 21:00:18 SAST ]]> Establishment of translocated populations of smallmouth yellowfish, Labeobarbus aeneus (Pisces: Cyprinidae), in lentic and lotic habitats in the Great Fish River system, South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35607 Wed 12 May 2021 20:59:23 SAST ]]> A comparison of three techniques for fluorochrome marking of juvenile Clarias gariepinus otoliths https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35450 Wed 12 May 2021 20:55:58 SAST ]]> Detecting impacts of invasive non-native sharptooth catfish, Clarias gariepinus, within invaded and non-invaded rivers. https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35539 Wed 12 May 2021 20:55:12 SAST ]]> An assessment of a light-attraction fishery in southern Lake Malawi https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35472 Wed 12 May 2021 19:11:37 SAST ]]> Spatio-temporal patterns in maturation of the chokka squid (Loligo vulgaris reynaudii) off the coast of South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6763 Wed 12 May 2021 18:57:54 SAST ]]> Effect of water temperature on the biogeography of South African estuarine fishes associated with the subtropical/warm temperate subtraction zone https://commons.ufh.ac.za/vital/access/manager/Repository/vital:7133 Wed 12 May 2021 18:49:33 SAST ]]> Spatial aspects of the reproductive and feeding biology of the striped robber, Brycinus lateralis (Pisces: Characidae), in the Okavango Delta, Botswana https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35944 Wed 12 May 2021 18:40:56 SAST ]]> Growth, reproduction and population structure of Diplotaxodon limnothrissa in the southeast arm of Lake Malawi https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35633 Wed 12 May 2021 18:32:19 SAST ]]> On the life history of the lesser gurnard (Scorpaeniformes: Triglidae) inhabiting the Agulhas Bank, South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35782 Wed 12 May 2021 18:18:34 SAST ]]> Reproductive biology of ningu, Labeo victorianus (pisces: cyprinidae), in the kagera and Sio rivers, Uganda https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35827 Wed 12 May 2021 18:17:59 SAST ]]> Computer-aided identification of coelacanths, latimeria chalumnae, using scale patterns https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35526 Wed 12 May 2021 17:59:12 SAST ]]> Spatial description of hake-directed fishing activity off the west coast of South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35945 Wed 12 May 2021 17:41:04 SAST ]]> Incorporating the spatial component of fisheries data into stock assessment models https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35698 Wed 12 May 2021 17:38:56 SAST ]]> Shark fishing effort and catch of the ragged-tooth shark Carcharias taurus in the South African competitive shore-angling fishery https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35937 Wed 12 May 2021 16:47:54 SAST ]]> A qualitative ecological risk assessment of the invasive Nile tilapia, Oreochromis niloticus in a sub-tropical African river system (Limpopo River, South Africa) https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35457 Wed 12 May 2021 15:49:04 SAST ]]> Do environmental factors influence the movement of estuarine fish? A case study using acoustic telemetry https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6772 Wed 07 Jul 2021 13:34:53 SAST ]]> Assessment of the monkfish Lophius vomerinus resource off Namibia https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35509 Tue 09 Aug 2022 15:05:37 SAST ]]> Aspects of the reproductive biology of monkfish Lophius vomerinus off Namibia https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35504 50cm total length was strongly biased towards females. There was reproductive activity throughout the year, peaking slightly between autumn and spring.]]> Tue 09 Aug 2022 15:05:35 SAST ]]> Quantifying commercial catch and effort of monkfish Lophius vomerinus and L. vaillanti off Namibia https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35817 Tue 09 Aug 2022 15:05:35 SAST ]]> Factors affecting recapture rates of raggedtooth sharks Carcharias taurus tagged off the east coast of South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35618 Tue 06 Jul 2021 09:15:43 SAST ]]> Long-term catch and effort trends in Eastern Cape Angling Week competitions https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35711 Tue 06 Jul 2021 09:15:41 SAST ]]> Life history and population dynamics of invasive common carp, Cyprinus carpio, within a large turbid African impoundment https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35708 Thu 29 Jul 2021 16:22:45 SAST ]]> Life history strategy and population characteristics of an unexploited riverine cyprinid, Labeo capensis, in the largest impoundment in the Orange River Basin https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35709 Thu 29 Jul 2021 16:22:44 SAST ]]> Life-history characteristics of an age-validated established invasive African sharptooth catfish, Clarias gariepinus, population in a warm–temperate African impoundment https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35710 Thu 29 Jul 2021 16:22:44 SAST ]]> Quantifying the annual fish harvest from South Africa’s largest freshwater reservoir https://commons.ufh.ac.za/vital/access/manager/Repository/vital:7149 Thu 29 Jul 2021 16:22:43 SAST ]]> Effect of turbidity on the foraging success of Glossogobius callidus (Teleostei: Gobiidae) https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35600 Thu 15 Jul 2021 19:45:36 SAST ]]> Population structure and growth of polydorid polychaetes that infest cultured abalone Haliotis midae https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35812 Thu 13 May 2021 15:38:01 SAST ]]> Ecological niche modeling of the invasive potential of Nile tilapia Oreochromis niloticus in African river systems: concerns and implications for the conservation of indigenous congenerics https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35596 Thu 13 May 2021 14:17:41 SAST ]]> Evolution of Labeo victorianus predates the Pleistocene desiccation of Lake Victoria: evidence from mitochondrial DNA sequence variation https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6762 Thu 13 May 2021 10:42:03 SAST ]]> Rapid biological assessment of the fishery potential of Xonxa Dam, near Queenstown, South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35818 Thu 13 May 2021 08:14:55 SAST ]]> Histological validation of gonadal macroscopic staging criteria for Labeo cylindricus (Pisces: Cyprinidae) https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35634 Thu 13 May 2021 08:08:28 SAST ]]> Spatial and seasonal distribution patterns of juvenile and adult raggedtooth sharks (Carcharias taurus) tagged off the east coast of South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35942 Thu 13 May 2021 07:25:06 SAST ]]> Preliminary observations of tag shedding, tag reporting, tag wounds, and tag biofouling for raggedtooth sharks (Carcharias taurus) tagged off the east coast of South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35816 Thu 13 May 2021 06:34:37 SAST ]]> Retrospective stock assessment of the Emperor red snapper (Lutjanus sebae) on the Seychelles Bank between 1977 and 2006 https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35829 Thu 13 May 2021 05:21:35 SAST ]]> Induced ovulation, spawning, egg incubation, and hatching of the cyprinid fish Labeo victorianus in captivity https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35697 Thu 13 May 2021 05:02:33 SAST ]]> Spatial and seasonal distribution patterns of the ragged-tooth shark Carcharias taurus along the coast of South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35943 Thu 13 May 2021 04:57:09 SAST ]]> An invader within an altered landscape: one catfish, two rivers and an inter-basin water transfer scheme https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35494 Thu 13 May 2021 04:37:16 SAST ]]> Movement patterns and habitat selection of invasive African sharptooth catfish https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35767 Thu 13 May 2021 04:06:39 SAST ]]> Reproductive and feeding biology of the Natal mountain catfish, Amphilius natalensis (Siluriformes: Amphiliidae) https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35823 Thu 13 May 2021 04:00:31 SAST ]]> Spatial patterns in the biology of the chokka squid, Loligo reynaudii on the Agulhas Bank, South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35947 Thu 13 May 2021 03:57:13 SAST ]]> Predictor variables for moggel (Labeo umbratus) biomass and production in small South African reservoirs https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35815 Thu 13 May 2021 03:38:10 SAST ]]> Reproductive biology of a riverine cyprinid, Labeo umbratus (Teleostei: Cyprinidae), in small South African reservoirs https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35826 Thu 13 May 2021 03:36:14 SAST ]]> Inter-seasonal persistence and size-structuring of two minnow species within headwater streams in the Eastern Cape, South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35705 Thu 13 May 2021 03:22:53 SAST ]]> Maximum likelihood and Bayesian approaches to stock assessment when data are questionable https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6764 Thu 13 May 2021 03:19:56 SAST ]]> Ocean warming, a rapid distributional shift, and the hybridization of a coastal fish species https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35777 Thu 13 May 2021 03:14:05 SAST ]]> Effect of water temperature on the biogeography of South African estuarine fishes associated with the subtropical/warm temperate subtraction zone https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6766 Thu 13 May 2021 02:56:15 SAST ]]> Age validation, growth, mortality, and demographic modeling of spotted gully shark (Triakis megalopterus) from the southeast coast of South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35466 0.05), and von Bertalanffy growth model parameters for combined sexes were estimated to be L∞=1711.07 mm TL, k=0.11/yr and t0= –2.43 yr (n=86). Natural mortality was estimated at 0.17/yr. Age at maturity was estimated at 11 years for males and 15 years for females. Results of the demographic analysis showed that the population, in the absence of fishing mortality, was stable and not significantly different from zero and particularly sensitive to overfishing. At the current age at first capture and natural mortality rate, the fishing mortality rate required to result in negative population growth was low at F>0.004/ yr. Elasticity analysis revealed that juvenile survival was the principal factor in explaining variability in population growth rate.]]> Thu 13 May 2021 02:39:30 SAST ]]> On the life history of a cyprinid fish, Labeo cylindricus https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35780 Thu 13 May 2021 02:33:49 SAST ]]> Some life-history parameters of the non-native amphipod Platorchestia platensis (Talitridae) in a warm temperate South African estuary https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35940 Thu 13 May 2021 01:58:45 SAST ]]> Estuarine use by spotted grunter Pomadasys commersonnii in a South African estuary, as determined by acoustic telemetry https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35612 Thu 13 May 2021 01:49:25 SAST ]]> Marine Reserves: a guide to science, design, and use https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35714 Thu 13 May 2021 01:28:52 SAST ]]> Integrating stomach content and stable isotope analyses to elucidate the feeding habits of non-native sharptooth catfish Clarias gariepinus https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35703 Thu 13 May 2021 01:03:38 SAST ]]> Seasonality, behaviour and philopatry of spotted ragged tooth sharks Carcharias taurus in Eastern Cape nursery areas, South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35910 Thu 11 Aug 2022 06:40:29 SAST ]]> Aspects of the biology and life history of largespot pompano, Trachinotus botla, in South Africa https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35499 Thu 11 Aug 2022 06:39:57 SAST ]]> A description of gametogenesis in the panga Pterogymnus laniarius (Pisces: Sparidae) with comments on changes in maturity patterns over the past two decades https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35452 Thu 11 Aug 2022 06:39:06 SAST ]]> Pessimistic assessment of white shark population status in South Africa: comment on Andreotti et al.(2016) https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35799 Thu 11 Aug 2022 06:38:19 SAST ]]> An endangered seahorse selectively chooses an artificial structure https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35486 Thu 11 Aug 2022 06:37:36 SAST ]]> Environmental niche patterns of native and non-native fishes within an invaded African river system https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35605 Thu 11 Aug 2022 06:36:08 SAST ]]> Indicators of sustainable fishing for South African sardine Sardinops sagax and anchovy Engraulis encrasicolus https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35691 Sat 04 Dec 2021 12:39:20 SAST ]]> Occurrence of larval fishes in a rocky shore-associated nursery area in temperate South Africa, with emphasis on temperature-related growth in dominant Sparidae https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35774 500 larvae per net haul), peaking at ~7 500 larvae in a single haul that consisted mostly of postflexion-stage Sparidae. There was a weak, negative correlation (−0.24) between temperature and overall CPUE, which reflected either the seasonality or protracted nature of spawning by the species occurring in the bay. There was no significant difference in CPUE between the moon phases sampled on the spring tides in this study. Shark Bay was dominated by postflexionstage larvae, consisting in particular of species common to tide pools during the juvenile stage. Certain species were sampled for only short periods during the year. The year-round occurrence and high abundance of the two dominant species indicate that Shark Bay represents an important nursery habitat for the completion of the larval phase. These species exhibited exponential growth that lagged behind small increases in temperature, highlighting the importance of access to shallow, warm habitat that allows larval growth to increase, leading to earlier settlement into juvenile habitat and thereby reducing the pelagic larval duration.]]> Mon 30 Aug 2021 14:24:05 SAST ]]> Growth and longevity of Exosphaeroma hylocoetes (Isopoda) under varying conditions of salinity and temperature https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35630 Mon 30 Aug 2021 14:24:03 SAST ]]>