Long-term trends in catch and effort in the KwaZulu-Natal nearshore linefisheries

Penney, Andrew J.; Mann, Judy; Elst, R.P. van der; Wilke, CG

doi:10.2989/025776199784125890

Cited by 39 publications

(24 citation statements)

References 6 publications

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“…Despite the popularity of recreational marine linefishing in South Africa, only limited aspects of the skiboat, shore-and spearfishery have been subjected to detailed investigation (Joubert 1981, Clarke and Buxton 1989, Coetzee et al 1989, Hughes 1989, Bennett 1991, Bennett et al 1994, Brouwer et al 1997, Mann et al 1997, McGrath et al 1997, Sauer et al 1997, Griffiths 1999a, Penney et al 1999. Research on the South African estuarine linefishery is even more limited, with the only published analysis on this fishery being restricted to the work by Marais and Baird (1980a) and Baird et al (1996) on the Swartkops and Sundays estuaries in the Eastern Cape, and an analysis of the Durban Bay linefishery in KwaZulu-Natal by Guastella (1994).…”

mentioning

confidence: 99%

Assessment of the recreational linefishery in selected Eastern Cape estuaries: trends in catches and effort

Pradervand¹,

Baird²

2002

South African Journal of Marine Science

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mentioning

confidence: 99%

Assessment of the recreational linefishery in selected Eastern Cape estuaries: trends in catches and effort

Pradervand¹,

Baird²

2002

South African Journal of Marine Science

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“…Similar patterns are evident in the KwaZulu-Natal linefish fisheries, where total catch and catch per unit effort have decreased since the early 1900s, with most resident species now overexploited (Penney et al 1999, Mann 2000. Current catch composition shows an increased contribution from small rather than large reef fish species and shoaling migrant species and, as in Cape waters, a decrease in large reef dwellers such as seventy-four, red steenbras Petrus rupestris and rock cods (Penney et al 1999). Clark (2006) had speculated that under climate change, fish species on the East Coast should occupy waters farther south, whereas species on the West Coast might be displaced to greater depths or become restricted to the immediate vicinity of upwelling.…”

Section: Changes In Distribution and Local Abundancementioning

confidence: 57%

Reviewing evidence of marine ecosystem change off South Africa

Moloney

Fennessy

Gibbons

et al. 2013

African Journal of Marine Science

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Recent changes have been observed in South African marine ecosystems. The main pressures on these ecosystems are fishing, climate change, pollution, ocean acidification and mining. The best long-term datasets are for trends in fishing pressures but there are many gaps, especially for non-commercial species. Fishing pressures have varied over time, depending on the species being caught. Little information exists for trends in other anthropogenic pressures. Field observations of environmental variables are limited in time and space. Remotely sensed satellite data have improved spatial and temporal coverage but the time-series are still too short to distinguish long-term trends from interannual and decadal variability. There are indications of recent cooling on the West and South coasts and warming on the East Coast over a period of 20-30 years. Oxygen concentrations on the West Coast have decreased over this period. Observed changes in offshore marine communities include southward and eastward changes in species distributions, changes in abundance of species, and probable alterations in foodweb dynamics. Causes of observed changes are difficult to attribute. Full understanding of marine ecosystem change requires ongoing and effective data collection, management and archiving, and coordination in carrying out ecosystem research.

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“…First, most of the resources have been over-exploited, e.g. linefish and abalone Haliotis midae (Attwood and Farquhar 1999, Hauck and Sweijd, 1999, Penney et al 1999, Griffiths 2000. In some instances informal/subsistence use of the resources overlaps with the other formal fisheries sectors, but because it has not previously been factored into the fishery management strategy, it represents an additional unaccounted catch and in many cases this has contributed to unsustainable use and resource depletion .…”

Section: Rationalementioning

confidence: 99%

“…In compiling this list, recent reviews of the status of marine resources in South African were used (e.g. Fielding et al 1994, Lamberth et al 1997, Penney et al 1999, Mann 2000. It was recognized that these data are incomplete and that assessments of individual species must be made to produce a definitive list.…”

Section: Recommendationsmentioning

confidence: 99%