Long-term trends in the competitive shore fishery along the KwaZulu-Natal coast, South Africa

Pradervand, P.; Mann, B.Q.; Bellis, M. F.

doi:10.1080/15627020.2007.11407399

Cited by 21 publications

(17 citation statements)

References 1 publication

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“…6f). Angling pressure for these species was elevated (Pradervand et al 2007) and likely overcompensated for the previous decrease in natural mortality. At the same time, catches of rays and bony fish increased (Fig.…”

Section: Ecosystem Consequencesmentioning

confidence: 99%

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Patterns and ecosystem consequences of shark declines in the ocean

Ferretti¹,

Worm²,

Britten³

et al. 2010

Ecology Letters

773

636

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Whereas many land predators disappeared before their ecological roles were studied, the decline of marine apex predators is still unfolding. Large sharks in particular have experienced rapid declines over the last decades. In this study, we review the documented changes in exploited elasmobranch communities in coastal, demersal, and pelagic habitats, and synthesize the effects of sharks on their prey and wider communities. We show that the high natural diversity and abundance of sharks is vulnerable to even light fishing pressure. The decline of large predatory sharks reduces natural mortality in a range of prey, contributing to changes in abundance, distribution, and behaviour of small elasmobranchs, marine mammals, and sea turtles that have few other predators. Through direct predation and behavioural modifications, top-down effects of sharks have led to cascading changes in some coastal ecosystems. In demersal and pelagic communities, there is increasing evidence of mesopredator release, but cascading effects are more hypothetical. Here, fishing pressure on mesopredators may mask or even reverse some ecosystem effects. In conclusion, large sharks can exert strong top-down forces with the potential to shape marine communities over large spatial and temporal scales. Yet more empirical evidence is needed to test the generality of these effects throughout the ocean.

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Section: Ecosystem Consequencesmentioning

confidence: 99%

“…6g,h), likely benefitting from reduced predation and competition from sharks. Pradervand et al (2007) cautioned that these trends may have been influenced by changes in fishing technology or attitude, yet clear evidence for these mechanisms is missing.…”

Section: Ecosystem Consequencesmentioning

confidence: 99%

Patterns and ecosystem consequences of shark declines in the ocean

Ferretti¹,

Worm²,

Britten³

et al. 2010

Ecology Letters

773

636

View full text Add to dashboard Cite

show abstract

“…The average catch was 4.2 (AE3.2, n = 164) fish fisher À1 day À1 , larger than that of Cox et al (2003) for rainbow trout fishing in the lakes of British Columbia (1.2 fish fisher À1 day À1 ), but lower than 19.78 (AE1.06, n = 1271) fish fisher À1 day À1 reported by Morales-Nin et al (2005) for coastal anglers on the island of Majorca. Using the mean fishing time in Eqn (2) gave an average of 0.82 (AE0.62, n = 164) f fish fisher À1 h À1 , which is greater than Beckley et al (2008) (0.064 fish fisher À1 h À1 ), Rangel and Erzini (2007) on the northern coast of Portugal (0.42 fish fisher À1 h À1 ), Gartside et al (1999) in Australia (0.47 fish fisher À1 h À1 ) and Pradervand et al (2007) on the coast of South Africa (0.25 fish fisher À1 h À1 ). Veiga et al (2010) reported higher values (1.1 fish fisher À1 h À1 ) for anglers on the southern coast of Portugal, and Llompart et al (2012) found that anglers in the San Blas Bay (Argentina) had yields of 1.28 fish fisher À1 h À1 , which they considered to be the highest in the southern hemisphere.…”

Section: Discussionmentioning

confidence: 99%

Biological and socio‐economic aspects of recreational fisheries and their implications for the management of coastal urban areas of south‐eastern Brazil

Barrella

Ramires

Rotundo

et al. 2016

Fisheries Management Eco

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A total of 442 anglers in a coastal region of SE Brazil were interviewed to obtain information about recreational fishing. The anglers were mature individuals (mean age ≈43 years) with a high level of education. However, many did not have a fishing licence. Target fishes belonged to 47 species. Mean catch (Catch per unit effort ‐ CPUE) was 4.2 fish−1 day−1 or 488 g−1 angler−1 day−1. Total estimated catch in the study period was equivalent to 2% of commercial landings, indicating that recreational fishing has little impact on fish stocks. The anglers complained that fishing conditions had worsened because of environmental degradation. Catch‐and‐release was classified as a ‘good’ attitude despite reports of practices that caused suffering to fish. However, when asked about prohibition of catch‐and‐release, which is enforced in some countries, the anglers said they would not accept such a prohibition if proposed by Brazilian fishing authorities. As a general rule, issues related to animal welfare and animal rights are not discussed widely by society or by fishing authorities in Brazil. Suggestions for integrated management of coastal resources and for monitoring recreational fishing are presented.

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“…Allen et al (2013) attempted to quantify the value of minimum size limits to prevent recruitment overfishing and found that larger minimum lengths were required if anglers were not discouraged from fishing by reduced fish abundance. The 43% decrease in shore angling effort recorded along the KZN coast between 1994and 2007-2008(Mann et al 2008 suggests that there may have been some response to the overall reduction in L. amia CPUE in the region. However, as the decline in fishing effort was attributed to security concerns and the ban on beach driving (Mann et al 2008), it is likely that there is a weak responsiveness to reductions in fish abundance.…”

Section: Discussionmentioning

confidence: 99%

“…No reward was offered for submission of cards. KwaZulu-Natal Coast Anglers Union (KZNCAU) held formalised recreational shore angling tournaments, where the objective is points scoring, which can lead to provincial and national recognition (Pradervand & Govender 2003;Pradervand 2004;Pradervand et al 2007). Certain biases existed in catch return cards and competitions (Mann-Lang 1996;Maggs et al 2012a).…”

Section: Data Sourcesmentioning

confidence: 99%

Traditional management strategies fail to arrest a decline in the catch‐per‐unit‐effort of an iconic marine recreational fishery species with evidence of hyperstability

Maggs

Mann

Potts

et al. 2015

Fisheries Management Eco

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The paucity of long‐term marine recreational fisheries data limits understanding of the effects of exploitation on target species. Long‐term catch‐per‐unit‐effort (CPUE) datasets for a large piscivorous carangid species, Lichia amia (L.), from 3 South African recreational fishery sectors were examined. Although standardised CPUE for all sectors showed an overall long‐term decline, there was considerable variability in trends between the recreational sectors and between datasets. Contrasting trends between competitive shore angling and general shore angling datasets were ascribed to hyperstability in competition CPUE data, which was most influenced by rapidly improving technology, techniques and communication networks amongst anglers. Month and locality were significant factors explaining the probability of catching L. amia. This suggests that the predictable aggregation behaviour of this species could further compound the observed CPUE hyperstability. Although the CPUE responded positively for 6 years after implementation of the first minimum size and bag limits, and for 1 year after the decommercialisation of the species, these regulations and their amendments failed to arrest a long‐term decline in CPUE despite ample evidence for hyperstability. Additional regulations, including a spatio‐temporal closure and the implementation of a voluntary regulation framework of catch and release, are recommended for this species.

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Long-term trends in the competitive shore fishery along the KwaZulu-Natal coast, South Africa

Cited by 21 publications

References 1 publication

Patterns and ecosystem consequences of shark declines in the ocean

Patterns and ecosystem consequences of shark declines in the ocean

Biological and socio‐economic aspects of recreational fisheries and their implications for the management of coastal urban areas of south‐eastern Brazil

Traditional management strategies fail to arrest a decline in the catch‐per‐unit‐effort of an iconic marine recreational fishery species with evidence of hyperstability

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