Pesca e esforço de pesca no Estado do Amazonas. II - Locais, aparelhos de captura e estatísticas de desembarque

Petrere, Miguel

doi:10.1590/1809-439219780832s005

Cited by 45 publications

(43 citation statements)

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“…There were no major changes in the species composition of fish caught by fishermen between the high and low water periods, in contrast to the pattern observed in the diet of giant otters. Despite the availability of various techniques and fishing gear, the gillnet, which is a low‐selectivity fishing gear, is the most frequently used by riverine fishermen (Petrere , Batista et al . , Crampton et al .…”

Section: Discussionmentioning

confidence: 99%

Conflict between Fishermen and Giant Otters Pteronura brasiliensis in Western Brazilian Amazon

2011

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The recovery of giant otter populations after the hunting prohibition and restriction of the pelt trade resulted in more frequent conflicts with fishermen. In this study, fisherman–giant otter conflicts were analyzed in the Uacari Sustainable Development Reserve, where giant otters are accused of interfering with fisheries by eating the fish (predation), frightening the fish away (local interference), and damaging fishing equipment (direct interference). Interference by predation was analyzed by evaluating overlap in fish species consumption between humans (measured by subsistence and commercial catches) and giant otters. The giant otter diet was assessed from fecal samples, and the human diet through questionnaires. Local and direct interferences were analyzed through fish samples using gillnets and comparing capture efficiency with and without giant otters’ presence. The overlap between human and giant otter diets was low (0.37), varied seasonally, and was smaller in the low water (0.24) than in the high water period (0.60), when both species tend to be more generalists. Overlap between fish species consumed by giant otters and those exploited by commercial fisheries was small (0.34). Giant otter presence during the experimental fishing was low (9.5%), restricted to the high water period, and did not significantly reduce the captures (U = 13, P = 0.61). The low overlap in diet may be a result of differences in preferences and fishing strategies. The conflict between giant otters and fishermen is greater in the high water period, when the income of the fisheries decreases; however, the conflict seems to be mainly motivated by the resident's prejudice against giant otters.

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Section: Discussionmentioning

confidence: 99%

Conflict between Fishermen and Giant Otters Pteronura brasiliensis in Western Brazilian Amazon

2011

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“…Throughout the world, fishing fleets are becoming progressively larger in scale and fish stocks are becoming seriously depleted. To avoid decreasing local abundance, vessels from the state of Amazonas State are travelling farther from their homeports (Petrere 1978b). The increase of fishing power, together with the reduction in the number of boats and fishermen, can be interpreted as a strategy to optimise income through an increase in scale aimed at selling catches to export‐oriented processing plants, which have a more stable demand.…”

Section: Discussionmentioning

confidence: 99%

“…Information on Brazilian fishing activities was traditionally based on data collected by the government, assessing low‐quality catch and effort data. In the case of the Amazon fisheries, such information does not exist and only a few interrupted data sets are available for some locations (Petrere 1978a,b; Goulding 1979; Smith 1979; Isaac & Ruffino 2000b; Batista 2003, 2004; Batista & Petrere 2003; Barthem 2004). The lack of knowledge on the Amazon fisheries stems from the nature of the activity, which is on a small scale but dispersed over a large area.…”

Section: Introductionmentioning

confidence: 99%

The artisanal fishery fleet of the lower Amazon

Isaac¹,

Silva²,

Ruffino³

2008

Fisheries Management Eco

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The present study analyses temporal trends in the characteristics of the artisanal fleet landing at ports in the city of Santare´m (lower Amazon) from 1993 to 2003. A total of 2714 boats visited the city, accounting for more than 76 000 landings. Of these, 1952 were fishing boats; the others were buyer boats, specialised in the purchase of fish in rural areas for resale in Santare´m. The activity involves more than 13 000 fishermen. Fishing boats are made of wood, are on average 11 m long and powered by a 20 hp outboard motor. Boats operate with an average of six to seven fishermen, spending 6 days per trip and catching between 300 and 800 kg of fish. Most variability in yield can be explained by the ice consumed (70%), the number of fishermen trip )1 (19%), fuel consumed (4%) and days spent fishing (3%). The yield changed according to the size, origin and type of boat. Fishing boats coming from more distant locations, in the state of Amazonas, performed better than those from Santare´m. Total yield declined slightly during the study period. Mean age of fishing boats and fishing power is increasing. Consumption of ice and fuel by trip, number of fishermen trip )1 and mean days fishing showed positive trends. Financial subsidies from governmental agencies are criticised. Fleet performance and management options are discussed. K E Y W O R D S :Brazil, effort, management, production, subsidies, yield.

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“…Integration, however, requires communication; representatives of monitoring programs should meet in a regular forum to review findings, aims, and methodologies. Apart from the three programs cited above, a number of other successful studies could provide useful contributions (Petrere Jr. 1978, Castello 2004). We cannot cite all such studies, but one valuable outcome of a forum could be a publicly available, internet‐based information system to assess the scope and limits of existing monitoring programs.…”

Section: Efficient Design—one Scale At a Timementioning

confidence: 99%