Biology Reference
In-Depth Information
Fishing Fleet
Time and distance of the fishery divide the Vigia artisan fleet in two. One fleet of "arrives
and turns", is based in the Municipality port, and consists of smaller, 12 meter long boats that
use hooks, lines and monofilament nets. It supplies the fish market of the city and is operated
by fishermen from Vigia or from communities of the interior of the State of Pará. And, fleet
two, of "outside fishermen", is based in the Arapiranga port, and contains boats larger or
smaller than 12 (this is different than the author's first chapter where the fleets were clearly
divided into two groups, one with vessels larger than 12 meters and second group with
vessels shorter than 12 meters long.) meters long and that depend on multifilament nets.
Many of these fishermen are from cities such as Bragança, Salinas and Boa Vista. All the
vessels of this port were sampled because dolphins are accidently caught here more than any
other location.
Fishing Fleet Characterization
The fishing power was selected from the best correlation among the boat length (BL)
with the variables: ice capacity of the basement (IC), motor power (HP), net length (NL) and
fishermen number (FN). Hours were set as the time unit (Hr), which was equivalent to the
throwing number (TN) times 5 (average time the net was in the water). The fishing effort was
calculated as the product of the fishing power units and time.
Interaction Dolphin-Fishery
The correlation between accidental capture and fishing effort was used as an interaction
dolphin-fishery parameter. The analyses were completed for each phase of the research,
separated and compared among fishing strata.
Socio-Economic Considerations
The socioeconomic and cultural aspects of the dolphin-fishery interaction were
investigated while the fish trade and employment contracts, among the members of a fishing
unit, were verified. When there was a dolphin accidentally captured the fishermen were asked
the intended destination of the animal. If a dolphin or its parts were to be sold, the fishermen
were also asked, which parts and for what prices? Finally, we made a cost-benefit evaluation
based on the price of the fish market, the fish number that would occupy the equivalent
volume of a dolphin, the capacity of the boat basement and the prices obtained by the sale of
dolphins or parts of them.
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