DOLPHIN-FISHERY INTERACTION: COST-BENEFIT, SOCIAL-ECONOMIC AND CULTURAL CONSIDERATIONS - Biology, Evolution and Conservation of River Dolphins Within South America and Asia - page 237

Chapter 12
D OLPHIN -F ISHERY I NTERACTION : C OST -B ENEFIT ,
S OCIAL -E CONOMIC AND
C ULTURAL C ONSIDERATIONS
Sandra Beltran-Pedreros 1  , and
Ligia Amaral Filgueiras-Henriques 2 +
1 Projeto PIATAM. Área de Mamíferos Aquáticos. INPA (CPBA)-UFAM. Rua
Ajuricaba, Aleixo. Manaus, Brazil
2 Universidade do Estado do Pará (UEPA, Departamento de Ciências Naturais - Rua do
Una, Telégrafo - Belém, PA. Brazil.
A BSTRACT
We evaluated dolphin-fishery interaction dynamics as well as the social-economic
and cultural aspects of this relationship on the artisan fleet of the city of Vigia (Para) that
fished with gill nets in the Amazon estuary from 1996 to 2001. Simple regression
analyses were used to define the fishing-effort components (fishing-power and time) and
to correlate fishing-effort and dolphin bycatch. Economical system and fish marketing
dynamics analyses were used to define the interaction cost-benefit. The fishing-effort unit
was FN x Hr and, the correlation between it and the dolphin bycatch was low, decreasing
in the second period of this study. The trade of whole dolphins or their parts does not
represent an important revenue factor for the fishermen and therefore should not be
considered dangerous to the dolphin population. A new model of relationships among the
variables of the fishery-dolphin system is presented.
Keywords: Dolphin-fishery relationships, bycatch, Amazon Estuary, Artisan fishing.
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