부산대학교 도서관

Pacu fi sh (Cuvier, 1818) (Characiformes: Characidae) landed in Porto Velho (Rondônia) fi sh market from 1985 to 2004. This study evaluated various aspects of the profi le of pacu (Mylossoma spp., Myleus spp., Metynnis spp.) fi sh marketed on the Cai N’água fl oating platform of Porto Velho (RO) from 1985 to 2004. Inter- and intra-annual variations in yield, variation in fi sh length and general characteristics of the fi shing are reported. The annual pacu yield ranged from 33,000kg to 146,000kg (average = 86,585kg), representing from 6.6% to 20.45% of the total landings in the studied period. These variations followed the hydrologic cycle, and the greatest yields were recorded in the years following the highest water levels. The monthly production ranged from 0 to 42,366kg (average = 5,772kg) and it was related to reproductive migration. The pacu presented variations in standard length from 14 to 20cm (18.72cm ± 3.69, mean ± sd). The fi shing was based on the use of seines and gill nets and the main environments of capture were tributaries of the low Madeira River (Jamari, Oropiara, Machado and Novo Aripuanã). The CPUE calculated for 2003 to 2005 was 15kg*fi sherman-1day-1 (sd = ±21). The results show that the category constituted during this period an important resource for local commercial exploitations, as verifi ed in other regions of the Amazon.