Produção Nacional
Revisado por pares
Parâmetros populacionais de poecilíneo em riachos Sul-Mato-Grossenses, Brasil
2014; INSTITUTO DE PESCA - APTA - SEC. DE AGR. E ABAST. - SP; Volume: 40; Issue: 4 Linguagem: Inglês
ISSN
1678-2305
AutoresAngélica Mendonça, Milza Celi Fedatto Abelha, Valéria Flávia Batista da Silva, Elaine Antoniassi Luiz Kashiwaqui, Dayani Bailly, Carlos Alexandre Molena Fernandes,
Tópico(s)Aquaculture Nutrition and Growth
ResumoThis study aimed to describe and compare the population structure of Phalloceros harpagos in Perobao and Agua Boa streams, Mato Grosso do Sul State, through quantitative population parameters. Samplings were conducted using electrofishing in the streams´ upper, intermediate and lower stretches (sites 1, 2 and 3, respectively), between March and November 2008. Standard length, weight and sex were used to determine the sex ratio, standard length classes’ frequency and populations’ condition at each stream. A total of 686 and 3,404 specimens of P. harpagos were captured at Agua Boa and Perobao streams, respectively. Only the population of the upper stretch of the Agua Boa Stream was considered in the analysis due to the inexpressive capture in intermediate and lower stretches. Males with 1.4-1.8 and 1.8-2.2 cm standard length were the most captured in both streams. Females reached greater lengths, and the most frequent were those with 2.2-2.6 and 1.8-2.2 cm in the Agua Boa and Perobao, respectively. Females predominated significantly (2.5:1) in the Agua Boa Stream and at Site 1 (1.3:1) of Perobao Stream. The sex ratio was the same in all other sites. The Kolmogorov-Smirnov test indicated significant difference in the distribution of individuals within size classes for both streams. The application of covariance analysis or of the separate slope model on data from the linearization of the length-weight relationship indicated the best condition of the P. harpagos population in Agua Boa Stream and of that present in the upper stretch of Perobao Stream.
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