Abstract
The species Prochilodus lineatus, with great commercial relevance in the rivers Grande, Pardo and Mogi-Guacu, is characterized by the formation of great shoals which are capable of developing wide migratory displacements. Current assay evaluates, by means of the morphometric characteristics and age, whether the curimbatas (P. lineatus) of different migratory and resident stocks form a single population, with interactivities among the sub-populations during the 'piracema' period (reproduction migration). A completely randomized plot with a 4 x 2 factorial scheme, with four stocks (one resident and three migratory) as factors and two genders (male and female), with thirty replicates, was employed, with each fish taken as an experimental unit. An 80.19% variation for the first principal component and an 8.09% variation for the second principal component were reported as provided by the ten morphometric variables of resident and migratory stocks. The resident stock had the highest rate for the whole morphometric variables. There was superposition of individual scores of the same characteristics among the migratory stocks. Significant predominance of males was observed among resident stocks and migratory stocks I and II. Morphometric similarity verified among the migratory stocks showed a single population, with small inter-population variations.
Highlights
Reproduction of the rheophile species Prochilodus lineatus (Valenciennes, 1836) occurs in river channels and its initial development takes place in marginal lakes close to floodplains
Thirty specimens of Prochilodus lineatus (Valenciennes, 1836), were captured in September 2006 from the resident stock, or rather, the stock which remained during the whole year, in the river Mogi-Guaçu (Alto Paraná basin), in the Cachoeira de Emas Dam, municipality of Pirassununga, São Paulo State, Brazil
Analysis of Principal Components was undertaken to verify general standards in the use of environmental resources based on the body shape of P. lineatus
Summary
Reproduction of the rheophile species Prochilodus lineatus (Valenciennes, 1836) occurs in river channels and its initial development takes place in marginal lakes close to floodplains. Fish stocks for commerce or sports normally reveal high impaired size and age distributions with no bigger and/or older specimens. This is due to the fact that fishermen retrieve the biggest specimens and to fishing regulations that, as a rule, impose a single minimum fish size or fishing tackle that ensure a selective harvesting of the Maringá, v. Through morphometric and age characteristics, whether the P. lineatus of the river Mogi-Guaçu, from different migratory and resident stocks, form one population, with interactivities among the subpopulation during the ‘piracema’ (reproduction migration) period
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