O escorpião amarelo Tityus serrulatus é registrado pela primeira vez para oeste do Rio Grande do Sul. Foram coletados dois espécimes no município de Uruguaiana (29° 45' 23'' S e 57° 05' 37'' W) em junho de 2006. A ocorrência dos espécimes de T. serrulatus no Rio Grande Sul representa um aumento de 2.127 km em sua área de distribuição conhecida.

The yellow scorpion Tityus serrulatus is recorded for the first time for the western Rio Grande do Sul State, Brazil. Two specimens were collected in the municipality of Uruguaiana (29° 45' 23'' S and 57° 05' 37'' W) in june 2006. The occurrence of specimens of T. serrulatus in Rio Grande do Sul represents an increase of 2127km in relation to his known distribution area.

The recruitment period of Locariichthys platymetopon (Isbrucker & Nijssen, 1979) was investigated. It has been found out, through the data analysis, that the gonadal condition factor is a good indicator of the reproductive period and that the hepatossomatic index is probably related to the storage of reservation for the winter period. The recruitment occurred in November coinciding with the reproductive activity of May.