New insights into the reproduction and migration of the porbeagle shark Lamna nasus (Bonnaterre 1788) in the Southwest Atlantic Ocean.

The objective of this study was to estimate the reproductive parameters of porbeagle shark in the Southwest Atlantic Ocean and thus characterize the adult fraction of this population. Therefore, 1012 specimens were measured by scientific observers on board the commercial trawl fleet operating south of 50° S. The size range of the specimens was from 77 to 292 cm fork length (LF). The mean size at maturity was estimated to be 153 cm LF for males and 172 cm LF for females. Porbeagle shark catches were recorded throughout the year, with the highest frequency occurring between November and June. The presence of pregnant females was observed from December to July, along with an increase in the average size of embryos in each litter. The information presented in this study improves the knowledge of the reproductive biology and allows to propose a migratory pattern of adult porbeagle females in the Southwest Atlantic Ocean. The likely seasonal increase in vulnerability of this shark to austral trawl fishery, despite all conservation management measures established in Argentina, underscores the importance of promoting its proper management and conservation given the need to improve understanding of porbeagle population dynamics in the Southern Hemisphere.

New species records of Gasteruptiidae (Hymenoptera, Evanioidea) from Eastern Uruguay.

In this study, the Gasteruptiidae (Hymenoptera, Evanioidea) collected in three environments at the Department of Rocha, in Eastern Uruguay, were documented based on a survey carried out with Malaise traps between December 2014 and December 2016. During the samplings, four species of Gasteruption Latreille, 1796 were captured, being 14 females and three males of Gasteruption brachychaetun Schrottky, 1906; eight females and five males of Gasteruption brasiliense (Blanchard, 1840); one female of Gasteruption helenae Macedo, 2011 and one female of Gasteruption brandaoi Macedo, 2011. Gasteruption brachychaetun, G. helenae and G. brandaoi are recorded by the first time from Uruguay.