Effect of stocking density on the behavior of newly transformed juvenile Macrobrachium rosenbergii

This study characterized the behavioral activity of Macrobrachium rosenbergii in the early stages of development, under different stocking densities (25 and 40 animals/m²), and during the light and dark phases of a 24-h cycle. Observations of individuals were made in 8 aquariums. Behavioral recording lasted 15 min/aquarium, 4 times/day and 4 days/week, 4 weeks in total. Food was offered twice daily. Observational methods included a combination of behavioral sampling and scan sampling. During the light phase, inactivity, cleaning and remaining in a shelter were the most frequent behaviors. During the dark phase the subjects displayed a higher frequency of feeding, exploration, swimming, and digging. At low density, the animals gained more weight and exhibited greater growth overall. These results indicate a behavioral pattern that is more favorable to animals in the lower density cultivation environment that can also create better living conditions for these shrimp, favor survival rates and therefore improve management success.     

Die österreichisch-ungarischen Standorte der„Potentillae exsiccatae“ von H. Siegfried in Winterthur

Ohne Zusammenfassung     

Entwicklungsmechanische studien

Ohne Zusammenfassung Mit 22 Textabbildungen Nessuna humana investigazione si puo dimandare vera scientia s'essa non passa per le matematiche dimostrazioni. Ich behaupte, da? in jeder Naturlehre nur soviel wahre Wissenschaft ist, als Mathematik im weiteren Sinne darin enthalten ist.     

Kulturversuche mit Flechtenpilzen (Xanthoria parietina)

Ohne Zusammenfassung     

Über die lichte Weite der Placentararterien

Ohne Zusammenfassung