Metschnikowiella zobellii sp.nov. and M. krissii sp.nov., two yeasts from the Pacific Ocean pathogenic for Daphnia magna.

Calcareous sponges of Indonesia.

The calcareous sponges collected during Indonesian-Dutch research projects, incorporated in the collections of the Naturalis Biodiversity Center (formerly the Rijksmuseum van Natuurlijke Historie and the Zoölogisch Museum of the University of Amsterdam), are described and discussed. A total of 37 species were distinguished, of which 16 are new to science, while several others are very poorly kn...

Two new species of Chondrocladia (Demospongiae: Cladorhizidae) with a new spicule type from the deep south Pacific, and a discussion of the genus Meliiderma

Two new species of Chondrocladia are described from the deep Pacific, off New Zealand and South Australia. These presumably carnivorous sponges are characterized by the presence of a sheath of special spicules along the stalk, for which the new term ‘trochirhabd’ is coined. Similar spicules were known from fossil strata of the Early Jurassic, suggesting that Cladorhizidae were already present i...

Growth and feeding performance of Rainbow trout (Oncorhynchus mykiss) alevin fed on diet contained fermented Daphnia magna with Bacillus probiotics

This study was carried out to evaluate the effects of different levels of fermented daphnia (Daphnia magna) as a partial protein source of rainbow trout (Oncorhynchus mykiss) alevins’ diet and its effect on growth; nutrition and feed efficiency for 8 weeks. Rainbow trout alevins with an initial body weight of 0.583 ± 0.197g (Mean ± SD) after acclimating to study condition were fed in 5 treatmen...

Short communication-Survey of Methyl Tertiary Butyl Ether (MTBE) toxicity using bioassay on Daphnia magna

Evaluation of silver nanoparticles toxicity in Daphnia magna: Comparison of chemical and green biosynthetic productions

Recently nanoparticles, particularly silver nanoparticles, are broadly used in industry, hence the contamination of the environment with AgNPs has caused considerable concern. In this study, the toxicity of biosynthetic nanosilver produced by two macroalgae: Sargassum boveanum and Ulva flexuosa extracts were compared with chemical nanosilver in Daphnia magna. Size and quality of nanoparticles e...