For the present study, growth and survival of 30 juvenile axolotls Ambystoma mexicanum species fed with a probiotic were evaluated. At beginning investigation, specimens had an average size weight 4 ± 0.5 (cm) 2 0.3 (g) respectively. Throughout study organisms kept in six aquariums 40 L fresh water, at temperature 15 1 °C, natural photoperiod 5 each. The for 24 weeks Tubifex tubifex slimeworm i...

The super-phylum Lophotrochozoa contains the plurality of extant animal phyla and exhibits a corresponding diversity of adult body plans. Moreover, in contrast to Ecdysozoa and Deuterostomia, most lophotrochozoans exhibit a conserved pattern of stereotyped early divisions called spiral cleavage. In particular, bilateral mesoderm in most lophotrochozoan species arises from the progeny of microme...

Annelids are strongly segmented animals that display a high degree of metamerism in their body plan. The embryonic origin of metameric segmentation was examined in an oligochaete annelid Tubifex using lineage tracers. Segmental organization arises sequentially in the anterior-to-posterior direction along the longitudinal axis of the mesodermal germ band, a coherent column of primary blast cells...

A wide range of human pharmaceuticals are present at low concentrations in freshwater systems, particularly in sections of polluted river. These compounds show high biological activity, often associated with a high stability. These characteristics imply a potential impact of these substances on aquatic biota even when present at low environmental concentrations. Low flow conditions in Mediterra...

Effect of food was examined on the budding rate and the developmental gradients of a mutant hydra strain L4. This mutant strain has very high levels of head-inhibition potential gradient along its body axis (Takano & Sugiyama, 1983). It also has a reduced budding capacity when it is cultured using brine shrimp nauplii as food, but its budding capacity is significantly improved when a small amou...

In this study, we investigated the distribution of polychlorinated biphenyls (PCBs) in a riparian zone affected by the effluent from a wastewater treatment plant (WWTP). River water, sediment, aquatic invertebrates and samples from the surrounding terrestrial compartment such as soil, reed plants and several land based invertebrates were collected. A relatively narrow range of δ(13)C values was...

Oligochaeta of forest vernal pools and small draining ditches were sampled together with other aquatic macroinvertebrates yearly in spring 2013–2018 at six sites the eastern part Tartu County, Estonia. In 298 samples, a limited number oligochaete taxa (23) was found. The most common species Lumbriculus variegatus (2/3 all individuals sampled), Cognettia glandulosa, Tubifex tubifex Aulodrilus li...