Histological and hematological alterations of silver catfish Rhamdia quelen highly parasitized by Lernaea cyprinacea.

The main objective of this study was to evaluate the histological and hematological alterations of silver catfish Rhamdia quelen (Quoy & Gaimard, 1824) against intense parasitism by anchor worm Lernaea cyprinacea Linnaeus, 1758. Thirteen fish specimens were collected at the Fish Genetic Improvement Unit (EPAGRI/CEDAP), Brazil. After acclimatization, the fish were anesthetized for blood collection, and the samples were used for counting thrombocytes, total leukocytes, differential leukocytes and for quantification of total erythrocytes.

Toxicity of formalin for fingerlings of var. and in vitro efficacy against Kulwièc, 1927 (Monogenea: Dactylogyridae).

The toxicity of formalin on var. and its anti-parasite effects against (Monogenea) in in vitro tests is analyzed. Specimens of were submitted to eight concentrations of formalin: 50, 75, 100, 125, 150, 175, 200, 250 mg L, in triplicate.

The evolutionarily conserved role of melatonin in CNS disorders and behavioral regulation: Translational lessons from zebrafish.

Melatonin is an important hormone regulating circadian rhythm, neuroprotection and neuroimmune processes. However, its exact physiological roles in brain mechanisms remain poorly understood. Here, we summarize the mounting evidence implicating melatonin in brain disorders and behavior, based on clinical and experimental studies in-vivo.

Effects of lidocaine on adult zebrafish behavior and brain acetylcholinesterase following peripheral and systemic administration.

Lidocaine is a voltage-gated Na channel blocker, commonly used as a fast-acting local and general anesthetic. Lidocaine also has central action, affecting behavior both clinically and in animal models. Adult zebrafish are rapidly becoming a critical novel model organism in translational neuroscience research.

Tadpoles fed supplemented diet with probiotic bacterium isolated from the intestinal tract of bullfrog Lithobates catesbeianus: Haematology, cell activity and electron microscopy.

The aim of this study is to select and isolate autochthonous bacteria with probiotic potential for use in a supplemented diet for bullfrog tadpoles, Lithobates catesbeianus. A total of 20 strains of lactic acid bacteria were isolated. Nine out of these were used in the following in vitro assays: antagonism against pathogenic bacteria (ANT), antimicrobial activity from extracellular compounds (MIC), tolerance to bile salts (TBS), pH reduction, protease production, sensitivity to antimicrobial tetracycline, cell viability, growth rate and doubling time.