This study examined the direct effects of tricaine methanesulfonate (MS-222), a sodium-channel blocking local anesthetic, on respiratory motor output using an in vitro brain stem preparation of adult North American bullfrogs (Rana catesbeiana). Bullfrogs were anesthetized with halothane, and the brain stem was removed and superfused with artificial cerebrospinal fluid containing MS-222 at conce...

The design of anesthetic protocols for frogs is commonly hindered by lack of information. Results from fishes and rodents do not always apply to frogs, and the literature in anurans is concentrated on a few species. We report on the response of treefrogs (Hyla chrysoscelis and H. versicolor) to tricaine methanesulfonate. Body mass did not differ significantly between the species or between sexe...

the effects of three  anesthetics, clove oil (co) ( 30 mgl-1), 2-phenoxy ethanol (2-pe) (0.3 mll-1), and ms-222 (100 mgl-1) were examined on blood enzymes including lactate dehydrogenase (ldh), creatine kinase (ck), alanine aminotransferase (alt), aspartate aminotransferase (ast), albumin, glucose, and cortisol levels in the caspian brown trout. blood parameters were evaluated in the control (n...

Anesthesia is known to affect the auditory brainstem response (ABR) in mice, rats, birds and lizards. The present study investigated how the level of anesthesia affects ABR recordings in an amphibian species, Babina daunchina. To do this, we compared ABRs evoked by tone pip stimuli recorded from 35 frogs when Tricaine methane sulphonate (MS-222) anesthetic immersion times varied from 0, 5 and 1...

Frogs possess pain receptors and pathways that support processing and perception of noxious stimuli however the level of organization is less well structured compared to mammals. It was long believed that the experience of pain was limited to 'higher' phylums of the animal kingdom. However, it is now commonly accepted that amphibians possess neuro-anatomical pathways conductive of a complete no...

The Mexican axolotl (Ambystoma mexicanum) is an important model species in regenerative biology. Traditionally, axolotls are anesthetized using benzocaine or MS-222, both of which act to inhibit voltage gated sodium channels thereby preventing action potential propagation. In some neurophysiological experiments this is not desirable; therefore we tested propofol as an alternative anesthetic in ...

Anesthetics are drugs that reversibly relieve pain, decrease body movements and suppress neuronal activity. Most drugs only cover one of these effects; for instance, analgesics relieve pain but fail to block primary fiber responses to noxious stimuli. Alternately, paralytic drugs block synaptic transmission at neuromuscular junctions, thereby effectively paralyzing skeletal muscles. Thus, both ...

This study evaluated the effect of different concentrations (20, 40 and 60 mg/L) 3-aminobenzoic acid ethyl ester methanesulfonate (MS-222) on quality changes in turbot during simulated transport water. The results showed that ammonia nitrogen content transportation water each sample increased significantly, dissolved oxygen level decreased. MS-222-treated samples was higher than control group (...

Su ürünleri yetiştiriciliğinde 2-fenoksietanol, MS-222 ve benzokain gibi sentetik anestetikler yaygın olarak kullanılmaktadır. Amerika İngiltere'de yemeklik balıklarda kullanılmasına yasal izin verilen tek anestetik madde MS-222’dir. İlaç Gıda Örgütü (FDA) tarafından MS-222’nin balık vücudundan atılma süresi su sıcaklığına göre farklılık göstermekle birlikte ortalama 21 gün belirtilmiştir. Bu d...