Formalin is effective as a bath treatment for most protozoan external parasites and monogenetic trematodes. Formalin bath treatments are of little use for treatment of external bacterial or fungal infections. Formalin is algicidal, but is not applied for algae control.
Formalin is solution of 37% formaldehyde, but for dosage calculations in the treatment of fish parasites formalin solution is considered as 100% active. Formalin solution is soluble in both fresh and marine water.
The toxicity of formalin to fish increases with temperatures above 22oC, thus dosage for a one hour bath exposure should not exceed 167 ppm. Higher dosages up to 250 ppm may be attempted, but caution is advised and reduced exposure (30 to 45 minutes) times are indicated.
Formalin removes oxygen from the water at the rate of 1 ppm O2 for each 5 ppm formalin applied. Thus, adequate aeration should be used when formalin treatment is applied. In addition, during treatment with formalin fish should be evaluated every few minutes for signs of respiratory distress (gasping at the surface, forced heavy respiration, etc.) and if present, the formalin solution should be flushed out immediately.
Formalin is a clear solution. Prolonged storage, exposure to direct sunlight or temperature below 5oC of formalin results in the formation of paraformaldehyde. Paraformaldehyde is highly toxic to aquatic life. Thus, formalin that appears cloudy, has a white precipitate on the bottom of the container (to visualize swirl the bottle to suspend the precipitate) or has been in storage for a prolonged period should not be used for treatment of fish.
Formalin is approved by the FDA for use in food fish. However, this approval applies only to specific brands of formalin solution. Be sure the formalin used for treatment of fish parasites is an approved form (ie. Paracide F from Argent Laboratories).
Formalin is a liquid solution that is 37% formaldehyde by weight , but for purposes of external parasite treatment of fish is considered 100% active chemical. Certain commercial preparations of formalin have been approved by the FDA for use with food fish.
The user is advised to only use an approved formalin solution for treatment of parasites on fish intended for human consumption.
Warning: It is dangerous to apply formalin to fish with gill disease and it is necessary to have air addition and continuous monitoring of the fish during Rx.
Suggestion: Formalin should be stored at room temperature, and the formalin for fish disease treatment should not be stored longer then one year.
|file: /Techref/other/pond/tilapia/formalin.htm, 5KB, , updated: 2007/2/5 19:20, local time: 2018/2/24 04:22,
|©2018 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?|
<A HREF="http://www.piclist.com/techref/other/pond/tilapia/formalin.htm"> Formalin</A>
|Did you find what you needed?|
PICList 2018 contributors:
o List host: MIT, Site host massmind.org, Top posters @20180224 RussellMc, Sean Breheny, Van Horn, David, David C Brown, Isaac M. Bavaresco, Darron Black, Harold Hallikainen, alan.b.pearce, Bob Blick, Brent Brown,
* Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.
Welcome to www.piclist.com!