Did you read Paul's thread on slime that I linked? I'm pretty sure he has some sources on there. You've said a couple times now, in a round about way, that slime can't kill pathogens. It can.
I actually did post some links about this because contrary to popular opinion of just about everyone, I don't make this stuff up as I go along. OK, most of the time I do but being I amnot a scientist, but an electrician with an active imagination I did do plenty of research before I embarked on a subject that I realized the vast majority of people on here do not believe. Here is part of that I discovered but there is an enormous amount of new findings on the immunity of fish especially their skin.
If you are in a reading mood, you can find a lot of it here https://www.hindawi.com/journals/isrn/2012/853470/abs/
Quote:
ISRN Immunology
Volume 2012 (2012), Article ID 853470, 29 pages
http://dx.doi.org/10.5402/2012/853470
Review Article
An Overview of the Immunological Defenses in Fish Skin
María Ángeles Esteban
Fish Innate Immune System Group, Department of Cell Biology and Histology, Faculty of Biology, University of Murcia, Regional Campus of International Excellence “Campus Mare Nostrum”, 30100 Murcia, Spain
Received 26 August 2012; Accepted 12 September 2012
Academic Editors: A. Bensussan, E. Flaño, J. D. Hayball, and P. Puccetti
Copyright © 2012 María Ángeles Esteban. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The vertebrate immune system is comprised of numerous distinct and interdependent components. Every component has its own inherent protective value, and the final combination of them is likely to be related to an animal’s immunological history and evolutionary development. Vertebrate immune system consists of both systemic and mucosal immune compartments, but it is the mucosal immune system which protects the body from the first encounter of pathogens. According to anatomical location, the mucosa-associated lymphoid tissue, in teleost fish is subdivided into gut-, skin-, and gill-associated lymphoid tissue and most available studies focus on gut. The purpose of this paper is to summarise the current knowledge of the immunological defences present in skin mucosa as a very important part of the fish immune system, serving as an anatomical and physiological barrier against external hazards. Interest in defence mechanism of fish arises from a need to develop health management tools to support a growing finfish aquaculture industry, while at the same time addressing questions concerning origins and evolution of immunity in vertebrates. Increased knowledge of fish mucosal immune system will facilitate the development of novel vaccination strategies in fish.