Book: Biology of Stress In Fish – Fish Physiology (Chapter 12 – Stress Management And Welfare)

Book: Biology of Stress In Fish – Fish Physiology (Chapter 12 – Stress Management And Welfare)

Lynne U Sneddon, David C.C. Wolfenden, Jack S Thomson
Biology of Stress in Fish – Fish Physiology, pp.463-539

The Chapter 12 authors have posted their work on Research Gate here:

DOI: 10.1016/B978-0-12-802728-8.00012-6 (Science Direct)

There is not only a lack of familiarity with what constitutes stress and what side-effects stress can have, but there’s even a pretty fair amount of denial of it’s role in health and sickness.  All of that is laid fairly to rest in this book.

For example from this chapter, we can learn:

  • Short term (acute) stress – like being caught in a net – isn’t so bad for a fish.  It’s just a coping mechanism and long term consequences would not be expected.
  • Long term (chronic) stress – like three months in QT with a pack of strange fish – will have a more lasting negative impact on growth, immunity and reproduction.

In spite of how much of the book is online, they don’t allow quoting from any of it from any source I’ve found, so you can read the rest for yourself!

Microbial Community Management in Aquaculture

Microbial Community Management in Aquaculture

Procedia Food Science, Volume 6, 2016, Pages 37-39
P. Bossier, P. De Schrijver, T. Defoirdt, H.A.D. Ruwandeepika, F. Natrah, J. Ekasari, H. Toi, D. Nhan, N. Tinh, G. Pande, I. Karunasagar, G. Van Stappen

Under a Creative Commons license

The expansion of the aquaculture production is restricted due to the pressure it causes on the environment by the discharge of waste products in the water bodies and by its dependence on fish oil and fishmeal. Aquaculture using bio-floc technology (BFT) offers a solution to both problems.

All biofloc size classes were consumed and utilized by the shrimp, tilapia and mussel. The highest retention of nitrogen in the animal body, however, was consistently originating from the bioflocs larger than 100μm

Survival in the [immunity] challenge tests with shrimp from the biofloc [fed] groups, was also significantly higher compared to the positive control.

Rather than trying to control microbial community composition, microbial activity can be steered. The disruption of quorum sensing, bacterial cell-to-cell communication, has been suggested as an alternative strategy to control infections in aquaculture 5.

Recent studies also indicate that opportunistic aquatic pathogens[…]are also able to sense host clues such as stress hormones.


Lactic acid bacteria vs. pathogens in the gastrointestinal tract of fish: A review

Lactic acid bacteria vs. pathogens in the gastrointestinal tract of fish: A review

Article (PDF Available)inAquaculture Research 41(4):451 – 467 · March 2010with359 Reads
DOI: 10.1111/j.1365-2109.2009.02339.x
Einar Ringø, Lisbeth Løvmo, Mads Kristiansen, Yvonne Bakken, Terry M Mayhew

…before any infection can be established, pathogens must penetrate the primary barrier. In fish, the three major routes of infection are the skin, gills and gastrointestinal (GI) tract. The GI tract is essentially a muscular tube lined by a mucous membrane of columnar epithelial cells that exhibit a regional variation in structure and function. In the last two decades, our understanding of the endocytosis and translocation of bacteria across this mucosa, and the sorts of cell damage caused by pathogenic bacteria, has increased.

When discussing cellular damage in the GI tract of fish caused by pathogenic bacteria, several important questions arise including: (1) Do different pathogenic bacteria use different mechanisms to infect the gut? (2) Does the gradual development of the GI tract from larva to adult affect infection? (3) Are there different infection patterns between different fish species? The present article addresses these and other questions.

Lots of folks have trouble keeping their fish alive due to pathogenic activity….probiotics (especially live food items) can help!