Fish farms and the function of glucose… (Day 170)

Fish Farm production fish farming systems

Today’s Diary Entry is sponsored by Pet Webinars

This week the bee’s lecture was cancelled so this morning I got a little extra time to work on my Emergency First Aid for Animals book which was pretty cool and is coming along nicely. I didn’t make my goal however will also be selling the electronic version of the book through this website very shortly, in the meantime you can get it here: http://www.indiegogo.com/a-lifetime-helping-animals-vet-student/x/811619.

Anyways this week we still had a diseases of fish lecture looking at fish production systems (very cool!) and the problems associated with this. The common misconception here is that fish farming is just putting some fish into tanks, letting them grow and then selling them. I remember when I was very young visiting a salmon farm near Aviemore in Scotland and thinking it was more fun than that it was producing food to eat. This however is not the case as when a single tank may contain half a million fish getting things right is essential with complex infrastructure and processes. I am planning some individual diary entries on specific fish so for today will keep it to general information.

Fish Farm production fish farming systemsNow the production process starts with the design of the facilities, fish at different life stages require different conditions with water temperature and space. On farms these may be on separate buildings or tanks, each having an isolated water supply. One of the farms we looked at today spent years getting permits before even starting to allow them to source some of their water from a local river, and discharge water back into the river – even like this they still discharged more than they took!

The problems with the production systems include temperature, water filtration and feeding, the failure of one of these systems can be catastrophic for the animals causing the death of tens of thousands of fish in a single tank! Common problems with farmed fish is that they are not encouraged to move and recently there are new circular tank systems that have been developed producing a current and so encouraging the fish to swim against it causing a better quality of meat.

The biggest problem here however is the economics of production, farm owners are constantly asked for certain native fish, however these may take longer to grow which means higher food costs meaning the fish is unaffordable to buy. Even worse I believe is where it takes more little fish to feed the bigger fish during production (for example salmon takes 3 tonnes of little fish as food to produce 1 tonne of salmon to sell). Anyways this was the diseases of fish lecture today.

After this we had a physiology practical where we were looking at the absorption and digestion of glucose in the body systems though the Oral Glucose Absorption Test. For this we used rabbits checking the blood glucose before than after giving the rabbits a drink of glucose solution and then measuring the blood glucose at 30 minute intervals to produce a glucose curve. This is one of the most basic tests of insulin production and can be used to identify problems which is pretty cool.