ansihkgt 1 Report post Posted November 9, 2018 (edited) Hello all, when adjusting feed it is crucial to have a count of the number of fish in a tank. is there an easier way of counting and weighing 500 or more fish within a tank. Edited November 9, 2018 by ansihkgt (see edit history) Quote Share this post Link to post Share on other sites
ande 867 Report post Posted November 9, 2018 (edited) Hi ansihkgt Take a picture, then count the number of fish in the pic, this way the fish is not moving around and can be marked of when counted cheers Edited November 9, 2018 by ande (see edit history) Quote Share this post Link to post Share on other sites
ansihkgt 1 Report post Posted November 9, 2018 Lol, neeat. I also meant weighing them as well. Title edited. Quote Share this post Link to post Share on other sites
Toga 179 Report post Posted November 9, 2018 Hi ansihkgt, I use to catch and weigh a sample number, say 20 fish out of 500... then calculate the average weight and then x 500. Not only useful for adjusting feed rates, but also very important for assigning simple stocking density, transport density & container qty, medication, compound grow out and so much more. Cheers Joe 2 kellenw and ansihkgt reacted to this Quote Share this post Link to post Share on other sites
ansihkgt 1 Report post Posted November 9, 2018 pretty much what i was thinking of doing i have about 700 fish in total. hoping to take weigh 50 and do the math. Was hoping somebody would have a better way to tackle this. Quote Share this post Link to post Share on other sites
kellenw 860 Report post Posted November 10, 2018 22 hours ago, Toga said: Hi ansihkgt, I use to catch and weigh a sample number, say 20 fish out of 500... then calculate the average weight and then x 500. Not only useful for adjusting feed rates, but also very important for assigning simple stocking density, transport density & container qty, medication, compound grow out and so much more. Cheers Joe That's always been my approach as well. It's not going to be perfectly accurate, but it's close enough to give the operator a good sense of the total fish mass in the system. At the tilapia hatchery, this was an exercise we did about once a month. Quote Share this post Link to post Share on other sites
phri 183 Report post Posted January 21, 2020 And if you take regular weight counts (maybe 1 x every 10 days) you can follow performance of the animals with regards to total biomass, FCR and SGR. Quote Share this post Link to post Share on other sites