ikeokoye:
Plz what could cause broken skull on catfish, my friend discovered around 10 cases this morning. Plz we need help

pricelesshoney:
Hello house, please house I want to invest in fish farm,I have been following this thread for two years now and I know I will get all the help I need here. Because of financial constraint I want to start with tarpaulin that can take about a 1000 fishes to table size, wwwhat is the length × breadth I need?Hope the tarpaulin will not damage the growth of the fish?how much does this tarpaulin cost plus set up? And what is this aerator pump I have been hearing lately?
10*15*5ft will be ohk.

olasunks:
I have two new high quality reinforced tarpaulin pond for sale size 7x10x4. Interested and serious buyers should call 08030880610.

olasunks:
I have two new high quality reinforced tarpaulin pond for sale size 7x10x4. Interested and serious buyers should call 08030880610.

lobell:


Many farmers will be interested in these products but might not be comfortable with Payment before delivery. Using an escrow service assures them that they will get what they are paying for or get their money back and it helps you to know that your buyer is committed. It's both a payment on delivery and payment before delivery because the buyer pays but the money is held in escrow until you deliver. We are calling it the Nigerian ebay. See link below and in my signature and signup today.

cbnobia:
Good day all.I have read this thread from the beginning and want to use this opportunity to that all those who have given such invaluable resource to newbies like me.I am located in Umuahia and have been in the catfish business for 18months now.It has been a roller coaster ride but I thank God for all the learning experiences. One of the challenges I had was that of poor quality fish seeds(fingerlings).I then decided to learn how to hatch myself and actually did unsuccessfully five times.I applied all the strategies I read up on this thread with minimal success and I am sure I am still getting some things wrong.I spawned yesterday and the fry are still hatching now.Pls when do I start the aerator?At what speed should it run?Is it at the highest,lowest or medium speeds?When do I start flow through?Is it when the yolk has been fully absorbed? I would really appreciate your useful responses.I really want to get beyond day 3 this time.Many thanks in advance.

cbnobia:
Good day all.I have read this thread from the beginning and want to use this opportunity to that all those who have given such invaluable resource to newbies like me.I am located in Umuahia and have been in the catfish business for 18months now.It has been a roller coaster ride but I thank God for all the learning experiences. One of the challenges I had was that of poor quality fish seeds(fingerlings).I then decided to learn how to hatch myself and actually did unsuccessfully five times.I applied all the strategies I read up on this thread with minimal success and I am sure I am still getting some things wrong.I spawned yesterday and the fry are still hatching now.Pls when do I start the aerator?At what speed should it run?Is it at the highest,lowest or medium speeds?When do I start flow through?Is it when the yolk has been fully absorbed? I would really appreciate your useful responses.I really want to get beyond day 3 this time.Many thanks in advance.

NCFarms:


Sorry for the 5 failures, but i believe with the level of determination you have, you will succed this time. I just started hatching not too long with couple of success.

First, your flow through should come up the moment the eggs have been placed on the net, though with minimal pressure ( So not to disturb the eggs).

Secondly, I dont use aerator. I believe experts in the house will assist you on this.

Hope you monitor your water pH, very paramount, you need a pH meter. Then hope you disinfect your hatching tank after every successful or unsuccessful hatch.

My few suggestion. Wish you luck.

Ttalk:


You need a constant flow through of water at a reduced speed so as not to hurt the larva. Aerator usage depends on your hatchery setup most especially at early stage. Always ensures constant temperature at this stage and maintain a dark hatchery environment. That doesnt mean you should suffocate the hatchlings. Dont stress the larva with too much siphoning, the flow through would compensate for that.

Dont wait for all the egg to hatch before removing the net. 90% hatched egg then you remove the net

Keep me posted on the development.

Francisco01:



Thank OmoOshodi for the opportunity, I will like to have it too at obilo.alozie@gmail.com
Thank you

cbnobia:

Thank you sir for your response.I truly appreciate. I removed the net at 24hrs post spawning.There were a lot of larvae swimming actively at the bottom of the vat.I also started flow through with the turn down pipe properly set since last night. I hatched with two vats.This morning I started the aerator in one of the vat at medium speed in combination with the flow through.I want to see the effect of the aerator relative to the flow through alone. As at this evening most of the larvae are dead with only a few (~10%) still active in both vats.My water pH is 8.It was 4 initially but I added sodium bicarbonate in the overhead tank to achieve a pH of 8. Is this normal?

Ttalk:


Your case is a peculiar case that requires troubleshooting to know the cause of the mortality.

First of all please pay attention to details in hatchery operation. Small negligence could cause vital damage even if you are pro.

Now this 4 reasons could likely be the cause

1. What size are your broodstocks male/female and do you have the idea of their age.

2. Do you still cover your pond after removing the net at this hot temperature. if you do you must have lost the fries to increase temperature

3. I dont recommend buffering to beginners because of inability to control pH fluctuation. If you have pH of above 6 you dont have to buffer it to get result. pH fluctuation is deadlier than average pH.

4. Can you describe the current of your waterflow as well as aeration. Picture or short video could help in this regard.

NCFarms:
That rate of mortality is not normal. From what you have done, i can draw some inferences...

1. You said you removed the spawnimg net after 24 hours, i suspect the unhatched eggs have contaminated the rest. Usually, during this hot weather it takes between 20-22hrs for the eggs to start hatching (less than 24hrs), and further extention can cause damage. Was ur water foaming when you removed the net? If yes, thats the cause...

2. I suspect you didnt disinfect before spawning. I usually use bleach for that.

3. Your female broadstock eggs mighy not be very matured. Did you check the eggs, u will see an orange dot inside.