jackboy / aquaculture

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    • 30/10/2007 at 12:01 pm #30189

      Razor Edge

        Any bass you have studied will do as I want to get an idea what if I can do aquaculture.

        Open pond condition with a natural source of water with occasional rainwater during summer months. Water can be assumed to be stagnent since inflow is negligible.

        I’m asking all this because in countries like China, Malaysia, Singapore ect they have commercial fish pond. In Mauritius, the gov is offering many incentives to promote aquaculture.

        I know I can design and build a pond of 75m X 25m and this will give roughly 6000m3. I don’t have the money though!


        1st of all mate if its a freshwater pond you’d most probably wouldn’t be farming bass in the far east.
        Most of the species farmed over there are species such as tilapia, carp, milk fish, prawns and catfish as well as sea weed.

        China is the biggest aquaculture producer in the world by far.

        However over there it really isn’t very sophisticated with it mainly being extensive and semi intensive subsistence farming

        extensive meaning it dosnt require any supplementry feeding or direct input to support the species being reared, they also use low stocking densitys and no supplementry feeding being used but can be fertalised (usally human or animal manure)

        where as semi intensive aquaculture uses stocking densities higher then extensive systems and require supplementry feeding.

        what would the natural source of water be? Bore hole, ground water, spring, and river?

        species Id go for most probably Is either tilapia or the walking catfish Clarias batrachus because both of these fish can live in very poor water quality with the advantage of clarias catfish being able to come up to the surface and breath air.
        thy also have the advantage of being able to heavily stock them something like 500kg per meter cubed because they are quite cannibalistic, I was going to buy some live clarius when I went up2 billingsgate this morning and just keep them to study (but didn’t have any by the time we’d arrive (I had to get to Hadlow by 5:30 this morning)

        anyway anymore questions ask away?

        Il do my best to answer them (at the moment doing a 3000 word assignment on British and European aquaculture.

      • 30/10/2007 at 12:04 pm #66998

        Razor Edge

          sorry i just point out u have to stock clarius at that denisty otherwise they’l canabalise each other though u would need to run it intensivly ie you supply all feed

        • 30/10/2007 at 1:50 pm #66999

          Jackyboy

            Hi,

            Thanks very much. I know this is a big project but never know one day I might me asked to comment on this type of project.

            500kg per M cube is a lot of fish!!!! I don’t think you can fit 500Kg in one M cube!!! or is it 50KG? 1m3 of water is 1mx1mx1m!!!

            In Mauritius, the Tilapia has been very succesful fish and has been thriving everywhere! The Posh cousin, the red tilapia is more acceptable for farming where it has a market value eventhough it is very low. The Tilapia is not sold on the local market, it is considered as unvaluable, the red tilapia goes for 0.75P a pound at the market and much cheaper at the government agricultural farm which they are sold 5 pence a piece! I tried them in my garden pond and they are very resistant to diseases. I’ll try to get a picture of the ponds avaialible in Mauritius, they are used to hold water for irrigation of sugarcane fields and I was looking for one of these ponds to start with which has their supply of water is either by borehole or nearby canal or dam. They are full of tilapias and not used for aquaculture, I was thinking of using one of them for aquaculture, about 6000m3 of water and some even bigger.

            I was thinking in the line of Rohu carp, barramundi (australian bass), or the japanese Suzuki which is a close cousin of the european sea bass and to make it more economical introduce rosenberghi prawns feeding at the bottom. As for prawns, I can apply to receive free sample for aquaculture. I was thinking on the line for personal fishing and perhaps twice a year harvest the fish and sell them just to cover the cost. It’s nice to have a pond where you can fish from morning to the next morning!

            This is becomming a hub in Mauritius where many investors are investing in aquaculture, I’ve seen the barramundi farm and it is well organised. I don’t know about catfish but are their flesh quality better than the above? I’ve already thought about the source of food which can be turf or easy grown grass around the pond for feeding.

            Couple of the natural park has a pay pond which they have red and normal tilapia in aquaculture. Charged me less than 2 quid and hour! How many tilapias can you catch in one hour? LOL. Last time I stopped counting when I reached 50 using 2 hooks, If I had a set of sabiki, I would have been counting them by half a dozen a cast!

          • 30/10/2007 at 3:05 pm #67000

            Razor Edge

              it could of been i remember it being half fish half water for clarius which is a lot of fish!

              carp are quite easy to grow not as hardy as tilapi or clarious but still hardy,
              to be honest i hadnt heard of Rohu carp but all cyprinids usally use the same methods,

              good thing with carp is you can mono culture them ie stock grass carp with common carp as they both feed of different coloums
              (think thats the right word basically means they feed of compeletely different things in the water)

              i should infact be spawning and rearing fry to fingerling sized commons (carp) using hormone injections next spring as part of my course.

              When I was at billingsgate this morning I was talking to one of the market stalls who farms a lot of bass and carp (think there were sea bream as well) but basically he said that there was a big demand for carp now the eu borders have opened and there are a lot of eastern Europeans over here

              there was tiliapia being sold at billingsgate aswell and to be honest it was the 1st time iv seen it in the flesh so to speak.

              And to be honest I never really looked into barramundi and thought Suzuki were a make of car! But il have a look in one of the aqua cultre books iv got at home (im sure it mentions barramundi)

              As to water type boreholes are usually better because they give a constant temperature of water and far less likely to have pollutants on the other hand you have to price in the cost of pumping the water to the surface

              Rivers are probably cheaper but make sure how clean the source of water is, im guessing (and could be wrong here) that the water pollution laws are far more relaxed over there and also the amount of siltants (aka the amount of silt and mud in the water) but then again tilapia and carp and hardy fish.

              remember you can put sea species in freshwater or they explode, but some species like bass and mullet (have a special name) and can surivive in very low concentrations of salt water.

              Ah its quite sneaky what some people do they buy prawns cheaper from Malaysia fly them over to Thailand stamp them with a Thailand stamp and get double the price (perfectly legal as well)

              But to be honest Iv mainly studied fin fish aquaculture so far. But wont do me any harm on looking prawn farming into prawn farming

              Im currently seeing if it would be possibly to keep bottom held sea cages for sand eels, so I have a year round supply of sand eels in an extensive set up but still in a cage

              but I personally think my biggest problem is locals nicking sand eels.

              but next season I shall experiment

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