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  • Please HELP!! Live Fish Transportation Tank Query.

    Discussion in 'The main mechanical design forum' started by prtraj, Aug 29, 2014.

    1. prtraj

      prtraj New Member

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      Hello Brothers, Hope everything is well and good.

      Well, I have a small query and hope some of you might be of some help in this regard.

      The problem is I am trying to design a live fish transportation tank for work, which will be used to transport fish fry(s) (baby fish) or full grown fish(s) to long distances from the hatchery. Since my project is Application of Plastics in Aquaculture, so I will be using plastic as my material for the tanker. I will be going with FRP. Previously, I had designed a tanker but it faced one big drawback. The problem is water splashing. So, guys can you guide me how can i minimize this water splashing inside the tank. In my previous design mortality rate was alarming, i.e., out of the total fish fries transported, around 20-25% fish fries were dead. Though all other parameters for fish environment like dissolved oxygen, water pH, etc. were correct and as per standard, but still mortality rate was a let down. So, I just want a solution to minimize or totally stop the water splashing during transportation. Please guide me. This is my first job and I don't want to loose this.
       
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    3. bdeuell

      bdeuell Member

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      Design baffles in your tank to minimize splashing/sloshing of the water. These are typical in large tanks (for transportation or on mobile veivhles) to prevent exesive liquid movement.

      Also if the tank is closed on top and filled all the way (or close to all the way) water movement will be minimized as there will be no voids (regions of air) in the tank for the water to shift into.

      Hope this helps, let me know it it is not clear why these would reduce water movement.
       
    4. prtraj

      prtraj New Member

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      Thank You very very much for your reply. Please bro can you explain how baffles will help in reducing the liquid movement and can you guide as to where i need to install the baffles in the fish transportation tank. Also, if i fill the tank completely all the way and don't keep any void above the water surface, fishes will die because they will be requiring surface oxygen and they simply can't rely on dissolved oxygen in water for respiration. So, second option is not quite viable but i will take it into consideration. I also had thought about these previously. A quick reply is highly solicited.
       
    5. bdeuell

      bdeuell Member

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      Baffles will impede the flow of water from one side of the tank to another. They are typically plates which divide your tank into smaller sections but do not completely separate them. Holes or gaps at the edges of the plates allow fluid to flow between the different sections (important for filling and draining) but restrict the rate at which the fluid can flow from one end of the tank to the other. The baffles should be installed perpendicular to the direction of motion you are trying to restrict, if you want to restrict movement in two directions you could construct a grid of baffles. You will need to asses the risk of fish being injured on these baffles.

      understanding you can not completely fill your tank is it possible to leave a small gap of air at the top?
       
    6. Erich

      Erich Well-Known Member

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      You are not the first person to design a fish transport tank.

      Google is your friend. try Fish transport tank. You will find many different designs to the problem. You will also find people selling what you want. Maybe recommending a purchase will solve your problem faster and at less overall cost.
       
    7. prtraj

      prtraj New Member

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      @Erich, Thank you brother. I have already done that too. Google is like my brother/friend/father or whatever you can say for me now a days. But the problem is my employer also has google as his mentor. He also have done the research and if he finds that I am trying to build another copy of already existing models, then simply he will show me the path of resignation. :)

      @bdeuell, And coming to the point where you have recommended to leave a small air gap at the top, it will not be enough for all the fishes. I am also working on that and maybe installing a oxygen cylinder like thing on the side of the tank to regulate continuous oxygen flow but its just in the planning phase. :D Anyways thanks for the ideas by the way!!
       

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