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count the number of prawns in pond — Parallax Forums

count the number of prawns in pond

pavanalluripavanalluri Posts: 1
in BASIC Stamp
i want to count the number of prawns in the pond generally the water in the pond is muddy. i want a sensor to find the count in the ponds and their size.

Comments

  • tomcrawfordtomcrawford Posts: 1,129
    Anybody ever tried a Ping under water?
  • LtechLtech Posts: 380
    Yes the Germans and British in WW II 1944
    Destroyers and U-boot fights.
    :innocent:
  • Keith YoungKeith Young Posts: 569
    How much are you willing to spend to accomplish this?
  • Tracy AllenTracy Allen Posts: 6,664
    The first thought is a murky pond ringed with cattails and half submerged fallen trees. Or maybe a rocky wide spot in stream with lots of scattered rocks. I'm sure a good field biologist could come up with a sampling scheme, but...

    ... could it be that this pond is a circular tray 3 meters in diameter with water uniformly 10cm deep and with controlled circulation and prefab hiding places? Okay, still a tough order to count them with "a sensor" who is not a human with eyes and hands!



  • SeairthSeairth Posts: 2,474
    Tracy Allen wrote: »
    ... could it be that this pond is a circular tray 3 meters in diameter with water uniformly 10cm deep and with controlled circulation and prefab hiding places? Okay, still a tough order to count them with "a sensor" who is not a human with eyes and hands!

    That one is easy! Just count the number you put in the "pond" in the first place! :D
  • Tracy AllenTracy Allen Posts: 6,664
    :lol: But aquaculture, they reproduce!?
  • KeithEKeithE Posts: 957
    Not an answer, but some interesting information here:

    "A highly sensitive underwater video system for use in turbid aquaculture ponds"

    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4995459/

  • ercoerco Posts: 20,257
    Easy to ask. Hard to do in practice.

    So much easier and tastier to count the number of prawns on my plate. N approaches zero as T increases.
  • KeithEKeithE Posts: 957
    erco wrote: »
    Easy to ask. Hard to do in practice.

    So much easier and tastier to count the number of prawns on my plate. N approaches zero as T increases.

    Erco - you want to pursue a career in neural research using the California spiny lobster.

    http://ucsdnews.ucsd.edu/archive/newsrel/science/alobster.htm

    I remember hearing about this sort of thing years ago, and the researchers were very good about properly recycling the lobsters.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    Here's how it's done with fish:

    http://sciencing.com/shock-pond-determine-quantity-fish-7766332.html

    Maybe it will work with prawns.

    -Phil
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