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  1. #41
    Giant Trevally
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    They just keep coming.

    166cm King.

    That's 5 ft 5 inches in the old scale and bigger than quite a few adults

    Last edited by Douglas; 07-09-2018 at 07:49 PM.

  2. #42
    Giant Trevally
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    Saw some magic here in Rocky the other day that basically does away with the tagging system for data accumulation.

    Local has bought a side-scan Biosonics sounder from the US and taught it to recognize fish shapes by modifying facial recognition technology used by security services and law enforcement agencies world-wide...

    Biosonics scientific sounders start at about $100,000 US.

    It can distinguish between barra and king for example and can also count them as well as give size.

    So sounder can be told to reject data of barra and/or threadfin below a certain size or above a certain size.

    I saw a section of river ( a couple of km long and both sides) that displayed on a map every fish that fell within the parameters set by the operator.

    After a scan trip on each bank, that section of river showed 11,000 barra and king (each with an i/d number) that the sounder saw along with the GPS point at which it was seen.

    Translated onto GE map.

    Was purchased for business purposes for measuring aquatic biomass and doing things like showing the actual numbers and types of fish in a system, dam or anywhere else.

    Imagine this thing being run past the mouths of the Mary/Alligator systems in the NT (or anywhere else) at spawning. It'd give you a map of every barra, gps, size etc of all barra taking part in that process.

    It'll also recognize, count and GPS mark crocs or anything else that you want to teach it to look for. Run it up the Adelaide and it'll count the number of crocs, size and show where they are by GPS if you want.

    I've never seen anything like it.

    Here it is

    https://www.biosonicsinc.com/products/dt-x-extreme/

    Can look sideways and has low frequencies therefore range sideways isn't a problem. Can do that down to 38 khz (long range) or up to 1000 khz. Just pick which transducer to suit.

    It also has manual control of pulse duration so can produce range resolution figures better than any auto CHIRP found on any of the modern expensive models.


  3. #43
    Giant Trevally
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    Think laterally and outside the fishing box for a minute.

    Teach the device to recognize sharks. Easy. Use the side scan facility to set it up on 38 khz or similar (long range) so that it covers a beach or bay.

    Set the operator controls for say 2m or 2.5m so it will detect any shark that comes within its range that it is 2.5m or larger.

    In such cases it sends a warning alarm either to the operator or to the swimmers (or both) that a shark bigger than 2.5m has been detected in the coverage area. The operator is given a spot on a map of the beach or bay where the shark is located.

    No more drum lines which attract sharks. No more nets that entangle anything that comes along intended or not.

    Some teething ( like that?) issues but with a bit of programming and algorithm tweaking, it'll work ok.

    Sometimes star wars type technological change is difficult to comprehend in one big mouthful and is better digested bit by bit. That's what you're looking at here.
    Last edited by Douglas; 11-09-2018 at 07:35 PM.

 

 
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