TOP TIPS
CONTAINMENT SPECIAL
NETS: top tips N
W & J KNOX GIVE SOME POINTERS TO ENSURE YOU GET THE BEST FROM YOUR NETS
ets should be uniformly weighted around the perimeter, either with sinker tubes or independent steel weights, with a further weight at the centre to cone.
• Good husbandry always was, and remains, an important part of effective predator control. Regular removal of dead fish and skimming of moribund stock will take away the easy targets.
• It is nearly impossible to remove a net from a collar without damaging it. Equally, never assume that you can redeploy it without some form of damage. Always check a newly fitted net.
• Mort socks can present themselves as bait bags to marauding seals if not emptied on a daily basis. Seal blinds will help dramatically, but their sphere of protection is very localised.
• Abrasion can lead to significant damage on netting but it is not always visible to the naked eye. With proper attention to detail most of this can be avoided.
• Extra care should be taken when handling heavily fouled nets. They should be stropped in appropriate places to spread the load evenly down span and vertical ropes, otherwise you could cause severe point loads on netting alone, leading to failure.
• Every attempt should be made to avoid the use of pressure washers on nets, especially those equipped with ‘Turbo Lances.’ They can destroy concrete and your wellington boots, so it isn’t difficult to imagine what they do to netting.
• Hauling on a vertical rope with no supporting span ropes could result in failure of the base to wall join, especially on a heavily fouled net.
• Nets that have been lying ashore should be checked thoroughly before deployment as vermin such as rats have the potential to slice through netting like a core cutter.
POTENTIAL SNAGGING POINTS • Hinge pins • Hinge bosses • R clips • Rough galvanising • Cleats • Pallets
• Grated cage decking • Bolts
• Shackles 44 ABOVE: THESE CAGE
COMPONENTS PRESENT SEVERAL POTENTIAL SNAGGING POINTS
www.fishfarmer-magazine.com
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