Killer Algae

It happens all the time now. And every time there is too much swell the Cruise ship changes itinerary and the punters get upset.
I think the odd freighter has had to park up outside the territorial limit and get their bum wiped as well. I'm assuming it's not the whole hull but the sea-chest thingee. I can't imagine divers cleaning the entire hull of a ship offshore. Would take a wee while.

The sea chest is an opening in the exterior of the hull. I think it is the heat exchanger. It is like a box in the hull with a grate covering it. Very popular spot for stashing drugs.

From Wiki:

Ship's reservoir/filter

The sea chest provides an intake reservoir from which piping systems draw raw water. Most sea chests are protected by removable gratings, and contain baffle plates to dampen the effects of vessel speed or sea state. The intake size of sea chests varies from less than 10 cm² to several square metres.[1]



Zebra mussel control in sea chests

When the ship is in freshwater, the hard steel surfaces of the sea chest, protective grates and baffles, combined with low water velocities created in this immediate area, provide a suitable environment for zebra mussel attachment. Zebra mussel infestations have been found to clog the individual intakes and gates of the various water piping systems, decreasing the availability of water for onboard operations, which could result in damage to engines and other components that require water for cooling. Sea chests are, therefore, considered to be the most susceptible component to serious infestation.[1]



Control strategies include coating all surfaces with an antifoulant such as copper-based epoxy paint or hot-dip galvanizing. Periodic inspection and replacement of grates and screens also reduces the risk. Increasing the size of the sea chests by 20% to 30% may delay the onset of serious problems that could force an engine shutdown. Thermal treatment is a highly effective strategy for the control of zebra mussels (McMahon et al. 1995). Thermal treatment may include retrofitting a closed loop system to recirculate the heated water to the sea chest or the addition of a second sea chest system, allowing engine cooling water to be discharged through the idle sea chest. Recirculation of engine cooling water as a thermal control strategy has proved extremely effective in controlling zebra mussels (Palermo 1992, U.S. Coast Guard 1994).[1]

Right.... Now I know what a brushcart is...

www.corishullcleaning.com/brush-kart/2nd-generation-brush-kart/

Just like driving a dogem... 

There is a new CAN out for Barrier today. But read the rules!!!!
Everyone on the other site are getting their tits in a tangle, but all it does is ban netting, trawling and dredging.

Anchoring is allowed in Fitzroy.

Fishing is allowed, including spearfishing, line fishing, drift fishing etc.

When is a CAN not a CAN?

www.mpi.govt.nz/dmsdocument/47557-Exotic-Caulerpa-Controlled-Area-Notice-



6 Notice of controls for Great Barrier Island Zone (Zone A)

For the purposes of the controls imposed below, Zone A is referred to as “the Great

Barrier Island Zone”.

(1) No person may remove any sea organisms (such as fish, seaweed, crayfish, or

shellfish) from the Great Barrier Island Zone except by the following methods:

(a) Line fishing from the shore. Line fishing includes rod and line and handline

fishing from the shore or structure fixed to the shore such as a jetty, pier, or

wharf;

(b) Drift fishing from a vessel (e.g., boat, kayak, etc.);

(c) Spearfishing and hand-gathering;

(d) Shore based longlining (e.g., kontiki or drone).

For avoidance of doubt, no person may use the following methods to remove sea

organisms (such as fish, seaweed, crayfish, or shellfish) from the Great Barrier

Island Zone: net fishing (i.e., flounder net), and bottom contact fishing methods

(i.e., dredging, bottom trawling, etc).

(2) No person may move any of the following items out of the Great Barrier Island

Zone without complying with the cleaning directions in clause 8(1):

(a) Any equipment used for fishing or other water-based activities (including, but

not limited to, diving, kayaking, canoeing, swimming, snorkelling, free diving,

and paddling) including footwear, wetsuits, diving equipment, and boat-trailers

and associated vehicles and craft.

(3) Subject to clause 6(4) and 6(5), no craft (such as boats) may enter and then

anchor within the Great Barrier Island Zone without first being granted a permit.

(4) A person does not require a permit under clause 6(3) in the event of an

emergency where no other alternative safe sheltering locations or mooring can

be easily acquired.

(5) A person does not require a permit under clause 6(3) within the following area:

(a) Port Fitzroy Permit Exempt Anchoring Zone: means the area contained

within the marine waters of Port Fitzroy, east of a line between Kotuku Point

and Mt. Overlook headland of Kaikōura Island /Selwyn Island, and east of a

line between the Man of War Passage and Governor Pass

I think they should apply those rules to the entire Hauraki Gulf.
Allow anchoring and fishing, but that you have to check and clean all of your gear.
Ban nets, trawling and dredging. It is what a lot of people have been asking for...

Rather than try and get it over the line in the name of Fisheries Management, do it under Biosecurity Legislation. Then we wont even have to involve Shane 'The Minister for Talleys' Jones.

You cant anchor anywhere south of the northern entrance to Fitzroy. You can anchor inside Fitzroy.

You can drift fish, drift dive or just drift.

These are COVID like rules. Can anchor, can fish where they have found it by Waiheke or Mercury’s. Can’t at the special peoples republic of GT Barrier or in the Iwi independent state of BOI.