Merimbula Artificial Reef – Pelagic Tower
August 2018 36’ 54.867S – 149’ 56.251E
The artificial reef will be constructed from two pelagic steel towers, similar to structures already in use off the West Australian coast.
The reef towers differ from the concrete reef modules having a much larger vertical scale. Designed by Western Australian artificial reef specialists, Subcon, the purpose built reefs are an impressive 12.5m high or the same size as a four storey building!
To add to its height, each reef weighs a massive 70 tonnes and is 10m long and 7.8m wide. The costly process of reef deployment at sea is also reduced through a new innovative technique. Instead of being loaded onto a barge and lowered using a crane, the large structure is towed out into position and its buoyancy tanks flooded to safely and cost effectively sink the towers.
Reef towers were specifically designed to not only house demersal fish species but namely to attract an array of pelagic top-water fish in a similar way to FADs. The lattice-like steel upper part of the reef will provide structure and concentrate small baitfish, attracting predatory pelagics (Kingfish). The purpose built design will also allow demersal species (Snapper & Morwong) to shelter amongst the large base structure with its various shapes, crevasses and vertical profile.
The steel lattice structure provides a complex habitat with variations in temperature, shade and hydrological effects such as current. The curved steel plates on the tower promote upwelling and the surfaces of the structure can be colonised by macro-algae, and weeds to favour a variety of different species and higher abundances of fish.
The wide range of habitats influenced by the reef towers will hold a good variety of fish species, with pelagics such as Samson Fish, Yellowtail Kingfish, Salmon, Spanish Mackerel and Tuna all expected to turn up at the reef as well as demersal species such as Pink Snapper, Dhufish and Baldchin Groper. There’s also a good chance of King George Whiting, Skippy, Flathead, Flounder and even Mulloway that are caught in the surrounding areas. All of these species have been encountered on the established South West artificial reefs but other species such as Yellowfin Tuna and Bonito are also expected to make an appearance.
The reef towers are funded using recreational fishing licence fees and are for all recreational fishers to enjoy. Anchoring right on top of reefs should be avoided as it will limit the benefit they can have to all fishers and the chances of your anchor returning. Some of the best fish will be caught around the structure, not right on top of it. Fish can be targeted by casting or trolling around the area and over the top of the reef as well as drifting near the reef location and jigging or drifting weighed baits in a burley trail.