Type of fouling organism: Brown Algae
Algae include several groups of relatively simple, eukaryotic, living aquatic organisms that capture light energy with different pigments and use it through photosynthesis to convert inorganic substances into organic matter. Algae vary from small, single-celled species to complex multicellular species, such as seaweeds. Seaweeds live in the sea or in brackish water occupying both the inter and sub-tidal. The algae can be distinguished by the different pigments into three basic colours: red, green and brown. There are about 2,200 species of brown algae and most are marine. Typically, brown algae are larger and more species are found in colder waters. The kelps are the largest and the most complex in this group and are the only brown algae with internal tissue differentiation. The giant brown kelp is harvested for use in commercial products such as toothpastes, soap, ice cream, and a range of other applications.
Alaria esculenta is a kelp with a claw shaped holdfast with a short cylindrical stipe with wavy membranous lamina ca 70 mm in length on either side. The frond can deteriorate over time and only the midrib remains. Their colour is yellow to olive green with a supple and flexible to texture. A. esculenta grows to a maximum length of 2 metres.
Environment and Habitat
- Found from low intertidal to subtidal, generally to 8 m depth but on very exposed shores be found at depths of up to 35 m.
- Reproductive type: Alternation of generations.
- Permanently attached.
- Stock species particularly shellfish.
Effects and Impacts
- Problematic for stock species as can compete for space and resources.
Control/ Strategies and Management
Principles of Management
C Combat Settlement
- Found on North Sea and north Atlantic coasts.
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