Common name: Brown Algae

Ochrophyta, commonly known as brown algae, is a diverse group of mostly marine algae that play a significant role in ocean ecosystems. These algae are known for their distinctive brown color, which is due to the presence of the pigment fucoxanthin, masking the green of chlorophyll. Brown algae are primarily found in colder waters and are most abundant along rocky coastlines in temperate regions.

One of the most interesting aspects of brown algae is their size diversity, ranging from small filamentous forms to the Macrocystis pyrifera, which can grow over 60 meters in length. Kelp forests, formed by some species of brown algae, are among the most productive and dynamic ecosystems on Earth, providing habitat and food for a wide variety of marine life.

In the aquarium hobby, brown algae are often seen as a nuisance when they appear as diatom blooms, particularly in newly set up tanks. These blooms are usually temporary and can be managed by controlling nutrient levels and lighting. However, certain species of brown algae, like those from the genus Sargassum, can be intentionally cultivated in marine aquariums for their unique appearance and the habitat they provide for small marine organisms.

Brown algae are also of scientific interest due to their complex life cycles and ecological importance. They have a unique reproductive strategy involving alternation of generations, which includes both asexual and sexual phases. This adaptability allows them to thrive in various environmental conditions.

For hobbyists interested in keeping brown algae, it's important to ensure that the aquarium environment mimics their natural habitat, with appropriate lighting, water flow, and nutrient levels. While brown algae are not typically kept as the primary focus in aquariums, they can contribute to the overall health and biodiversity of the tank.

1. Common name: Dictyota bartayresiana

   Scientific name: Dictyota bartayresiana
2. 
   Common name: forkweed

   Scientific name: Dictyota dichotoma
3. 
   Common name: An Chasfheamainn

   Scientific name: Fucus spiralis
4. 
   Common name: Bladder Wrack

   Scientific name: Fucus vesiculosus
5. 
   Common name: Oarweed

   Scientific name: Laminaria digitata
6. 
   Common name: giant kelp

   Scientific name: Macrocystis pyrifera
7. 
   Common name: Peacock's Tail

   Scientific name: Padina australis
8. 
   Common name: Funnelweed

   Scientific name: Padina gymnospora
9. 
   Common name: Peacock's Tail

   Scientific name: Padina pavonica
10. Common name: Sargassum filipendula

    Scientific name: Sargassum filipendula
11. 
    Common name: Gulfweed

    Scientific name: Sargassum fluitans
12. 
    Common name: Sargassum Shrimp

    Scientific name: Sargassum hystrix
13. Common name: Sargassum johnstonii

    Scientific name: Sargassum johnstonii
14. Common name: gulf weed

    Scientific name: Sargassum natans
15. Common name: Sargassum polyphyllum

    Scientific name: Sargassum polyphyllum
16. 
    Common name: Gulfweed

    Scientific name: Sargassum sinicola
17. 
    Common name: Sargassum Weed

    Scientific name: Sargassum vulgare
18. Common name: Peacock's Tail

    Scientific name: Stypopodium zonale