Originally Posted by
mboswell1982
http:///forum/post/2939064
what do you think about derbesia as a macro algae joe?
I have heard some good things but to tell you the truth all I know about it is what fallows
The many species of Derbesia are members of green algae (division Chlorophyta), where they belong to order Caulerpales, in the family Derbeciaceae. The genus Derbesia seems to be cosmopolitic with species found in cold, temperate and tropical waters. The most commonly mentioned species is Derbesia marina, which is reported from Polynesia (Payri & al., 2000), from the Caribbean (Littler & al, 1989), from the Mediterranean (Riedl, 1983) and from cold waters, such as from the Atlantic, North Sea, and along the Norwegian coast (Nicholls, 1976). It has been observed the algae myself in the Maldives and along the coast of Norway, and as mentioned above, is found it to be very common and often abundant in marine aquariums.
THE REPRODUCTIVE CYCLE OF Derbesia (From Hoek & al (1978) in Foss堦amp; Nilsen (1996). Derbesia is a heteromorphic diplohaplont. This means that during a complete life cycle the algae alters between a haploid and a diploid stage that appear differently. The sporophyte is the algae threads , which develop pear-shaped sporangia that are attached to the algae threads by a little stalk. Inside the sporangia, zoospores develop by the means of meiosis. About half of the zoospores settle and develop to female gametophytes while the other half settle and develop to male gametophytes . The gametophytes grow to about 5 mm height and are known as Halicystis-stages. The Halicystis contain chloroplasts and many nuclei and a large vacuole in the centre. The fertile male gametophyte develops light-green patches and male gametes are released through pores The female gametophyte develops dark-green patches and releases female gametes . The gamete fuses to a zygote that settles and grows to a new sporophyte. The life cycle is completed.