Resources

Lake & pond management & water garden supplies

FILAMENTOUS ALGAE

Single algae cells that form long visible chains, threads, or filaments, starts growing along the bottom in shallow water, or attached to structures in the water, gives off oxygen that becomes entrapped in the mat of strands causing it to rise to the surface, often a persistent problem because it reproduces by plant fragments, spores and cell division

Spirogyra

Very fine bright green filaments, slimy to the touch, normally encountered during the colder months

Pithophora

Often referred to as “horse hair” algae, very coarse and thread-like with a texture of steel wool, normally brownish-yellow or brownish-green in color, forms dense clumps as it rises to the surface

Hydrodictyon

Easily identified by septagon shaped cells, net-like pattern in early matting stages, normally yellowish-green, occurs later in the season, likes clean, eutrophic water

Oscillatoria

Long blue-green, unbranched filaments that oscillate naturally, common in farm ponds

PLANKTONIC ALGAE

Microscopic free-floating plants, blooms cause water to appear pea soup green or brown in color, can cause problems for fish if a sudden die off occurs, characteristic of very high nutrient levels in the water, extremely difficult to control

Microcystis

microscopic in size but in bloom proportions, will turn water a blue-green color and form surface scums

Aphanizomenom

forms strands in bright green in color, in abundance will form surface scum

Anabaena

Causes strong odor even in small numbers, forms surface scum

CHARA

Has the most complex structure of all green algae, often called stoneworts, skunkweed or muskgrass, becomes encrusted with calcium carbonate with maturity, has a “skunky” smell when crushed, easily confused with Naiad pond weed

Curly Leaf Pond Weed

very invasive exotic species of weed, grows in spring with cold water & will naturally die off when water temperatures approach 70 degrees

Eurasain Watermilfoil

very invasive exotic weed species, rapidly disperses through fragmentation, will form canopy, very competitive & able to completely dominate a plant community within a couple years