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Topic: Daphnia

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Water flea

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	Daphnia
		Daphnia eggs (you will see them from time to time on the backs of females) are little fl specks (quite flat actually) which are impossible to sort out of dirt.
		I pulled all the algae-covered plant matter out of the daphnia tank (which seemed to be helping to clear the water as well), all the sludge (from sponge squeezings, etc.), and put all this into a tank of tank change water.
		My thinking was that some daphnia may have been hiding in the mess and I would let it sit for a while until they emerged and grew, and catch them before I threw the mess out.
	www.thekrib.com /Food/daphnia.html (8022 words)

	2005 Young Naturalist Awards - Environmental Effects of Industrial Run-off on Daphnia magna
		This was to ensure that the Daphnia magna were all the same age and that some of them would not die from old age at the beginning of the experiment, because this would alter my results.
		The Daphnia magna were allowed to reproduce, and their offspring were then used in the experiments.
		I monitored their heart rate by examining the Daphnia magna under a microscope and counting the beats per 15 seconds; this was then converted to beats per minute.
	www.amnh.org /nationalcenter/youngnaturalistawards/2005/Mauree1.html (750 words)

	Re: Why does ethanol slow down the heart rate of Daphnia?
		Daphnia is the name of a group of small, aquatic crustaceans commonly called water fleas.
		The chemical to be tested is added in various concentrations to the water in which the crustaceans are swimming.
		By comparing the heart rates of Daphnia in the two groups, you can tell whether the tested chemical is a heart stimulant, depressant, or has no effect on the heart rate.
	www.madsci.org /posts/archives/mar99/922685827.Gb.r.html (833 words)

	Daphnia Genomics Consortium - Welcome and Introduction
		The Daphnia Genomics Consortium (DGC) is an international network of investigators committed to mounting the freshwater crustacean Daphnia as a model system for ecology, evolution and the environmental sciences.
		Announcing DGC Meeting 2007: The Genome Biology of the Model Crustacean Daphnia.
		Copyright 2000-2007: The Center for Genomics and Bioinformatics, and The Trustees of Indiana University
	daphnia.cgb.indiana.edu (210 words)

	New York Web Design - Daphnia
		See how much Daphnia has helped its clients improve their web traffic.
		- Daphnia's web site design for Wall Street Systems is launched for company-wide internal review.
		[06.06] For a limited time, Daphnia is offering free web site analysis service.
	www.daphnianyc.com (169 words)

	Daphnia
		daphnia, water, beta carotene, vitamin B12 supplement, pyridoxine hydrochloride (source of vitamin B6), l-ascorbyl-2-polyphosphate (stabilized vitamin C), riboflavin, thiamine mononitrate, biotin, choline chloride, folic acid, pantothenic acid, inositol, niacin
		Daphnia helps your fish purge their digestive systems within five to seven days.
		Handling a frozen food that is derived from a live animal can cause the same allergic reaction possible by handling the live animal itself.
	www.hikariusa.com /daphnia.htm (228 words)

	Daphnia For The Aquarium
		Daphnia are a great food source for both young and adult aquarium fish, you could catch them with a net in a pond, but their's a risk of bringing in parasites.
		Daphnia belong to a group known as the Daphniidae, and are close relatives of the freshwater shrimp, and the brine shrimp (Artemia).
		Daphnia are a small crustacean, and are great to use as a fresh food because they will exist in the tank water until eaten by the fish.
	www.tinkerfish.com /aquarium/2005/09/daphnia_for_the.html (961 words)

	Daphnia - Wikipedia, the free encyclopedia
		Daphnia are small, mostly planktonic, crustaceans, between 0.2 and 5 mm in length.
		Daphnia are members of the order Cladocera, and are one of the several small aquatic crustaceans commonly called water fleas because of their saltatory swimming style (although fleas are insects and thus only very distantly related).
		Daphnia, like many animals, are prone to alcohol intoxication, and make excellent subjects for studying the effects of the depressant on the nervous system - due to the translucent exoskeleton, and the visibly altered heart rate.
	en.wikipedia.org /wiki/Daphnia (1055 words)

	Daphnia
		Daphnia also sometimes called a water flea is a genus of Crustaceans that is found abundantly in small bodies of fresh water.
		Daphnia are ectothermic animals as opposed to endothermic whose body temperature is maintained by homeostasis.
		Daphnia are often used to clear fish tanks of algae “bloom” because of their diet of bacteria, fine detritus, and very small algae particles.
	mason.gmu.edu /~nqureshi/biology/Daphnia.htm (1485 words)

	Daphnia
		Daphnia are a high bulk food; that is, a high proportion of the animal's body is covered with a chitinous exoskeleton - a sort of skeleton on the outside.
		Daphnia are small aquatic crustaceans commonly called water fleas, due to their small size and jerky swimming motion, and are extremely abundant in suitable freshwater habitats.
		The life span of Daphnia, from the release of the egg into the brood chamber until the death of the adult, is highly variable depending on the species and environmental conditions.
	members.optushome.com.au /chelmon/Daphnia.htm (1587 words)

	DAPHNIA
		Daphnia are free swimmers, propelling themselves with surprising speed, considering they use a pair of modified antennae to swim.
		Daphnia can be kept in green water (water with a high concentration of single-celled algae) at room temperature or a little cooler.
		Daphnia are scavengers and feed on microscopic algae and protozoans normally found in pond water.
	www.lawrencehallofscience.org /foss/fossweb/teachers/materials/plantanimal/daphnia.html (524 words)

	Daphnia, fresh water crustacean (arthropod)
		Daphnia are crustaceans and related to lobsters, crabs and shrimp.
		Daphnia have a single compound eye and there are normally five or six appendages attached to the thorax.
		Daphnia are slightly denser (heavier) than water so without active movement, they settle to the bottom.
	www.microscope-microscope.org /applications/pond-critters/animals/daphnia.htm (206 words)

	Culture Techniques of Moina : The Ideal Daphnia for Feeding Freshwater Fish Fry
		Daphnia are small freshwater cladoceran crustaceans commonly called "water fleas." This common name is the result not only of their size, but their short, jerky hopping movement in water.
		Daphnia have a body consisting of a head and a trunk (Figure 1).
		One of the major characteristics of daphnia is that the main part of the body, the trunk, is enclosed in an external skeleton (carapace).
	edis.ifas.ufl.edu /BODY_FA024 (3673 words)

	Daphnia
		Daphnia are a high bulk food; that is, a high proportion of the animal's body is covered with a chitinous exoskeleton - a sort of skeleton on the outside.
		Daphnia are small aquatic crustaceans commonly called water fleas, due to their small size and jerky swimming motion, and are extremely abundant in suitable freshwater habitats.
		The life span of Daphnia, from the release of the egg into the brood chamber until the death of the adult, is highly variable depending on the species and environmental conditions.
	members.optusnet.com.au /chelmon/Daphnia.htm (1587 words)

	Ecology Group - Education Programs (Site not responding. Last check: )
		Daphnia are commonly maintained in laboratories for testing toxic substances in water.
		Daphnia themselves are an important part of the diets of small fish and predaceous insects and their larvae.
		When the Daphnia arrive, it is a good idea to acclimate them to the water temperature in the tank (Ambient air temperatures of 18 - 22 C are perfectly acceptable).
	www.pnl.gov /ecology/Rivers/Aquarium/daphnia.html (802 words)

	Max-Planck-Institute for Limnology
		Daphnia carry their eggs and embryos in a transparent brood pouch on their backs until they hatch out.
		Thus, Daphnia are part of a sediment egg bank, which offers an opportunity to study the contribution of past generations on population dynamics and population genetics of the present.
		Measuring the impact of Daphnia on phytoplankton: in situ studies of grazing impact, occurrence and origin of clear-water phases, diel grazing cycles in connection with DVM; laboratory studies measuring feeding performance and food selection of individal daphniids; chemical induction of colonies in green algae by a factor released by Daphnia.
	www.mpil-ploen.mpg.de /english/physeco/daphnia.htm (701 words)

	Olympus Microscopy Resource Center: Mortimer Abramowitz Gallery of Photomicrography - Daphnia Egg Case
		Daphnia are members of a genus of tiny crustaceans that belong to the order Cladocera.
		Predators of Daphnia release chemicals referred to as kairomones, which cause the water fleas to grow a protective structure around their heads, similar to a helmet.
		Interestingly, young Daphnia are more likely to have a larger defensive shield if their mothers have been exposed to kairomones, than those that have never been exposed to the chemical.
	www.olympusmicro.com /galleries/abramowitz/pages/eggcasedaphniasmall.html (235 words)

	Re: Daphnia foods
		Daphnia is so good for fish and it stimulates a lot of feeding interest by many turtles, and it does improve growth and survival rates of fish fry while holding down costs.
		Daphnia and newly hatched baby brine shrimp are better in combination than either alone, but with the current costs of cysts, you can go heavy on the daphnia.
		L ook to see how many daphnia are present in the culture; look to see if they are actively swimming all over, mostly at the surface in swirls, or concentrated in one spot closest to the light.
	fins.actwin.com /live-foods/month.200108/msg00006.html (1085 words)

	* Daphnia - (Aquarium): Definition (Site not responding. Last check: )
		We raise what is probably D. Daphnia tend to be almost kidney shaped, posessing only a single compound eye (though they have an ocellus, a simple eye), two doubly-branched antennae (frequently half the length of the body or more),...
		Daphnia are tiny water fleas, which are found in large numbers in ponds during the warm months of the year especially farmyard ponds that contain rotting organic matter.
		Many small aquatic organisms, such as daphnia, brine shrimp, mosquito larvae, "blood worms" and the old-timer's favorite tubifex worms are collected, cleaned and quickly freeze-dried to be used as treats for aquarium fish.
	en.mimi.hu /aquarium/daphnia.html (1136 words)

	Daphnia pulex, live tropical fish food and food for aquatic newts and frogs.
		Daphnia, also known as water fleas due to their jerky swimming movements, are simplicity itself to culture, as most daphnia are females and produce live young regularly if adequate food is present.
		Daphnia have a brooding pouch (in this photo, the baby daphnia are dark orbs) from which young daphnia are born live.
		As previously mentioned, daphnia are very sensitive to metals, so don't use water fresh from the tap, either pond water or aged water from tanks, or as in our system, Green water from a large and stable source.
	www.livefoodcultures.com /Daphnia.html (1722 words)

	DAPHNIA
		Daphnia are free swimmers, propelling themselves with surprising speed, considering they use a pair of modified antennae to swim.
		Daphnia can be kept in green water (water with a high concentration of single-celled algae) at room temperature or a little cooler.
		Daphnia are scavengers and feed on microscopic algae and protozoans normally found in pond water.
	www.lhs.berkeley.edu /foss/fossweb/teachers/materials/plantanimal/daphnia.html (524 words)

	Nikon MicroscopyU Movie Gallery: Daphnia (Crustacea) Video No. 2
		Daphnia has a discrete head bearing antennae and a bivalve carapace that encloses all or most of the trunk and abdomen.
		Daphnia is one of many groups of cladocerans nicknamed "water fleas" because of their resemblance to the common flea and their characteristic "hopping" locomotion associated with the strongly beating antennae.
		Like other cladocerans, daphnia are an important part of the food chain, filter-feeding on microscopic particles and phytoplankton and, in turn, providing food for juvenile fish.
	www.microscopyu.com /moviegallery/pondscum/crustacean/daphnia/56k/daphnia02.html (256 words)

	Environmental Inquiry - Bioassays Using Daphnia
		Daphnia, popularly known as water fleas, are small crustaceans that live in fresh water such as ponds, lakes, and streams.
		Daphnia are excellent organisms to use in bioassays because they are sensitive to changes in water chemistry and are simple and inexpensive to raise in an aquarium.
		It is worth keeping in mind, though, that even under the best conditions these organisms live only a month or two, and in nature most of them get eaten within their first few days or weeks of life.
	ei.cornell.edu /toxicology/bioassays/daphnia (201 words)

	Daphnia
		Daphnia tend to be almost kidney shaped, posessing only a single compound eye (though they have an ocellus, a simple eye), two doubly-branched antennae (frequently half the length of the body or more), and leaf-like limbs inside the carapace that produce a current of water which carries food and oxygen to the mouth and gills.
		The life span of Daphnia, from the release of the egg into the brood chamber until the death of the adult, is highly variable depending on the species and environmental conditions (Pennak, 1978).
		Identifying Daphnia species accurately is best achieved using their size, the shape of the ephippium, the shape of the rostrum and whether the post-abdomenal extension is long/short and/or whether smaller appendages close to it are setose (covered with small hair-like structures).
	www.caudata.org /daphnia (7965 words)

	CNN - Daphnia evolve into pollution eaters - October 1, 1999
		A Daphnia crustacean swims in a sea of toxic blue-green algae.
		Daphnia with 1960s genes — before the lake was polluted — could not eat the cynobacteria.
		However, Daphnia from the late 1970s forward could survive on a diet laced with the toxic algae.
	www.cnn.com /NATURE/9910/01/pollution.eaters.enn/index.html (455 words)

	ADW: Daphnia pulex: Information
		Daphnia can be found in almost any permanent body of water, even in rain-filled tire ruts or several meters from the ground, growing in tree moss in a rainforest.
		Daphnia usually live about ten to thirty days and can live up to one hundred days if their environment is free of predators.
		Daphnia are also able to avoid predators in a process called cyclomorphosis in which they change their size and shape in order to be a less suitable foodsource.
	animaldiversity.ummz.umich.edu /site/accounts/information/Daphnia_pulex.html (1898 words)

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