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Only larger fish, greater than two inches, are able to eat them. Spiny water fleas can rapidly reproduce in summer because adult females can produce young without mating, when water temperatures are just right, at a rate of 10 young every two weeks. They reproduce both asexually and sexually. While young fish feed on zooplankton, they tend to avoid these two water fleas due to the long tail spine and barbs on the spine. They do it through a process known as parthenogenesis or asexual reproduction, which means that they are capable of reproducing without mating. Spiny water fleas can reproduce asexually during the summer, so only 1 individual is needed to start a population. Female spiny water fleas can produce up to 10 offspring every two weeks during the summer months. Oh, did I mention, spiny water fleas recently invaded Mille Lacs Lake, along with zebra mussels. In fall, females mate and produce resting eggs … Spiny water fleas entered the Great Lakes in ship ballast water from Europe, arriving in the 1980s. One spiny water flea can eat 20 organisms in a day. Oh, did I mention, spiny water fleas recently invaded Mille Lacs Lake, along with zebra mussels. Researchers think that Great Lakes fishing equipment can spread the fleas between different lakes and streams, and stricter cleaning regulations may help. The spiny water flea (Bythotrephes cederstroemi) is not an insect but a crustacean with a long, barbed trail.They are small and transparent, making it difficult to see them unless they occur in very large numbers. The flea population grows quickly and is difficult to control, partly because their barb-like spines make them resistant to predators. During the summer months, the spiny water flea will reproduce through parthenogenesis. Spiny water flea reproduce quickly, up to 10 offspring female“clones” every 2 weeks They live for several days up to two weeks. With translucent bodies, only about ¼ to ½ inches in length, individual water fleas may go unnoticed. There are no effective ways to control invasive mussels or spiny water fleas. Something else that I am sure you’ll find fascinating is how spiny water fleas reproduce. These crustaceans reproduce rapidly. (518) 668-9700 info@fundforlakegeorge.org fundforlakegeorge.org A majority of the population is female and is capable of asexual reproduction as well as sexual reproduction. They do it through a process known as parthenogenesis or asexual reproduction, which means that they are capable of reproducing without mating. Fish don’t eat them: The flea’s barbed tail gets caught in the throats of fish, so fish spit them out. Although capable of sexual reproduction, most spiny water fleas reproduce … In some species and under certain conditions, males — which are considerably smaller than females — … However, the species tend to gather in masses on fishing lines and downrigger cables, so anglers may be the first to discover a new infestation. Spiny water fleas are invasive in all Great Lakes and can withstand great environmental stress. Spiny water fleas are native to Eurasia and were probably brought into the Great Lakes in the ballast water of ocean-going freighters. In the fall, spiny water fleas will mate and lay “resting eggs”. Part of spiny water fleas’ success is due to their ability to reproduce rapidly — they mature and reproduce within about one week. Most water fleas are asexual and reproduce by parthenogenesis, which means embryonic growth and fertilization occur without requiring fertilization from a male. 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