Although it is controversial that jellyfish is native to Mediterranean Sea or it is invasive species, the fact is that it is rising in numbers. Jellyfish appear in many blooms which are increasing every year. These blooms of jellyfish particularly appear in the summer season. The main reason behind this is increasing temperature of seawater day by day.
Global warming included the rising temperature of ocean which enhances the species that thrive at tropical environment. If the rising temperature is becoming as the temperature of ocean water as tropical reason, the chances of growing such communities which are favorable by warm water suddenly start to increase in numbers. This can impact on the local species which are favored by cold waters due to increased number of warm water species.
Israel has approximately 188 kilometers of seashore in which only 36 km is the open space which is free for infrastructure and facilities. Rest part of seashore is either reserved for marine life, or used for defense service or municipal services. The appearing jellyfish blooms in these areas on the coast in summer are the proof of its increasing number of those species. Though there is no deadly harm to individual person who get contacted with them, there is no guarantee of the changes in these species. Tomorrow these species can be changed due to crossing with native poisonous species or evolved themselves to live in this area to get food. Though such thing will not going to happen, then also any invasive species is destructive for the native environment and become responsible for disturbance in local food web.
Current problem from these jellyfish to human being is they can stick on the pipes of the power plants. The power plants, electrical companies and many other industries generally take water from sea for the cooling purposes. The engines get hot due to continuous working and it is necessary to cool them. The seawater is the best source for this purpose but if jellyfish sucked by pumping system, they cannot work properly. In case of blooms sucking in the pumping system, it can stop the work.
The second impact is on the fishery. Few fishes, turtles and dolphins can eat jellyfish; the number of these animals is very small perhaps due to over-fishing there is problem of increasing number of jellyfish. These jellyfish can eat fish eggs and make adverse impacts on the fishery production. Tomorrow this problem can be increased due to rising number of jellyfish.