http://www.aquaticinvasions.net/2014/AI_2014_Katsanevakis_etal.pdf

http://blogs.cornell.edu/naturalistoutreach/files/2013/09/Aquatic-Invasives-1z7i1qy.pdf

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.475.1133&rep=rep1&type=pdf

http://waterinstitute.ufl.edu/research/projects/downloads/p001-Ch5_SpringsNutrients.pdf

https://massbay.mit.edu/resources/pdf/factsheet.pdf

http://www.brown.edu/Research/Sax_Research_Lab/Documents/PDFs/Schlaepfer%20et%20al.%202011%20-%20conservation%20value%20of%20non-natives.pdf

bioremediation

Invasive species, of course is a serious menace as the same may out compete native species.

Such fast growing invasive water weeds often cause serious hindrance to navigation as well.

Moreover, thick cover of such weeds prevents light penetration and thus affect the normal productivity and dissolved oxygen.

However, it is an opportunity to study the biomass characteristics, phytoremediation potential and the like.

The biomass analysis can reveal whether the water weeds may be useful for preparation of biocrude or medicinally valuable compounds and the like.

Since such species are very competent to absorb nutrients very fast from waters, the potentials of the same for resource recovery (recovery of lost nutrietns) and tertiary water treatment can be explored.

Yes, every problem is an opportunity for the creative critics!

weeds can use as alternative food sources

Invasive species in aquatic environments can be a hindrance to water transport. However its important to establish alternative uses to which such species can be put. Exploitation for alternative uses confers a wide variety of benefits to users. This will depend on the species in question. For instance the water hyacinth in Uganda has been utilised to make simple furniture.

Invasive European carp in the Murray-Darling Basin Australia have become an important food source for native fish-eating waterbirds such as cormorants, herons, pelicans and darters. High abundance of carp after flooding has led to increased breeding activity of some of these birds.

According to literature, invasive aquatic  species have both positive and negative impact on ecosystem or community. Positive impact or benefits include habitat restoration, biological control of pests and fish stocks increase while negative impact includes displacement of indigenous populations, destroying water bodies, competing with native species for natural resources, decrease quality of habitat, increased potential for extinction of native populations and affect recreational activities such as boating and swimming. This can also disrupt food chain and reduce  biodiversity. If not managed well, negative impact caused by invasive species may by far supercede benefits.

There are lots of  advantages in aquatic invasive aquatic species. Following are the benifits to human  community. As food fodder,  fish feed, ornamental plants medicinal plants, animal feed , composting material, handcraft industry and etc. Its depend on uses in each country. It we utilize invasive species in some manner it will help fir their population management.  There are hundreds of research articles are available in the web for this topic. 

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Introduced in Europe, Procambarus clarki has become since last decades an abundant food resource for threatened waterbirds  like Botaurus stellaris, Platalea leucorodia, Plegadis falcinellus . Collecting, cooking and selling them has also created job (in the Rhône delta for example).