Please space between paragraphs. (Say: "We are non-native English speakers.)
I don't see the point in mentioning that the crayfish you collected were wild. I would leave "wild" out. (Are there such things as tame crayfish?)
In plain english, what does "We found that the origin of parthenogenetic clones arose quite recently" mean?
I suggest deleting "threatened" in the phrase "threaten threatened aquatic plants".
Say: "Red swamp crayfish...have been transplanted...."
Say: "They were introduced...."
Say: "...and has established dense populations...."
Say: ""due to translocation by humans for food and lack of local predators."
tons (AE) tonnes (BE)
Say: "...the species threatens local fish, crustacean...and local freshwater ecosystems."
Say: "Their burrows...destroy rice fields."
I think I would use frequency there rather than frequencies.
I suspect that you already know that the phrase should be environmental factors (as the second sentence indicates).
I suggest that you delete wild and will.
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