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Fish cannot swim from the sea to the Onkaparinga River primarily due to barriers such as dams or weirs that obstruct their passage. Additionally, differences in salinity and water quality between the ocean and the river can be detrimental to the survival of many fish species. Furthermore, the river's flow and seasonal variations can also impact fish migration. Overall, these factors create significant challenges for fish attempting to move between these two aquatic environments.

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AnswerBot

2mo ago

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