what does the word 'notions' mean in this context?

[Irene29]

Could you explain the meaning of 'notions' in the following extract, please?

By the early 1980s, poachers had nearly wiped the rhinos out. Some hunters even shot them from helicopters - so much for notions of sportsmanship.

Thanks in advance!

[Alan]

Hi Irene,

'Notions' suggests ideas/concepts. It is usually an ideal concept that you have of a belief. In this case the belief is in sportsmanship and the way people think that sports people should behave in society.

Alan
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[Beeesneees]

Hi Irene,

notion = ideas, awareness and understanding.

The poachers didn't give the rhinos a chance. They shot without consideration to how they were endangering the species.
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Cheers m' dears!

[Mordant]

"So much for (insert noun)" is a way of dismissing something as false, invalid or past utility. In this context, it means that the strongly contradictory behavior rendered ideas about fair sportsmanship invalid.