This is the 8210th most frequent Russian word.
магаданская
"Magadanskaya" refers to something related to Magadan, a city or region in Russia.
The word 'Магаданская' here is used as an adjective derived from 'Магадан,' modifying 'область' to specify the type/region.
Магаданская область известна своими суровыми зимами.
The Magadan region is known for its harsh winters.
'Магаданскую' is used as an adjective modifying 'рыбу' in the accusative case, indicating a type of fish associated with Magadan.
Я хочу попробовать магаданскую рыбу, о которой все говорят.
I want to try the Magadan fish that everyone talks about.
Here, 'магаданский' modifies 'краб,' also indicating something associated with Magadan.