Well, Stranger journeyed up the river, towards the source (though obviously never reaching it). We know that the mudokons celebrated the Gabbit migration the same way the Native Americans celebrated the salmon migration, so presumably mudokons live further down the river, nearer the Mongo Delta. Perhaps the Grubbs also celebrated them, but the fact is that gabbits were all but extinct during SW.
The dam obviously doesn't help with the gabbits' endevours to spawn, so clearly Sekto Industries did not get on with Glukkon enterprises, as the presence of the dam severely restricts the production of Gabbiar.
Unless the eggs are extracted from captured gabbits, in which case Gabbiar eggs are not fertile, meaning Munch has to fertilise all the eggs, which spells doom for the ill-fated gabbits, who will die out after a few generations of rampant inbreeding.
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