OK to be a bit more specific, the report that a juvenile Shark Warrior hasn't been seen in years. What's up with that?
As far as I can tell, either there was an interruption in the breeding program, or it got halted entirely, or they're elsewhere. Except that if it was related to the breeding program, then you'd still be seeing young freeborn warriors. So what's going on here?
By "halted", I mean that the Sharks somehow lost all their genetic legacies. They had a massive exodus fleet destroyed at Salonika* and their homeworld was savaged in WoR-- both of which surely had copies of their legacies. But their only copies? I find it hard to believe that with all their advanced preparation for a relocation, that somehow they'd waited that long to move a copy of their genetic legacies. The Sharks were lingering in the homeworlds almost to the very end. Plus, they had legacies to share with the other Council of Six clans later.
Plus, the new warriors of 3085 were decanted in 3065-- a time when the Sharks were happy as a clam. Where the sibko cadets killed in the WoR? Maybe the program is fine post-WoR but the new sibkos simply aren't old enough to have graduated yet. Except that again, if that were true we'd be seeing freeborn warriors.
Their scientist caste may have polluted their legacies severely. In which case, the Sharks don't want to advertise, but have quietly spent the past few years cleaning them up. The Home Clans had to do this, too, and it took them years as well. This could explain an interruption-- except that again, if that were true where are the freeborn juveniles?
One possible explanation is this. Maybe they're elsewhere. If the SharkFoxes have another periphery base, not just their coreward post in the Isles, then they might well be raising their sibkos there and be keeping the kids away from the IS, where they could be taken as bondsmen and reveal the secret colony before its defenses are established. That would be suicide for another clan; they rely on new warriors to replace their constant combat losses, but the Sharks are different. If there's one thing the Sharks have never lacked for, it's troops. Their retirement system means that at any time they can have two to three times their active duty contingent available as reservists-- maybe a little rusty, maybe not in the prime of life, but certainly seasoned and ready. So they don't need the steady stream of cadets to keep their touman filled.
(* I find the Battle of Salonika very suspicious. The Shark exodus fleet lingered there for weeks, even after being spotted and attacked. All they needed to do was to jump to another hiding place, leaving a warship or two to sheep-dog the stragglers. Why stick around? And then when they were attacked, the JumpShips just sat there, despite having had enough time to re-charge ten times over. The situation makes no sense whatsoever. With Vinton, the Sharks were lying low there for years, but you could at least imagine they were busy evacuating and/or waiting for pickup. With Salonika, it's like they were inviting a massacre. And somehow I doubt that Ben suddenly took leave of his senses when he wrote that. Either I'm misreading the passage or the passage is misleading me-- my feeling is that Semi Kalasa's account is... delicately phrased.)