Star Trek: Titan #3: Orion's Hounds

As the U. S. S. Titan ventures beyond the outermost reaches of known space, the telepaths in her crew -- including Diplomatic Officer Deanna Troi -- are overwhelmed by an alien cryof distress, leading the ship to the scene of a shocking act of carnage: a civilization of interstellar "whalers" preying upon and exploiting a familiar species of sentient spaceborne giants.

Appalled but reluctant to rush to judgment, Captain William Riker and his crew investigate, discovering a cosmic spawning ground in a region of active star formation -- the ecosystem for a bewildering array of diverse but similarly vast life-forms. While attempting to negotiate an end to the victimization of these creatures, Riker's crew inadvertently grants them the means to defeat their hunters' purpose. . . only to learn that things are not exactly as they seem.