Physical description:
The black eye Goby usually has the length of 18 centimeters, but some of them can reach up to 30 centimeters. The black eye goby has frog-like shape of head, with raised big black eyes. They have soft bodies and spineless dorsal fins. When a blackeye goby is threatened it changes its colors in the body. The black and brown splotches that’s covering their body lightens up when a predator comes near.
Reproduction:
The female black eye goby spawn in the nest she makes every 20 days from April up until September. And after spawning the male black eye goby takes over and protects the eggs.
The female goby is mature to lay eggs by 1 or 2 years of age, and males at 3-4 years. The female black eye goby deposits approximately 500-3.000 eggs.
Habitat:
The black eye goby prefers to be near rocky areas with a lot of hiding places. And the blackeye goby is able to survive even in much pollutionized water or also in very low oxygen concenstraited water.
They are able to live on salty water and just plain water.
Feeding:
Gobys eat by stealing the worms off an angler’s hook. The black eye goby is a (zebra) mussel eater. They also prey on youngs and eggs, even their own. They prey on aquatic insects. And finally the black eye goby is able to eat in complete darkness with no problem because they have a very good sensory system.
Predators: Opsanus Beta
An interesting fact about the black eye goby:
The black eye goby likes to rest on the back of the sea cucumber sometimes

References:
Research from www.google.ca
http://elib.cs.berkeley.edu/kopec/tr9/html/fam-gobies.html
http://www.fishbase.org/summary/speciessummary.php?id=3847
http://www.jongrossphotography.com/gallery.php?searchterm=&project=&page=iz

Andy Lamb and Phil Edgell: "Coastal fishes of the Pacific Northwest"

                  J.L Hart: "Pacific fishes of Canada"