Nature Nugget – The Fat Sleeper

Sleepers are goby-type fishes that are members of the family Eleotridae, but they differ from most gobies by having widely spaced pelvic fins that are never joined or modified into a sucking disk. Sleepers are named such because most have eyes that tend to have a “glassy” look, as if the fish is unconscious, and because the behavior of many is to lie still on the bottom or in vegetation waiting to ambush prey.

Sleepers are found in habitats varying from pure freshwater to seawater (marine) and in numerous brackish habitats in-between. They can move or be moved between these varying degrees of salinity without showing any indications of stress. This ability of sleepers to live in and move between freshwater, brackish, and marine water is linked to an enzyme in the fishes’ gill epithelium called “sodium-potassium-activated ATPase,” the activity of which is triggered by immersion in salt-containing water. The enzyme promotes the discharge of sodium ions from the gills, allowing the fish to maintain osmotic balance in seawater. The enzyme activity turns off when the fish moves into freshwater.

There are several species of sleepers in the United States coastal areas, the most common one being the Fat Sleeper (Dormitator maculatus). Fat Sleepers are common in vegetated fresh, brackish, and occasionally marine habitats along the Atlantic and Gulf coasts from North Carolina to Brazil and including the Bahamas and West Indies. Their preferred habitats are freshwater ponds, fresh and brackish marshes, low salinity tide pools, and coastal mangrove swamps. Adaptation to variations in coastal habitats has made this fish very resistant to low oxygen and changing water quality. The Fat Sleeper is large—up to 12 inches—and stocky (hence its name). It is mostly benthic (bottom dwelling) where it occurs in weed beds and areas of debris where it feeds on aquatic invertebrates such as copepods, ostracods, and insects.

Fat Sleepers will only breed in freshwater. When it comes time to breed, they undergo a change in body color, and after a complex mating “dance,” they spawn and lay eggs on a flat surface such as a rock. Both parents guard the eggs until they hatch. The eggs hatch within 24 hours and the young travel to saltwater to spend the first stage of their lives.

Does the name Fat Sleeper describe many of us today who claim to be a part of God’s last day church? The first part of this name certainly describes many of us. What about the second part of this name? Are we asleep? “Many have been altogether too long in a sleepy condition.” Testimonies to Ministers and Gospel Workers, 206. “Men and women are in the last hours of probation, and yet are careless and stupid, and ministers have no power to arouse them; they are asleep themselves. Sleeping preachers preaching to a sleeping people.” Testimonies, vol. 2, 337. Fortunately, there is hope for us that are in this condition. “Yet the case of even this class is not utterly hopeless. With those who have slighted God’s mercy and abused His grace, the heart of long-suffering love yet pleads. Wherefore He saith, Awake thou that sleepest, and arise from the dead, and Christ shall give thee light.” The Great Controversy, 601, 602. “We are living in the closing scenes of this earth’s history. Prophecy is fast fulfilling. The hours of probation are fast passing. We have no time—not a moment—to lose. Let us not be found sleeping on guard. Let no one say in his heart or by his works: ‘My Lord delayeth his coming.’ [Matthew 24:48.] Let the message of Christ’s soon return sound forth in earnest words of warning.” Testimonies, vol. 8, 252.

David Arbour writes from his home in DeQueen, Arkansas. He may be contacted by e-mail at: landmarks@stepstolife.org.