Amblygobius bynoesis AMBBYN-081597-BLATER-001
Breeder ID: AMBBYN-081594-BLATER-001
Date received: 8/15/97
Identification: Amblygobius bynoensis (Richardson 1844 )
Geographic origin: Indo-pacific
Description: One of three families presently recognized as “Gobies” (Rhyacichthyidae,
Odontobutidae, and Gobiidae). Most have scales, but lack the sensory lateral line on the body
found in most fishes. Representatives first appeared (freshwater) in the fossil record during the
Eocene ~ 30 to 50 million years ago. This species is similar to the more commonly collected A.
albimaculeatus but has less pronounced markings overall and often has a solid horizontal stripe extending
from the snout through the lower half of the eye just posterior of the pectoral fin. Coloration
tends to be white underside with dark markings on light tan. Fins generally lack pigmentation.
Duration male(yr): 2.5
Size male (mm): 127
Duration female(yr): 2.5
Size female (mm): 152
Broodstock notes: Purchased from a “school” of 10. Selected two which stayed together the
most. Both were 50 mm SL.
Physical differences: Male is slightly smaller and darker in color. Female is more dominant
Adult diet: Grazers, detritus. Will also eat pieces of shrimp, clam and frozen meat foods. Fed
every other day
Pre-spawning activity: Male builds nest
Time spawning began: night
Area spawning occurred: Female laid eggs on roof of burrow; male tends eggs.
Frequency of spawning: monthly
Egg description: cluster 76 mm across
Approximate quantity: 500
Size: 1 mm
Egg changes / development: light yellow, darken as they develop. Eyes visible day 3
Incubation period: 3 days
Time hatching occurred: night
Size of hatching larvae: not indicated
Yolk sac present? Yes
Newly hatched appearance: Eyes are dark. Larvae can maneuver on their own
Transfer / removal method: not removed
Spawning tank size (liters): 340
Sides of tank covered? No
Lighting & photo period: 1 – 9 watt Osram (12 hours); 130 watt fluorescent actinic (10 hours;
130 watt fluorescent white (9 hours); 220 watt VHO fluorescent
Filtration: Wet / dry. No bio-material. Live rock
Additives and dosages: 40 Fathoms ASW®, 75 liters changed every 2 weeks. Tap water for
replacement. Vitamin B 350 mg and Vitamin C 500 mg weekly. Liquid Gold® 2 ml / 2 days.
Iodine 1 ml / 2 day. Strontium 2 ml/2 day. Kalkwasser
Water temperature (F): 79
Specific gravity: 1.023
Nitrate: none detected
Fry development / changes: larvae not removed from tank. No survivors
Comments: Fish were identified from photographs by John Randall, University of Hawaii
Original description: First described by Richardson in 1844 as Gobius bynoensis, published in
Ichthy. Erebus & Terror v. 2:1, Pl. 1 (figs. 1-2) from specimen(s) collected off the coasts of
Western Australia. Information regarding validation not available.
Word origin: The genus Amblygobius from the Greek roots ambl, -y, meaning blunt; and gobi,
=us, meaning a kind of fish. The species bynoensis is unclear and no word roots are available
utilizing resources presently available to the Breeder’s Registry. The genus Amblygobius may be
in reference to the blunt noses common to this group.
Vernacular name: Spotty head goby
Thresher, R. E., Reproduction in Reef Fishes,1984, T. F. H. Publications, Neptune City, NJ
07753, USA, ISBN 0-87666-808-2