Hypsoblennius hentz HYPHEN-112297-RIVZOO-002
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Breeder ID: HYPHEN-112297-RIVZOO-002
Date received: 11/22/97
Identification: Hypsoblennius hentz (Lesueur 1825)
Geographic origin: Chesapeake Bay, Atlantic Ocean, Gulf of Mexico; saltmarshes
Taxonomy: (after I.C.Z.N.)
Species: hentz (lesueur, 1825)
Description: The family Blenniidae is the largest family in the suborder Blennioidei commonly called combtooth or scaleless blennies. They are small, shallow-water, bottom dwelling fish. The combtooth blennies are recognizable from other blennioid families by the lack of scales, fewer spiny dorsal fin rays than soft rays and possessing incisor like teeth (hence the name combtooth).
Hypsoblennius hentz have long slender bodies with a blunt snout and “feathery” cirri above the eye (thus the vernacular name Feather blenny). A blue spot is present on the dorsal fin, more brilliant on males and being pale on females. Size has been reported from 12 – 15 cm
Length of time in captivity – male(yr): since 4/6/97 (date of report 11/22/97)
Size male (mm): 64
Length of time in captivity – female 1 (yr): since 4/6/97 (date of report 11/22/97)
Size female 1 (mm): 51
Duration female 2 (yr): since 4/6/97
Size female 2 (mm): 51
Broodstock notes: Initial quarantine process (while spawning) that included three (3) formalin dips and a one day praziquantel bath.
Physical differences: male has bright blue spot on dorsal fin. Females have pale spot on dorsal fin.
Adult diet: Mostly Mazuri Aquatic Gel® diet once per day; zooplankton every 2 weeks
Pre-spawning activity: Animals were in an off-exhibit; mostly bare fiberglass tank. They were given PVC pipe to hide in after being collected in marsh. Pair almost immediately began laying eggs on pipe.
Time spawning began: evening (?)
Area spawning occurred: on inside surface of 1 ” PVC pipe at elbow (always on elbow)
Frequency of spawning: constantly until 6/27/97, then took a 2 week “break”. Male guards and aerates the eggs constantly.
Egg description: Circular nest 50 – 76 mm in diameter
Approximate quantity: ~ 500
Size: 1.5 – 2 mm
Egg changes / development: Eggs become darker and just before hatching become rather shiney
Incubation period: ~ 4 days
Time hatching occurred: evening
Size of hatching larvae: ~1 mm
Yolk sac present? No
Newly hatched appearance: The larvae are attracted to the light and mostly stay near the surface.
Transfer / removal method: PVC pipe was removed to another tank and replaced with another piece (which eggs were laid on immediately)
Spawning tank size (liter): 950
Sides of tank covered? Sides and back are solid fiberglass, light blue in color
Lighting & photo period: Overhead fluorescent shop light. 8:00 AM – 6:00 PM, 10′ above tank (~12′ from animals)
Filtration: Bio-tower and one small cannister filter. Instant Ocean® ASW changed 20% weekly
Additives and dosages: see quarantine notes under
Water temperature (F): 77 (76 – 78)
Specific gravity: 30 ppt
pH: not indicated
Nitrate: not indicated
Fry development / changes: Fry spend most of the time near the surface for the first 2 months, then begin to settle down in the water column.
First food offered: rotifers (S strain), constantly
Second food offered: Artemia at 6 weeks
Survival 1st week: ~100
2nd week: ~75
3rd week: ~65
4th week: ~40
Development description: metamorphosis occurs at approximately 2 months. Losses evenly distributed over period. Long term survival = 9 (week 10 on)
Rearing tank size (liter): 2 5 gallon buckets; 10″ diameter
Sides of tank covered? One black, one red
Lighting & photo period: ambient
Filtration: None, daily water changes of 30%. Single airstone.. Moved to 37 liter glass aquarium at week 9. Instant Ocean® ASW (from adult tank)
Additives and dosages: none indicated
Water temperature (F): 76 – 78F
Specific gravity: 30 ppt
Original description: Lesueur in 1825 described Blennius hentz in the Journal of the Acadamy of Natural Science, Philadelphia, Vol 4 (pt 2) based on specimens collected at Charleston, South Carolina, U.S.A. No types known. Gill in 1861 described this species as Hypsoblemmius hentzi. Valid as Hypsoblennius hentz in Vol 13 of the same journal, however it is listed as “an unjustified emendation of Blennius hentz”. It was validated in 1996 by Bath as Hypsoblennius hentz (no i on the end). All listed specimens in collections researched list the species as H. hentzi
Vernacular name: Feather blenny
Word origin: The genus Hypsoblennius could be from the Greek root hypso meaning high; or from another form of hyps (meaning high); and o meaning egg; and blenno meaning a kind of fish. The species hentz (or hentz) appears to be in honor of someone named Hentz.
About this report: Information contained in this report is taken from submitted observations. Taxonomy, Synonomy, Original description, Word origin and Suggested reading are provided by member(s) of The Breeder’s Registry staff. Information is presented under the belief that it is accurate. If you have information in addition to, or contrary to that presented you are encouraged to contact the Breeder’s Registry. Permission is granted for “one-time” personal use. Reproduction as distributed or accessible media is prohibited without prior written permission. All rights reserved. 1997