Notoacmea digitalis NOTDIG-092694-SHIRON-002
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Breeder ID: NOTDIG-092694-SHIRON-002
Date received: 9/26/94
Identification: Notoacmea digitalis (?)
Geographic origin: Pudget Sound
Taxonomy: (after I.C.Z.N.)
Class Gastropoda Subclass Prosobranchia
Order Archeogastropoda Superfamily Pleurotomariacea
Duration male(yr): 5.0
Size male (mm): 20
Duration female 1 (yr): 5.0
Size female 1 (mm): 20
Broodstock notes: Originally collected from rocky shores, San Juan Island, Washington
Physical differences: None
Adult diet: Diatoms on rock surfaces
Pre-spawning activity: Maintain animals at ~47 F overnight. Place in bowl of fresh seawater and allow to come to ~ 70 F. Animals generally spawn. Eggs fertilized by placing sperm suspension with eggs.
Time spawning began: induced
Area spawning occurred: not particular
Frequency of spawning: weekly during spring
Egg description: Eggs, cloudy; Sperm “smokey poof”
Approximate quantity: 1000
Size: 160 micron
Egg changes / development: Fertilized eggs rinsed using 100 micron nitrex screen with seawater.
Incubation period: none (?)
Time hatching occurred: n/a
Newly hatched appearance: Trochophore form after 20 hours (~ 200 micron). Shelled veliger after 48 hour (~225 micron long)
Transfer / removal method: Eggs and sperm collected in separate containers and mixed for fertilization.
Spawning tank size (liter): 250
Sides of tank covered? No
Lighting & photoperiod: ambient
Filtration: Open system. Tank is 1 x 1 x .25 meters
Additives and dosages: None
Water temperature (F): 48 – 53
Specific gravity: NSW
Fry development / changes: Massive mortality in culture at end of day 7 due to ciliate bloom(?). Remaining larvae (~ 100) settled and metamorphosed at 170 180 hours.
First food offered: non-feeding
1st week(%): 100
2nd week: 0.5
3rd week: 0.5
4th week: 0.25
Development description: Once larvae settle and metamorphose they live in the “scuz” on the bottom of the tank. Ciliate blooms are common in limpet cultures, possibly from initial water.
Rearing tank size (liter) 0.25 (beaker)
Lighting & photoperiod: ambient
Filtration: moved to open system 250 liter tank
Additives and dosages: none
Water temperature (F): same
Comments: Water flows through at an exchange rate of 500 liter / hour. Ciliates are believed to feed on unfertilized eggs, then attack embryo and larvae.
Word origins: Not, -a, -ae, -al, -o, =um, (Greek), the back. Acm, =a, (Greek), the highest point, a point. OR acmae, -o, (Greek), flourishing, mature. digit, -al, -I, (Latin), a finger or toe. The common name is finger limpet. The height of a limpets shell is sometimes associated with its position in the intertidal zone (Ricketts, et al, 1985), thus the genus word origins of “back with the highest point”
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. 1994