Freshwater snail

Conical shell snail

Under fine condition  with basic criteria: 5"X16" full tank of freshwater, bio rings

click to enlarge click to enlarge click to enlarge breed inside the petting tank automatically eggs have been found

Under poor condition with 5"X5" full tank dirty freshwater with little simple plant, pH around 8-9

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From: freshwater with water plant

Food: Bottom fish food, Dry food, grass and dry shrimp
Recommend: air-pump with sponge filter, heater and keep the water in transparent colour

Petting time: from 2004/1/
 


Discoidal shell snail

click to enlarge click to enlarge breed inside the petting tank automatically eggs have been found

From: freshwater with water plant

Food: Bottom fish food, Dry food, grass and dry shrimp
Basic criteria: full tank of freshwater, bio rings
Recommend: air-pump with sponge filter, heater and keep the water in transparent colour

characteristic

high vitality (can live even the shell cracked)

Swimming



Sometime, it may swim upside down under the water level and moving their shell to swim faster

Petting time: from 2004/12/



Conical shell snail
and Discoidal shell snail
 
Environment freshwater
Snail type Conical shell snail Discoidal shell snail
size max. 2 cm over 1 cm
life-time 3 - 5 months over 9 months
food need high normal
eggs  100 eggs in 10 groups of eggs  50 eggs in 10 groups of eggs
lay eggs
(all the year)
around 1 cm around 0.5 cm
growth fast slow
temperature 10℃-28℃ 10℃-28℃
diving time shorter  longer
(bigger shell)
vitality low high
breath use a special organ to breath air when it near the the water level




The graph show that Discoidal shell snail need to have the alga in its shell,
otherwise it may unhealthy or death

Fresh conical shell snail



Adaptability when this two snails breed in the same tank

Environment freshwater
Snail type Conical shell snail Discoidal shell snail
generation
1 2 3 4 5 6 7
1 2 3 4 5
healthy level of the shell
60% 70% 85% 90% 85% 80% ...
100% 100% 30% 60% ...
no. of snail growth up
1 2 3 15 20 8 ...
15 30 5 10 ...

Fertilization

All of them can fertilized by itself (hermaphrodites) or others  

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The small snail using the special organ join in the big snail body.

The big snail using the special organ join in the small snail body.
As the same time, the small snail can eating normally

In general, the active breeding snail do not eating during the process 

Breed

Warm environment (22-28) is more suitable for this snail breed
and eggs will become babies around half of a month

A study of egg growth from 2006/Jan/21
Target: a group of the fifth generation conical shell snail egg 
Time: Found in around 2 weeks before
Water temperature: 15-18
Day 1 of study

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Study the three in the early stage (a little cell in the egg and have a simple shape)
A study of egg growth from 2006/Sept/11
Target: a group of the seveth generation conical shell snail egg 

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early stage
only have a small group of cells in the egg

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final stage
the cells in the egg grow to a small snail

Growth

The snail have high adaptability when it is a baby, even without a good air flow

Genetic change

Original fresh conical shell snail body is grey

in generation 4, found two of the snail body is white colour since it is baby to adult

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The snail at the bottom is white and it is different from the top one.

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when it growth to adult, its colour also keep in white and different from the original one

Death

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They remain their shells after death and the shell will lose the original pattern and become brown

A study of egg growth 
Target: a group of the fourth generation Discoidal shell snail egg 
Find from: 2006/5/18
Water temperature: 25-28
Day 1 of study

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the eggs are in the early stage, the cell is starting to change
Day 3

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the egg cells become small snail and it started moving inside the egg

Day 5

the small snail born successfully

A group of the fifth generation Discoidal shell snail egg 
Find from: 2006/9/5
Water temperature: 25-28

click to enlarge

The pictures show four eggs in a group, the left two have snails growing inside
and the right two snails growth out from the egg and leaving the empty egg cells

A group of the fifth or sixth generation Discoidal shell snail egg 
Find from: 2006/11/1
Water temperature: 25-28

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The pictures show a clearer image of two eggs and it started to move


Double shell snail

click to enlarge
length: 9 cm

buy from aquarium shop

Foraging

It have two pipes to filter water for food, when foraging it open its shells a little bit and stretch out two pipes
the big one with antenna (can help detect the environment to find food and protect itself),
is to suck in the water
the small one is to flow out the water

the video show its motion in 1.5 minutes
the small pipe can search the best position to flow out the water, avoid re-filter the filtered water

click to enlarge          click to enlarge
up                                                 down
the small pipe can move up or down

start petting time: 2006/10/14


Summary

Freshwater snail is also a easy to breed. The most important thing is keep it alone and make sure they can get enough oxygen by breathing air from the water level.


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