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The eggs hatch in about six days and the veliger larvae are planktonic for up to six months before settling on the shallow seabed at a shell-length of about 1 mm (0.04 in). [2] In eastern Canada these juvenile snails have been recorded at a density of 1500 per square meter.
The weight of the embryonic shell in 5-day-old (120-hours-old) embryos a very short time before hatching, is 30.3 μg, and the width is 500 μm. [34] The juvenile snail hatches from 5 to 6 days old eggs. [34] The weight of the juvenile shell is 2.04 mg in four weeks after hatching. [34] There is no vaterite in juvenile shells. [15]
The snail takes 30–40 days to hatch and is then considered young (before sexual maturity). Sexual maturity begins between 4 and 16 months after hatching. The snail is relatively fast moving at about 8 mm/s. [3] The snail has a light grey or brown body, with its lower tentacles being long and almost touching the ground.
The snails can produce as many as two hundred offspring from one egg-laying event. Sometimes not all the eggs are fertilized so they do not all hatch. When they do hatch, the hatchlings run the risk of being eaten if they share an aquarium with fish. [5] Hatchling mystery snails will grow quickly if given an appropriate amount of food and calcium.
Once laid, the eggs take approximately two weeks to hatch, during which time the bright pink or orange coloration of the eggs fades. [23] First direct evidence (of all animals), that proteinase inhibitor from eggs of Pomacea canaliculata interacts as trypsin inhibitor with protease of potential predators, has been reported in 2010. [24]
Eggs are currently hatching in captivity; the time from laying to hatching is four to eight days. Snails were no longer present at Upper Hot, Upper Middle, Kidney, and Vermilion Cool springs. [5] However, they are now present at the Upper middle and Kidney due to Parks Canada's Recovery actions in 2002 for the Upper Middle and 2003 for the ...
The first snails to hatch eat the shells of their eggs. This gives them calcium needed for their shells. They may then begin eating unhatched eggs. If the snail eggs are kept at the optimum temperature, 68 °F (20 °C) (for some varieties), and if none of the eggs lose moisture, most eggs will hatch within three days of each other.
Reproduction in spring and autumn at water temperatures above 15 °C, eggs (diameter 1.2-1.7 mm) are laid in mostly elongate capsules of 8–15 mm width, each strain containing 12-40 eggs, fixed to aquatic plants, embryos are reddish with transparent shells, juveniles hatch after 14–16 days, life span up to 3 years.