- The sea urchin is a
spiny and hard-shelled sea animal which lives on the rocky seafloor,
from shallow waters to great depths.
- These globular marine
invertebrates move very slowly along the seabed. There are about 700
different species of sea urchins worldwide.
- Two common species of
sea urchins are the red (Strongylocentrotus franciscanus) and purple
(S. purpuratus), in shallow waters of California. Both species have
been implicated in the decline of kelp beds.
- In Japan, sea urchins
are protected rather than destroyed.
- Many sea urchins have
venomous spines. The biggest sea urchin is the red sea urchin
(Strongylocentratus franciscanus); having a test about 7 inches (18
cm) in diameter.
- Sea urchins eat plant
and animal matter, including kelp, decaying matter, algae, dead
fish, sponges, mussels, and barnacles.
- Sea urchins are eaten
by snails, sea otters, crabs, sunflower stars, some birds, fish
(including wolf eels), and people.
- Fertilization of sea
urchin is external. Female Sea Urchins release several million tiny,
jelly-coated eggs at a time.
- Eggs or sperm are
released through five gonophores. As they develop, the tiny larvae
(called the pluteus, which have bi-lateral symmetry) swim in the sea
and are a component of zooplankton.
- It takes several
months for juvenile sea urchins to form. The time from fertilization
to a reproductive adult is from 2 to 5 years.
- Sea urchins are
creatures that live in oceans all over the world. Similar to sea
stars, sea urchins have a water vascular system.
- Their spherical shape
is typically small, ranging from about 3 cm to 10 cm in diameter,
and their body is covered with a spiny shell.
- A common place
to find a sea urchin is in coral reefs. Examples of where sea
urchins are very commonly found are on the reefs of Hawaii, of the
Caribbean and of Australia.
- Sea urchins have also
been reported to cause erosion of reefs in places such as the
eastern Pacific, Kenya and the Red sea.
- So although sea
urchins are important to the survival of an ecosystem, they can also
become dangerous in great numbers.
- Other family members
include the sea cucumber, sea star and sand dollar.
- Unfertilized egg,
Fertilized egg, Two cell stage, Four cell stage , Eight cell stage,
Sixteen cell stage, Thirty two cell stage, Morula stage, Blastula
stage, Gastrula stage, Pluteus larval stage are the stages of
Fertilization of Sea urchin.
- Urchins are prized for
their edible gonads, known as uni in Japan. High quality uni can be
worth as much as $80 or more per pound.
- The fishery in Maine
peaked in 1993 at around 40 million lbs. and employed over 1,800
people; by 2009 less than 5 million lbs. were harvested.
- 2010 Dock prices for
whole urchins exceeded $5/lb. during peak demand.
- Farming methods
include sea ranching, cage systems, and land based tank farms.
- Urchin gonad bulking,
holding for harvest on demand, and value added processing are all
ways to optimize a limited resource.
- The harmful effects of
sea urchins to the marine communities called for a reduction in
their numbers.
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General
- Basics of Sea
urchin
- General description
- Sea urchin
- Purple Sea urchin
- Red Sea urchin
Nutritional
Facts
- Nutritional
information for Sea urchin
- Wild fact - Sea
urchin
- Sea Urchins- Some
Sea Urchins Have Venomous Spines
- Sea urchin facts
- Facts about Sea
Urchin
- Sea urchin
nutritional information
- Nutritional facts
of a Sea urchin
Development
stages
- Life cycles - Sea
urchin development
- The Sea Urchin
- Growth model of the
reared sea urchin
- Sea Urchin
Development
- Sea urchin
fertilization and Development
- Introduction to Sea
Urchin Development
- Growth and age
structure of sea urchins
- Sea Urchin
Development
- The Development of
the Sea Urchin
Fertilisation
- Sea urchin
fertilization lab
- Sea urchin -
Reproduction
- Fertilization
stages
- Sea Urchin
Fertilization
- Fertilization of
Sea urchin
- Fertilisation
Videos on
Sea urchin Development
- Sea Urchin egg
developing until gastrula
- Sea Urchin
Development
-
Sea Urchin
Larval Development
-
The
Development of the Sea Urchin
-
Developing
Sea Urchins
Farming
- The future of
sea urchin culture
- Farming Sea
urchins
- Norway focuses
on sea urchin farming
- Sea Urchins and
Sushi: Farming the Fruits of the Sea
- How to Farm Sea
Urchins
- Norwegian sea
urchin fishing/farming
- Land-Based
Urchin Farming Gives Hope To The Industry
- Development of
artificial feeds to benefit sea urchin farming
Analysis
- FRAP analysis
of molecular diffusion inside sea-urchin spermatozoa
- Spindle
Microtubule Dynamics in Sea Urchin Embryos:
Analysis Using a Fluorescein-labeled Tubulin
- Analysis of
Carotenoids in Sea Urchins
- Proteomic
analysis of sea urchin (Strongylocentrotus purpuratus) spicule
matrix
-
Perseoartcheomic analysis of sea urchin (Strongylocentrotus
purpuratus) spicule matrix.
MSDS
- Fisher-Fresh
Preserved Specimens
- Phosbrite
- MetaGuard
- Sperm
Activating Peptide, Sea Urchin
- Toxin, sea
urchin, Tripneustes gratilla
Products
- Sea Urchin: One
of Sea Product at Tanah Lot
- Product list
- From
Ocean to Restaraunt
- Speciality
products
- Sea urchin
photo sculpture
- Sea
Urchin - Riccio by Terzani
- Monday
Moodboard - Sea Urchin
- Preserved
Starfish & Sea Urchins
Project
- Sea urchin
project
- Sea Urchin
Project, Lanzarote
- About Sea
urchin
- A sea urchin
genome project: Sequence scan, virtual
map, and additional resources
- Sea Urchin and
Marine Plants
Resource Identification-Bay of Islands
- The San Diego
Sea urchin project
- Relationships
among Egg Size, Composition, and Energy: A Comparative Study of
Geminate Sea Urchins
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Turnkey
service providers
- Small Hydro Power
Integrated and customized turnkey solutions
- Turnkey service
providers from Ireland
Suppliers
- Suppliers of Sea
urchin
- Manufacturers of
Sea urchin
- Selling leads of
Sea urchin
- Exporters of Sea
urchin
- Supplier from
California
- Supplier from U.S.A
- Online suppliers
Consultancy
- Consultancy from
Azores
- Consultancy from
Ireland
- Consultancy from
New Zealand
- Consultancy from
Missouri
- Consultancy from
Washington
- Consultancy from
U.S.A
- Online Consultancy
- Another online
Consultancy
Market
- Reducing
overgrazing by Sea urchin by market development
- Green Sea Urchin
- Sea Urchin Aquaculture
in the Gulf of Maine
- Uni and Selected Shellfish
Products in Japan and Hong Kong
- The Japanese Sea urchin market
- Pacific region Integrated fisheries
management plan
- The Sea Urchin Fishery:
Harvesting, Processing and the Market
- A New Fishery Develops
In California
- The next big splash in Irish aquaculture
- Sea Urchin Fishery and Overfishing
- UCC scientists exploit sea urchin market
Patent
- Urn having a sea
urchin shape
- Device for sea
urchins picking
- Processes for
inhibiting the growth of sea urchin eggs
- Process for
maintaining the freshness of raw sea urchin gonads
- Calcium containing
composition from sea urchin with high oral bioavailability
- Urchin deco pencil
sea urchin spine mounted choker charm
- Process for the
preservation of sea urchin gonads by quick freezing
Recipe
- Sea urchin recipes
- Sea Urchin food
recipes
- Sea Urchin Recipe
of the Week
- Sea urchin
bruschetta
- Spicy Spaghettini
With Sea Urchin and Tomatoes
- Sea urchin Linguine
- Cleaning and
Serving Sea Urchins
Report
- Earth's acid test
- Sea urchin injuries
to the hand
- Population
regulation of the purple Sea urchin at the California channel
islands
- Testing Two
Large-Mesh Sea Urchin Diver Catch Bags
- Sustainable Sea
urchins in Chile
- Relative Abundance
and Size Composition of Red Sea Urchin
- Growth model of the
reared sea urchin
- Sea urchin
Granuloma
Study
- Australian museum
scientific publications
- The role of
secondary mesenchyme cells during sea urchin gastrulation
studied by laser ablation
- Spikes of the Sea
urchin
- Benchmarked
Competitiveness Study of BC’s Sea Urchin Fisheries
- Purple Sea urchins
in and out of pits
- Development biology
through a model organism: Sea urchin
- The South African
sea urchin:
a candidate species for
aquaculture
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