Abalones reach sexual maturity at a small size, and
fertility is high and increases exponentially with size. Sexes are separate and
fertilization is external. The eggs and sperm broadcast into the water through
the pores with the respiratory current. A 1.5 inch abalone may spawn 10,000
eggs or more at a time, while an 8 inch abalone may spawn 11 million or more
eggs. The spawning season varies among species with black, green and pink
abalone spawning between spring and fall, and pinto abalone spawning during the
summer. Red abalone in some locations spawn throughout the year. The fertilized
eggs hatch into floating larvae that feed on plankton until their shells begin
to form. Once the shell forms, the juvenile abalone sinks to the bottom where
it clings to rocks and crevices with its single powerful foot. Settling rates
appear to be variable. After settling, abalones change their diet and feed on
macroalgae (http://seafood.ucdavis.edu/pubs/abalone.htm).
There are two species of abalone occur in Lombok, West Nusa
Tenggara: Haliotis asinina and Haliotis squamata. Limited growth information is available for abalones.
Commercial sizes of 5 until 8 inches. Lombok abalone reach about 8 inches in a
minimum of 1 years.
Juvenile abalones feed on rock-encrusting coralline algae
and on diatom and bacterial films. Adult abalones feed primarily on loose
pieces of marine algae drifting with the surge or current. Large brown algae
such as giant kelp, bull kelp, feather boa kelp and elk kelp are preferred,
although other species of algae may be eaten at various times. Abalone
eggs and larvae are consumed by filter-feeding fish and shellfish. Predators of
juvenile abalones include crabs, lobsters, gastropods, octopuses, seastars, and
fishes.
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2 komentar:
this is Mr Jang dari korea
Saya minta beli abalone Anda
minta kembali nomor telepon anda