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Untitled
by NASER786
Comments
2025 years ago
by carcarboris
What kind of fish is this?
2025 years ago
by jayakrishnanib@mail.com
Dear Naser,
Please go through the below description,
The shovelnose guitarfish, Rhinobatos productus,
is a ray that becomes sexually mature at an
estimated seven to eight years.
Males are between 90–100 cm, while females
are around 99 cm at this time.
The ray can live up to 11 years,
and full grown sizes are around 120 cm
for males, and females reach
sizes of 137 cm.[1] Their habitat
ranges from central California
down to the Sea of Cortez.
While remaining the same species, there is
a morphological and genetic variation in the
mitochondrial DNA in those found in the Sea
of Cortez, evidencing the isolation
from the rest. The shovelnose is considered
to be a primitively developed ray, with many
features of both sharks and rays. Because of
this, the conservation of this species must be
carefully managed to preserve the biological
diversity.[2]
The Rhinobatos productus has magnetic
particles in the vestibular receptors,
and it is presumed that the magnetic
particles are exogenous in origin.
he magnetic particles have a spatial
arrangement that may aid in the sensitivity
of the receptors to movements, but additional
research is required.[3]
The visual system of the shovelnose is
more extensive and developed than other
Elasmobranchii, with multiple large projections
connecting to the brain. Almost the entire
dorsal and ventral hypothalamus is connected
to the visual system, but still maintains a
similar lack of differentiation as with sharks.
This species has had one documented case of an
attack on a diver when a male guitarfish
was interrupted during mating. Due to the
tooth structure of the guitarfish, this attack
could have resulted in a "gumming" at worst.
A 32 inch shovelnose guitarfish caught in the
surf at San Diego.
Shovelnose ray was first considered to
be a shark because of its dorsal fin's shape.
Regards
JK
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