he fourth month of the
new decade (2010) brings us to another indepth look
from the catfish world from regular contributor, aquarist
and author, Chris Ralph. His subject this month is
the Leopard Catfish. I now hand you over to Chris.
Perrunichthys
perruno (now Leiarius perruno 2020)
belongs to the family Pimelodidae or Long-whiskered
catfishes from South America and is documented as
being native to Venezuela and Colombia from the Rio
Negro system. The type locality for this catfish is
documented as being the Rio Negro below the mouth
of the Rio Yasa, 75km south of Rosario on the west
side of Lake Maracaibo, Venezuela, hence the reference
to this catfish occurring in the Lake Maracaibo basin.
Leiarius
perruno
The
fact that this catfish has distinctive markings and
very long maxillary barbels make it easily identifiable.
Leiarius perruno is sometimes confused with
Leiarius
pictus (Sailfin pimelodid)
and Leiarius
marmoratus (Marble
antenna catfish).
Leiarius perruno
is a predatory fish in its natural habitat, feeding
upon any unsuspecting fish which happen to get in
the way of its relatively large cavernous mouth. Whilst
these are magnificent fish to observe they are not
ideally suited to life in captivity, unless being
looked after in a large Public Aquarium. It is suggested
that the scientific name is derived from the local
name of ‘bagre perruno’ by the local people
of the Maracaibo basin (bagre is the South American
name for a catfish). I have kept a number of these
catfish over the years and have noted that they can
fast for periods of time which can be slightly worrying
when this happens, and tends to coincide after having
a particularly heavy meal. The longest fast lasted
4 weeks.
Leiarius
perruno- holotype as Perrunichthys
perruno
Leiarius perruno
prefer to be kept in water which has pH in the range
of pH 6.0 -7.2 and hardness up to 18ºdGH. This
catfish is ideally suited to temperatures in the range
of 22-26ºC or 72-79ºF. It does not tolerate
poor water quality, and it very important to ensure
optimum conditions are provided when keeping this
species.
I would suggest
a minimum size of 72”x 24”x 24”for
an 18”specimen. Anything over this size I would
suggest a very large purpose built aquarium or a heated
tropical pond, or better still if you are unable to
provide adequate accommodation in the first place
please do not attempt to keep this monster catfish,
magnificent as it is. As with all other species of
fish, water quality and general husbandry is very
important, especially so with large predatory fish
such as this species and I would recommend that a
minimum of 25% water is changed on a weekly basis.
EDITOR:
This has been an update in 2020. Still named in most
online sources as Perrunichthys perruno but
it is now valid as a synoynm of L. perruno.
Not confirmed most likely Pimelodidinae/Sorubiminae.
Distribution
South
America: Venezuela and Colombia from the
Rio Negro system. The type locality for this catfish
is documented as being the Rio Negro below the mouth
of the Rio Yasa, 75km south of Rosario on the west
side of Lake Maracaibo, Venezuela.
Size
600mm+ or 24”+ s.l. (standard
length – this is the measurement of the fish
from the tip of the snout to the base of the caudal
peduncle).
Temp.
22-26°C
(72-79°F)
p.H.
6.0-7.2.
Characteristics
With regard to the anatomical
characteristics of Leiarius perruno the head
is described as being greatly depressed, with a broad
snout and wide sub-terminal mouth. The body is described
as being elongate and naked. The upper jaw is described
as being slightly longer than the lower jaw. The maxillary
barbels in adult specimens are described as being
long, extending to the caudal fin. This catfish has
two pairs of shorter mandibular barbels. The dorsal
fin is described as having 7 soft rays. The caudal
fin is described as being large and deeply forked.
Colouration
The overall base body colour
of Leiarius perruno is described as being
dark chocolate brown with lighter reticulated markings
on the body and fins. The underside of this catfish
is much lighter in colour. The barbels have annulated
markings sharing the same body colouration. In some
specimens it has been noted that the dorsal and paired
fins can sometimes be spotted as opposed to being
reticulated in terms of colour pattern.
Aquarium
Care & Compatibility
Wherever possible I would recommend
that the aquarist keep these catfish in a species
only aquarium as individual specimens. This catfish
should not be kept with small species of fish as they
will be eaten! This catfish can be kept with other
large catfish such as Pseudodoras niger/Oxydoras
niger, Pterodoras granulosus, Megalodoras
uranoscopus (formerly M. irwini), Oscars
and larger characins.
Reproduction
There are no documented
reports of successful aquarium spawnings of Leiarius
perruno, this is most likely due to the size
that these fish can attain and hence the subsequent
size of aquarium in which to spawn them.
Sexual
Differences
Generally unknown
although there are some thoughts on this subject;
the males tend to be more slender than females especially
noticeable when these catfish are in breeding condition.
Diet
Fish and crabs are documented
as being amongst the food types consumed by Leiarius
perruno in the wild. In an aquarium this catfish
can be persuaded to eat pieces of dead fish, prawns,
mussels, earthworms, and can even be persuaded to
eat sinking catfish pellets. This catfish is described
as being piscivorous in terms of its natural diet
of fish.
Glossary
of Terms
Adipose is
defined as a second dorsal fin. Anal fin is defined as the medial
fin immediately posterior to the anus. Annulated is defined as having rings
or belts. Caudal fin is defined as the tail
fin. Dorsal fin is defined as the medial
fin on top of the back. Depressed is defined as flattened
from top to bottom. Mandibular is defined as being in
relation to the mandible or lower jaw. Maxillary is defined as being in
relation to the maxilla, the bone of the upper jaw. Pectoral fins
are defined as paired lateral fins. Sub-terminal is defined as being
just below Ventral fins
are defined as the paired fins between the
pectoral and anal fins.
Etymology
Leiarius:Smooth.
perruno:Spanish meaning
canine and Greek ichthys meaning fish. It is documented
that the full name of this species is dogfish; dog
presumably in reference to its unfussy and gregarious
eating habits.
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