''Synodontis grandiops'' is a species of
upside-down catfish
The name upside-down catfish is most commonly used by aquarists to refer to the mochokid catfish '' Synodontis nigriventris'' alternately known to ichthyologists as the blotched upside-down catfish or false upside-down catfish. However, a number ...
endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...
to the
Democratic Republic of the Congo
The Democratic Republic of the Congo (french: République démocratique du Congo (RDC), colloquially "La RDC" ), informally Congo-Kinshasa, DR Congo, the DRC, the DROC, or the Congo, and formerly and also colloquially Zaire, is a country in ...
,
Burundi
Burundi (, ), officially the Republic of Burundi ( rn, Repuburika y’Uburundi ; Swahili language, Swahili: ''Jamuhuri ya Burundi''; French language, French: ''République du Burundi'' ), is a landlocked country in the Great Rift Valley at the ...
, and
Tanzania
Tanzania (; ), officially the United Republic of Tanzania ( sw, Jamhuri ya Muungano wa Tanzania), is a country in East Africa within the African Great Lakes region. It borders Uganda to the north; Kenya to the northeast; Comoro Islands and ...
, where it is only known from
Lake Tanganyika
Lake Tanganyika () is an African Great Lake. It is the second-oldest freshwater lake in the world, the second-largest by volume, and the second-deepest, in all cases after Lake Baikal in Siberia. It is the world's longest freshwater lake. ...
.
[ It was first described by ]Jeremy John Wright
Jeremy may refer to:
* Jeremy (given name), a given name
* Jérémy, a French given name
* Jeremy (film), ''Jeremy'' (film), a 1973 film
* Jeremy (song), "Jeremy" (song), a song by Pearl Jam
* Jeremy (snail), a left-coiled garden snail that died i ...
and Lawrence M. Page
Lawrence may refer to:
Education Colleges and universities
* Lawrence Technological University, a university in Southfield, Michigan, United States
* Lawrence University, a liberal arts university in Appleton, Wisconsin, United States
Preparator ...
in 2006, from specimens collected at multiple points along the shore of Lake Tanganyika.[ The ]species name
In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...
is a Latinized combination of the Latin "''grandi''", meaning large or big, and the Greek "''ops''", meaning eye, a reference to the relatively large eyes of this fish.[
]
Description
Like all members of the genus ''Synodontis'', ''S. grandiops'' has a strong, bony head capsule that extends back as far as the first spine of the dorsal fin.[ The head is about of the ]standard length
Fish measurement is the measuring of individual fish and various parts of their anatomies. These data are used in many areas of ichthyology, including taxonomy and fisheries biology.
Overall length
* Standard length (SL) is the length of a fish m ...
of the fish.[ The head contains a distinct narrow, bony external protrusion called a humeral process.][ The shape and size of the humeral process help to identify the species. In ''S. grandiops'', the humeral process is narrow, long, and rough in appearance, and contains a distinct ridge on the bottom surface.][ The top edge is convex and it ends in a sharp point.][ It is almost of the length of the head.][ The eyes are large, about of the length of the head.][
The fish has three pairs of ]barbels
In fish anatomy and turtle anatomy, a barbel is a slender, whiskerlike sensory organ near the mouth. Fish that have barbels include the catfish, the carp, the goatfish, the hagfish, the sturgeon, the zebrafish, the black dragonfish and some ...
. The maxillary barbels are located on the upper jaw, and two pairs of mandibular barbels are on the lower jaw. The maxillary barbel does not have a membrane near the base and is straight without any branches.[ It extends at least as far as the base of the pectoral fin, most of the length of the head.][ The outer pair of mandibular barbels extends just short of the pectoral girdle, about of the length of the head,][ and contains four to five branches without secondary branches.][ The inner pair of mandibular barbels is about to as long as the outer pair, about to of the length of the head,][ with four to five pairs of branches without secondary branches.][
The skin of ''S. grandiops'' has a large number of tiny vertical skin folds. The exact purpose of the skin folds is not known, but is a characteristic of the species of ''Syndontis'' that are endemic to Lake Tanganyika.][ External granular ]papilla
Papilla (Latin, 'nipple') or papillae may refer to:
In animals
* Papilla (fish anatomy), in the mouth of fish
* Basilar papilla, a sensory organ of lizards, amphibians and fish
* Dental papilla, in a developing tooth
* Dermal papillae, part of ...
are not present.[
The front edges of the dorsal fins and the pectoral fins of ''Syntontis'' species are hardened into stiff spines.][ In ''S. grandiops'', the spine of the dorsal fin is long, about as long as the head,][ is almost completely straight, contains up to three small serrations on the front and many small serrations on the back, and ends with short, white filaments.][ The remaining portion of the dorsal fin is made up of seven branching rays.][ The spine of the pectoral fin is slightly curved, roughly as long as the dorsal fin spine, with large serrations on both sides.][ The pectoral spine ends in short, white filaments.][ The other pectoral fins are made up of eight branching rays.][ The adipose fin is short, does not contain any rays, and has a convex shape.][ The pelvic fin contains one unbranched and six branched rays.][ The pelvic fin is vertically aligned in front of the adipose fin.][ The anal fin contains three to four unbranched and six to eight branched rays; it is vertically aligned with the adipose fin.][ The tail, or caudal fin, is forked, with pointed lobes, and contains seven rays on the upper lobe, eight rays on the lower lobe.][
The mouth of the fish faces downward and has wide lips that contain ]papilla
Papilla (Latin, 'nipple') or papillae may refer to:
In animals
* Papilla (fish anatomy), in the mouth of fish
* Basilar papilla, a sensory organ of lizards, amphibians and fish
* Dental papilla, in a developing tooth
* Dermal papillae, part of ...
.[ All members of ''Syndontis'' have a structure called a premaxillary toothpad, which is located on the very front of the upper jaw of the mouth. This structure contains several rows of short, chisel-shaped teeth. In some species, this toothpad is made up of a large patch with several rows in a large cluster. In other species of ''Syndontis'', this toothpad is clearly divided into two separate groups, separated by a thin band of skin that divides the toothpad.][ This character is used as a method of differentiating between to different but similar species of ''Syndontis''.][ In ''S. grandiops'', the toothpad is uninterrupted, or continuous without a break.][ On the lower jaw, or mandible, the teeth of ''Syndontis'' are attached to flexible, stalk-like structures and described as "s-shaped" or "hooked".][ The number of teeth on the mandible is used to differentiate between species; in ''S. grandiops'', there are 17-26 teeth on the mandible, arranged in a single row.][
Some of the species of ''Synodontis'' have an opening or series of openings called the axillary pore. It is located on the side of the body below the humeral process and before the pectoral fin spine. The exact function of the port is not known to scientists, although its presence has been observed in seven other catfish genera. Fish in the genus ''Acrochordonichthys'' have been observed to secrete a mucus with toxic properties from their axillary pore, but there is no scientific consensus as to the exact purpose of the secretion or the pore.][ ''S. grandiops'' has a large, dark-colored axillary pore just below the humeral process.][
''S. grandiops'' shares the characteristic of most of the ''Synodontis'' species of Lake Tanganyika by having a recognizable pattern consisting of dark triangles at the bases of all of the rayed fins, except the anal and pelvic fins which are white, and dark spots on the body that may or may not extend to the belly.][ The body ranges from light brown to beige, becoming darker on the head and back.][ The barbels are white, the dorsal and pectoral fin spines are brown to black.][
The maximum ]standard length
Fish measurement is the measuring of individual fish and various parts of their anatomies. These data are used in many areas of ichthyology, including taxonomy and fisheries biology.
Overall length
* Standard length (SL) is the length of a fish m ...
of known specimens is and a total length
Fish measurement is the measuring of individual fish and various parts of their anatomies. These data are used in many areas of ichthyology, including taxonomy and fisheries biology.
Overall length
* Standard length (SL) is the length of a fish ...
of .[ In general in ''Synodontis'' species, females tend to be slightly larger than males of the same age.][
]
Habitat and behavior
In the wild, the species is endemic to Lake Tanganyika
Lake Tanganyika () is an African Great Lake. It is the second-oldest freshwater lake in the world, the second-largest by volume, and the second-deepest, in all cases after Lake Baikal in Siberia. It is the world's longest freshwater lake. ...
, which has a temperature range of , and an approximate pH of 8.5 – 9, and a dH range of 4-15.[ ''Synodontis'' species in the lake tend to inhabit mainly the rocky shoreline areas, as well as sandy and shell-covered bottom areas.][ The reproductive habits of most of the species of ''Synodontis'' are not known, beyond some instances of obtaining egg counts from gravid females.][ Spawning likely occurs during the flooding season between July and October, and pairs swim in unison during spawning.][ As a whole, species of ''Synodontis'' are omnivores, consuming insect larvae, algae, gastropods, bivalves, sponges, crustaceans, and the eggs of other fishes.][ The growth rate is rapid in the first year, then slows down as the fish age.][They practice brood parasitism.They lives among rock piles frequented by various species of mauna: small African cichlids. Courtship behaviour culminates with the female sucking sperm from the male's cloaca. She brings the sperm through her digestive tract to her cloaca, where her eggs meet the sperm.They then rushes into the nest of a cichlid,devours the eggs of cichlids,and deposits their own.The cichlids then raise the catfish as their own.
]
References
External links
{{DEFAULTSORT:Synodontis Grandiops
grandiops
Freshwater fish of Africa
Fish of Lake Tanganyika
Fish of Burundi
Fish of Tanzania
Fish of the Democratic Republic of the Congo
Fish described in 2006