Synodontis Grandiops – Lake Tanganyika Fish
Table of Contents
Synodontis Grandiops is a catfish species that is endangered, whose habitat is known to be only in the Democratic Republic of Congo, Burundi, and Tanzania, sides of Lake Tanganyika. It was first known to life by Jeremy John Wright and Lawrence M. Page in 2006, from samples collected in many places, along Lake Tanganyika. The name of the species is a Latin combination, with the word “grandi” which means “large”, and the Greek “ops”, which means eye, reference from this fish large eyes.
The Head and Surroundings
Like all fish of the genus Synodontis, Synodontis Grandiops has a strong head with a bone that extends from the back to the first dorsal fin spine. The fish’s head is approximately 3⁄10 of its whole body length. The head has a thin outer bone protruding, called the humeral process. The Synodontis Grandiops catfish size of the humeral process and its shape helps to identify species. In Synodontis Grandiops, the humeral process is slender, long, and has a rough look, and has a at the bottom has a distinct ridge. The upper edge is steep and ends at the sharp end. It is about 6⁄10 of the head length. The eyes are large, about 3/10 of the head length.
The fish has three pairs of barbels. Found on the upper jaw of the fish are maxillary barbels and mandibular barbels pairs at the bottom
jaw. Maxillary Barbel has no membranes near the stem and is straight without any branches. It extends at least to the stem of the pectoral fins, a large part of the head length. The outer pair of mandibular barbels extends almost to where the pectoral girdle is, about 1⁄2 of the head length, and has four to five branches without other secondary branches. The inner pair of mandibular barbels is about 1/2 to 2⁄3 in length as the outer pair, about 1⁄4 to 1⁄3 of the head length, with a pair of four to five branches without other secondary branches.
Fins and Skins
Synodontis Grandiops skin has a vast number of small sized folds on the skin. The exact purpose of the skin folds is unknown, but it is characteristic of Syndontis species found only in Lake Tanganyika. External papilla cells are absent.
The sharp front of the dorsal fins and pectoral fins for Syntontis species become hard and eventually sharp thorns. In Synodontis Grandiops, the thorn of the dorsal fin is long, about 7/10 of the head’s length, is relatively straight, has up to three small serrations at the front and many small serrations at the back, and ends with white filaments that are short. The remaining part of the pectoral fins, are made up of seven branches of rays. The pelvic gland is vertical in front of the adipose gland. The anal fin has three to four branches without branches and six to eight branches of rays; it stays upright with adipose tissue. The tail, or caudal fin, is divided into pointed areas, and has seven rays on the upper lobe, while lower lobe has eight rays.
The mouth of the fish is facing downward with very large lips that have a papilla. All Syndontis members have premaxillary toothpad structure, found at the upper jaw forefront. This structure consists of several rows of short, chisel-shaped teeth. For some species, this toothpad is made up of a large patch with several layers on a large group. On various Syndontis species, the toothpad is halved into two specific groups, separated by skin band that is very thin and divides the toothpad. This behavior is used as a way to distinguish among the various species, but similar species of Syndontis. In Synodontis Grandiops, the toothpad is not interrupted, or continues without a stop. On the lower jaw, or mandible, Syndontis teeth are attached to flexible structures, such as stems and are described as “s-shaped” or “trapped”. The mandible’s teeth number is used to distinguish the species, in Synodontis Grandiops, the mandible has 17-26 teeth, all located in a single row.
Various species of Synodontis are featured with opening series known as axillary pore found on the body sides under the humeral process and just close to the pectoral fins bone. The exact function of opening is unknown to scientists, although its presence has been observed in seven other species of catfish in general. Genus Acrochordonichthys fish have been illustrated to produce mucus that is toxic from their axillary pore, but there is no agreement or conclusion scientific wise in terms of the exact purpose of the mucus that is being extracted or vents. Synodontis Grandiops have a large, black axillary pore under the humeral process.
Synodontis Grandiops shares the characteristics of many Synodontis species, Lake Tanganyika species by having a recognizable structure with a black / dark triangle on the stem of all rays, except the anal and pelvic fins which are white, and black spots on the body, which may or may not go up to the abdomen. Body color can range from brown to sandy, black on the head and back. Barbels are white, the spines of the dorsal and pectoral fins are brown to black.
The maximum height of the known specimens is 11 centimeters (4.3 inches) and the total length of 15 centimeters (5.9 inches). In general in Synodontis species, females tend to be a bit bigger than males of similar age.
Environment and Behavior
In the wild, these species are found only on Lake Tanganyika, where the temperature is 23 to 26 ° C (73 to 79 ° F), with a pH of about 8.5 – 9, and a dH of 4-15. Synodontis species in the lake live mainly in rocky areas, as well as in sandy and areas that are covered with shells. The reproductive characteristics of many Synodontis species are unknown, with an exception of a few cases of egg counting from a females who were expecting to breed. Spawning can occur during the flood season between July and October, whereby pairs of Synodontis Grandiops usually swim together during hatching. In general, Synodontis species are omnivores, feeding on insect larvae, algae, snails, valves, sponges, crabs, and eggs of other fish. Growth rate is rapid in the first year, and then decreases as the fish becomes older.
For more articles related to lakes in Tanzania and their inhabitants click here!