Parotocinclus cearensis
Parotocinclus cearensis was first scientifically described by Julio C. Garavello in 1977. His publication in the “Arquivos de Zoologia” was an important revision of the genus Parotocinclus, in which he not only redefined existing species but also introduced five new species, including P. cearensis.
No common name is known for this species.
This fascinating fish belongs to the Loricariidae family, a large group of armored catfish known worldwide for their armored bodies and specialized suction mouths. Within this family, Parotocinclus cearensis is classified in the Hypoptopomatinae subfamily. The genus Parotocinclus itself was originally described in 1889 by Eigenmann & Eigenmann as a monotypic subgenus (a subgroup within a genus that contains only one species) of Hisonotus. A year later, in 1890, they elevated Parotocinclus to a full genus, mainly because of the presence of an adipose fin (a small, fleshy fin without fin rays, located between the dorsal fin and the caudal fin).
The genus name Parotocinclus is derived from Greek. The prefix “para” means “on the side of,” “ous” or “otis” stands for “ear,” and “kygklos” or ‘ou’ means “a fish.” The species name cearensis is a direct reference to the geographical origin of the fish. The species is named after the Brazilian state of Ceará, where the type locality (the place where the first specimen of the species was found and described) Cachoeira do Gusmão near Ipu is located. The species is also known from the Rio Acaraú and Choró basins in the same state.
Description
Parotocinclus cearensis is a compact fish with a maximum total length of about 5 to 6 centimeters. Its body is broad and somewhat flattened, especially the head, which is broad and compressed. The profile of the back, from the snout to the beginning of the dorsal fin, is slightly convex (curved outward).
A striking feature of the genus Parotocinclus, and therefore also of P. cearensis, is the presence of an adipose fin. This distinguishes them from the closely related genus Otocinclus. The caudal peduncle (the part of the body between the dorsal fin and the caudal fin) has an elliptical cross-section.
The head of the fish is covered with small rows of teeth, called denticles, on the supraoccipital and frontal bones, which are bones in the skull at the top and back of the head. The teeth on the underside of the snout edge are as small as those on the upper body armor plates. The eyes are located almost at the top of the head.
In terms of armour, Parotocinclus cearensis has 23-24 plates along the lateral line. The belly is largely uncovered, with only a single row of small plates on each side and a group of irregularly scattered plates in the area in front of the anal fin.
The color pattern of Parotocinclus cearensis follows the typical pattern of the subfamily Hypoptopomatinae. This generally means a dark brown band on each side, running from the snout to the tail root. The back between these lateral bands is light gray and the belly is yellowish. The tail root may be black-spotted on the underside. There are often four transverse bands on the back: one in front of and one behind the dorsal fin, and one in front of and one behind the anal fin. Sometimes there are only three bands: one below the dorsal fin and the others in front of and behind the anal fin. Specific to P. cearensis is that the caudal fin has black dots only on the fin rays, while the membranes (the skin between the fin rays) are transparent. There are three dark stripes crossing the caudal fin, with the two rear ones being wider than the first.
Differences between Males and Females
The physical differences between males and females of Parotocinclus cearensis are subtle but noticeable. Females are generally slightly plumper in build, especially when carrying eggs. Males, on the other hand, have a slimmer body shape. No specific behavioral differences between the sexes are described in the literature.
Differences between Juveniles and Adults
Within the genus Parotocinclus, young specimens (juveniles) often exhibit characteristics that disappear in adult fish. For example, immature fish may have ridges or depressions on their heads that partially or completely disappear as they age. Young specimens also generally have an uncovered belly, although some species, depending on their stage of development, may develop plates on the side of the belly. This can make it difficult to identify young fish, as the characteristics used for adult fish are not yet fully developed or consistent.
Behavior and Temperament
This is an extremely peaceful fish species. They are not aggressive and can coexist very well with other small, calm fish, such as small salmon, dwarf barbs, and dwarf shrimp.
These fish are naturally reserved and somewhat shy. They do not pay much attention to each other. During the day, they usually hang from the ceiling in their cave. They are most active at dusk and at night. It is important to avoid hectic or rough tank mates, as this can cause stress for Parotocinclus cearensis.
They are typical bottom dwellers and spend most of their time grazing algae from surfaces. In their natural habitat, they attach themselves to roots, rocks, and plants, where they scrape off algae deposits with their specialized suction mouth. They continue this behavior in the aquarium, where they play a useful role in natural algae control.
Biotope
Parotocinclus cearensis is a fish species that occurs naturally in the waters of Brazil. Specifically, this species is endemic (meaning it only occurs there) to the state of Ceará in northeastern Brazil. The type location, the place where the species was first found and described, is Cachoeira do Gusmão near Ipu, located in the state of Ceará.
This is a typical river dweller and is found in clear, well-flowing rivers in the Ceará region. They live in shallow, sun-drenched waters.
The natural habitat of Parotocinclus cearensis is characterized by a substrate consisting of sand or stones. The fish like to attach themselves to roots, rocks, and plants present in these waters. There are therefore plenty of objects in the water to which they can cling and graze on algae. The presence of “sun-drenched waters” and the preference for plants and roots indicates a habitat with both open, light areas and hiding places.
Diet
The diet of the Parotocinclus cearensis is closely linked to its natural behavior and its role in the ecosystem. This small armored catfish is primarily a specialized algae eater, both in the wild and in the aquarium.
What does this fish species eat in the wild?
In its natural habitat, the clear and well-flowing rivers of the Ceará region in Brazil, Parotocinclus cearensis feeds mainly on algae growth (Aufwuchs). With its specialized suction mouth, it tirelessly scrapes algae deposits and biofilms (a layer of microorganisms) from surfaces such as roots, rocks, and aquatic plants. This natural grazing behavior is important for its survival and contributes to the cleaning of its environment.
What do you feed this fish species in the aquarium?
In the aquarium, it is important to mimic the natural diet of the Parotocinclus cearensis as closely as possible. They are classic Aufwuchs eaters and will actively graze algae and biofilms from all surfaces in the aquarium. A well-established aquarium with sufficient natural algae growth is therefore the ideal environment for these fish.
To supplement their diet and ensure they get all the nutrients they need, you can offer the following foods:
- Vegetable pellets and tablets: High-quality algae pellets or tablets specially designed for algae-eating catfish are an excellent staple food.
- Blanched vegetables: Pieces of blanched vegetables, such as zucchini, spinach, or cucumber, are highly appreciated. These can be attached to a stone or secured to the glass with a feeding clip.
- Low-protein frozen food: Occasionally, the diet can be supplemented with small, low-protein frozen food, such as Artemia nauplii (young brine shrimp). When feeding such fine food particles, it is advisable to switch off the filter briefly so that the food is not sucked up immediately and the fish have a chance to eat it.
- Leaf litter: The addition of dried leaf litter, such as catappa leaves or oak leaves, can also be beneficial. These leaves not only provide hiding places, but also form a food source as they break down and develop biofilms.
The Aquarium
Successfully keeping Parotocinclus cearensis in an aquarium requires attention to detail and mimicking their natural habitat. As an experienced aquarium keeper, I am happy to help you with the right setup and care.
This species eats large amounts of algae fairly quickly. One or two specimens in a 60-centimeter aquarium will quickly graze away the algae. If you really want to keep a group that can graze algae naturally, a much larger aquarium is needed. These fish are small and do not need a huge swimming space, but they do appreciate the opportunity to graze on different surfaces.
The Aquarium
The setup of the aquarium is crucial for the well-being of Parotocinclus cearensis. They are naturally bottom dwellers and algae eaters, and the setup must be tailored to this:
- Lots of roots and smooth stones: These fish like to attach themselves to surfaces to graze on algae. Provide plenty of root wood (such as driftwood or mangrove wood) and smooth stones that they can scrape.
- Dense planting: Dense planting is very beneficial. Plants such as Anubias and Java ferns are ideal, as they provide extra surface area for algae growth and the fish like to rest and graze on them.
- Light attenuation: Floating plants are also a good addition. They attenuate the light entering the aquarium, which makes the shy Parotocinclus cearensis feel safer and reduces stress.
- Hiding places: In addition to plants and roots, they also appreciate other hiding places where they can retreat. Think, for example, of a number of caves between some rocks.
Substrate
Sand or fine gravel is the best choice for the substrate (ground cover). This mimics their natural habitat, where they live on sandy or stony ground. A soft bottom is also safer for their sensitive mouthparts when they search the bottom for food.
Water parameters
Parotocinclus cearensis thrives best in soft to medium-hard water with a pH value between 6.0 and 7.5. The optimal water temperature for this species is between 22 and 27 °C. Maintaining good water quality through regular water changes is essential for their health and well-being.
Suitable Tank Mates
This is an extremely peaceful fish species and can be kept together with other calm aquarium inhabitants.
- Suitable tank mates: They can live well with small salmon, dwarf barbs, and dwarf shrimp. These species are not aggressive and will not disturb the Parotocinclus cearensis.
- Unsuitable tank mates: It is important to avoid busy or rough tank mates. Because Parotocinclus cearensis is naturally shy, busy or aggressive fish can cause stress, which can negatively affect their health. Therefore, avoid large, territorial, or very active fish that may intimidate this species.
Breeding Parotocinclus cearensis
I have not been able to find any information about breeding Parotocinclus cearensis. If you have any additional information about breeding this species, I would love to hear from you!
Particularities
In addition to the aspects of Parotocinclus cearensis already discussed, there are a few interesting features that make this species unique and worth mentioning. These details provide a deeper insight into their biology and their place in both nature and the aquarium hobby.
- Facultative Air Breathers: A remarkable physiological characteristic of the genus Parotocinclus, to which P. cearensis belongs, is their ability to breathe air facultatively. This means that these fish are able to take oxygen directly from the air when oxygen levels in the water are low. This is an important adaptation that helps them survive in habitats where water quality temporarily deteriorates, for example due to drought or high temperatures.
- Relative obscurity in aquatics: Despite their qualities as diligent algae eaters, Parotocinclus species, including P. cearensis, lead a somewhat “shadowy existence” in the aquarium hobby. They are relatively unknown compared to their close relatives from the genus Otocinclus, which are much more popular. This is unfortunate, as they are equally effective at controlling algae and can be a charming addition to a community aquarium.
- Challenging Species Identification: Identifying the different species within the genus Parotocinclus is extremely difficult. At least 30 species have been described, and the subtle differences make it challenging even for experts to name them correctly. This may explain why they are less commonly offered specifically in the trade.
- Behavior: Lively and Less Shy Although previously described as somewhat shy, there is also an observation that Parotocinclus cearensis can be lively and not very shy in a well-decorated aquarium. This suggests that their shyness may decrease when they feel safe and comfortable in a suitable environment with sufficient hiding places and conspecifics.
- Classification in the maculicauda group: The scientist Garavello, who first described P. cearensis, divided the genus Parotocinclus into two groups based on the size of the denticles (small tooth-like structures) on their body and snout. Parotocinclus cearensis belongs to the P. maculicauda group. This group is characterized by fish with large, strong denticles that attach themselves to submerged riparian vegetation. This detail underscores their specialized adaptation to their natural habitat.
- Systematic Complexity of the Genus: At a higher taxonomic level, the genus Parotocinclus is currently classified as non-monophyletic. This means that the current classification does not include all descendants of a common ancestor, indicating a complex evolutionary history. Scientific reviews are ongoing, and it is possible that new genera will be designated in the future to better reflect the true evolutionary relationships within this group.
- Large swim bladder capsule: A specific anatomical feature of Parotocinclus cearensis is the large opening of the swim bladder capsule. This opening is as wide as the diameter of the eye and half as high. This detail may be related to their ability to breathe air and is a distinguishing feature from other closely related species.
Frequently asked questions / FAQ
Where does Parotocinclus cearensis come from and what does it look like?
Parotocinclus cearensis originates from Brazil, specifically the state of Ceará and the Rio Salgado. It is a small, stocky catfish measuring up to 6 cm, brown/yellow in color with dark spots and a distinctive sucker mouth.
How large does a Parotocinclus cearensis become and which aquarium is suitable?
This small catfish grows to a maximum length of 6 cm. An aquarium with a minimum length of 60 cm is suitable for a group of Parotocinclus cearensis. They need sufficient space to forage and hide.
Which water values are ideal for the Parotocinclus cearensis?
The water temperature should be between 22-26°C. The pH value is ideally between 6.0 and 7.5. They thrive best in soft to medium-hard water, which mimics their natural habitat.
What does a Parotocinclus cearensis eat in an aquarium?
Parotocinclus cearensis is an algae eater. Feed them algae wafers, spirulina, and vegetables such as cucumber or zucchini. Occasionally, you can offer small live or frozen food, such as cyclops or artemia, as a supplement.
Can the Parotocinclus cearensis live together with other fish?
Yes, they are peaceful schooling fish and should be kept in a group of at least 5-6 specimens kept be. Combine them with other peaceful, non-aggressive fish that prefer similar water values prefer and are not too large in size.
How do I set up an aquarium for Parotocinclus cearensis?
Use a substrate of fine sand or gravel. Provide plenty of hiding places with wood, stones, and dense vegetation. Subdued lighting is appreciated, possibly with floating plants. This mimics their natural habitat.
Is it possible to breed Parotocinclus cearensis in an aquarium?
The breeding of Parotocinclus cearensis in theThey are egg layers, but specific breeding protocols for a16> home aquariums are not generally known.
Is the Parotocinclus cearensis suitable for novice aquarists?
Yes, Parotocinclus cearensis is suitable for novice aquarists, provided that their specific requirements for water values, diet, and group size are met. They are peaceful and relatively easy to care for.
Author
Since I bought my first second-hand aquarium when I was twelve, I have always had one or more aquariums. I even converted a garage into a breeding room where I had 50 aquariums containing around 10,000 liters of water. At the moment, I have two aquariums: a 1,250-liter Tanganyika aquarium and a 250-liter community aquarium with plants. For the past 10 years, I have been working on this website as a writer and photographer.
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