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 Profiles Malawi Haplochromines Placidochromis johnstoni
Placidochromis johnstoni
Scientific Name: Placidochromis johnstoni
Pronunciation: pl-sd--kr-ms
Geo. Origin: Lake-wide distribution
Habitat: Shallow muddy bays, sandy habitat, and intermediate habitat
Diet: Carnivore
Gender Differences: Dimorphic
Breeding: Maternal Mouthbrooder
Temperament: Peaceful
Conspecific Temperament: Mildly Aggressive
Maximum Size: 7.5"
Temperature: 78 - 82°F
pH: 7.8 - 8.6
Water Hardness: Hard
Difficulty: 2
Photo Credit: Hisao Masui
P. johnstoni is a "common find" in muddy, shallow bays, especially in association with plant beds. It often forages in mixed species groups but is also found in groups of its own kind, numbering as many as 50! In these groups, a single male will express breeding coloration (similar to F. rostratus). This cichlid often joins N. polystigma to hunt small fry but also feeds on invertebrates. It has a unique and interesting hunting behavior: They plunge their heads deep down into a plant bed and quickly snap their mouth shut. The result is a squirt of water that disturbs the fine layer of sediment covering the leaves - exposing invertebrates. It also performs this "trick" on sediment covered rocks in the intermediate habitat. The result here is a bit different. The stirred up sediment attracts small mbuna who then fall prey to the predator.
 Profiles Malawi Haplochromines Placidochromis johnstoni
 Key To Species Profile Terms
 Pronunciation: Refer to our Pronunciation Key for an explanation of the phonetic symbols.
 Habitat: This is the primary location where the cichlid is found and is a generalization. This does not
  mean a fish cannot be found in other habitats.
 Diet: Many cichlids specialize in eating one type of food; notwithstanding, some of these specialized
  feeders are flexible and can be opportunistic feeders.
 Temperament: This describes the overall demeanor of a cichlid toward other tankmates that
  are of a different species. Consider that there is variability in temperament due to various factors,
  including aquarium size, tankmates of similar appearance, stocking levels, and order of introduction.
  There may even be some variability among individual specimens.
 Conspecific Temperament: This describes the overall demeanor of a cichlid toward other tank-
  mates of the same species. Consider that there is variability in temperament due to such factors as
  aquarium size, stocking levels and order of introduction. There may even be some variability among
  individual specimens.
 Maximum Size: This is in regards to total length (including the tail) of typical aquarium specimens.
  Wild specimens may not attain this size, or may in fact grow larger than aquarium raised individuals
  due to various factors. Also consider that this is the typical maximum size and there are exceptional
  individuals that will exceed it.
 Difficulty: This measure is a relative value, comparing a single species against all other cichlids.
  This only accounts for maintanence in the aquarium and not breeding considerations.
  1 = easy and forgiving, 5 = extremely challenging.
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