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Choranthias salmopunctatus, Salmon-spotted jewelfish
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Choranthias salmopunctatus
Picture by
Luiz, Jr., O.
Teleostei (teleosts) >
Perciformes/Serranoidei
(Groupers) >
Anthiadidae
(Fairy basslets or Streamer basses)
Etymology:
Choranthias:
Name from Greek 'chora' for room or space and 'anthias' meaning a seafish; an allusion to the interruption of the lateral line in the species of this genus.
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; demersal; depth range 30 - 55 m (Ref.
58184
). Tropical
Eastern Central Atlantic: endemic to St. Paul's Rocks.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 6.1 cm SL male/unsexed; (Ref.
13121
)
Short description
Morphology
|
Morphometrics
Dorsal
spines
(total): 10;
Dorsal
soft rays
(total): 15;
Anal
spines
: 3;
Anal
soft rays
: 7. This species distinguished from it congeners by the following set of characters: A 7; 46-51 lateral-line scales; total gill rakers on first arch 32-35 (Ref.
90266
).
This species, which was seen again at St. Paul's Rocks after almost 30 years of its first description, was observed between 35 and 55 m and was most abundant between 40 and 45 m on almost-vertical rock drop offs. It aggregates in small groups of 5 to 10 individuals, swimming close to crevices into which they hide when threatened. Several such groups were observed, with each group taking refuge in its own crevice when approached by a diver. Apparently, there is no exchange of individuals between groups or crevices, suggesting that appropriate shelter is one of the factors limiting the distribution of this species. Individuals were observed to leave a shelter only when a school of juvenile
Chromis multilineata
(Guichenot, 1853) approached the cliffs. Both species are quite similar in shape and, at depths with available light, are almost identical in coloration (faded-brown). Presumably,
A. salmopunctatus
gets protective advantages of schooling with a similar species in larger, multispecific groups while foraging on open water plankton. Although neither
A. salmopunctatus
nor other endemic fishes in the area may be under great risk of extinction (as their habitat is not directly affected by human activities), such extreme restricted geographic distribution is sufficient to consider the species threatened, as they could be vulnerable to natural impacts.
A. salmopunctatus
and
Prognathodes obliquus
have been reported show low densities and seem to have low absolute numbers. The latter may be a bias due to the fact that only the shallow portion of the depth range is being sampled or, alternatively, the species really have low population densities. A precise evaluation of the risks of extinction urgently requires extensive work to better estimate the distribution and population size of this species (Ref.
58184
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Lubbock, R. and A. Edwards
, 1981. The fishes of Saint Paul's Rocks. J. Fish Biol. 18(2):135-157. (Ref.
13121
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
10 June 2013
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Zoological Record
Estimates based on models
Preferred temperature (Ref.
123201
): 26.3 - 27.3, mean 27.3 °C (based on 3 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Trophic level (Ref.
69278
): 3.3 ±0.4 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153
): Low vulnerability (10 of 100).
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mrius-barile
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