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Galapagos Damsel

Azurina eupalama Heller & Snodgrass 1903

Conservation Status

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Azurina eupalama was included on the 2012 IUCN 100 most endangered species list.

IUCN Media Statement Sept 11, 2012.The 100 most threatened species. Are they priceless or worthless?

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Dana Campbell
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Diagnostic Description

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Color olive-gray with a light-blue tint, silver on the ventral side; snout dusky, a black spot at pectoral fin base; pale gray pelvic and anal fins, dusky dorsal fin. Body more slender compared to other Galápagos damselfish. Preorbital bone smooth without a notchlike projection; edge of preopercle irregular, weakly serrate. Lateral line complete and conspicuous (Ref. 28023).
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Recorder
Rodolfo B. Reyes
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Life Cycle

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Oviparous, distinct pairing during breeding (Ref. 205). Eggs are demersal and adhere to the substrate (Ref. 205). Males guard and aerate the eggs (Ref. 205).
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Susan M. Luna
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Morphology

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Dorsal spines (total): 13; Dorsal soft rays (total): 10 - 11; Analspines: 2; Analsoft rays: 11 - 12
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Rodolfo B. Reyes
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Trophic Strategy

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Apparently this species prefers open water near drop-offs, although individuals are found in a variety of inshore habitats to depths of 30 meters. It is not a common species and resident aggregations have strong preferences for specific sites. Feeds mainly on plankton in the water column, usually in heterotypic aggregations with Chromis atrilobata (Ref.28023)..
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Pascualita Sa-a
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Biology

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Apparently this species prefers open water near drop-offs, although individuals are found in a variety of inshore habitats to depths of 30 meters. It is not a common species and resident aggregations have strong preferences for specific sites. Feeds mainly on plankton in the water column, usually in heterotypic aggregations with Chromis atrilobata. Oviparous, distinct pairing during breeding (Ref. 205). Eggs are demersal and adhere to the substrate (Ref. 205). Males guard and aerate the eggs (Ref. 205). Prior to the 1982-83 El Niño, a small aggregation frequented the shallow water just west of Pinnacle Rock at Bartolomé. But despite intensive observations during the decade after this event, no records of this species were made (Ref. 28023).
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Rodolfo B. Reyes
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Galapagos damsel

provided by wikipedia EN

The Galápagos damsel (Azurina eupalama), also known as the blackspot chromis, is a possibly extinct fish species from the family Pomacentridae. It is endemic to the waters near the Galápagos Islands and Cocos Island.

Description

The Galápagos damsel reaches a length of 15 centimeters. It is olive-gray with a blue tinge, and silvery along the sides. There is a black spot at the base of each pectoral fin. It has a prominent lateral line.[2]

Biology and occurrence

The Galápagos damsel has been recorded from following regions in Galápagos: Floreana, Gardiner Bay, Española, Tagus Cove, Isabela, Marchena, James Bay and Sullivan Bay, Santiago, Wreck Bay, San Cristóbal, Academy Bay, Santa Cruz and Santa Fe. One specimen, found many years ago, which is in the fish collection at the American Museum of Natural History, was collected near Cocos Island. The Galápagos damsel is a plankton feeder. It has been suggested that global climate change may have influenced the upwelling ecosystem of the eastern tropical Pacific causing the extinction of this damselfish (Jack Stein Grove / Senior Author of FISHES OF THE GALAPAGOS)

Possible extinction

The El Niño–Southern Oscillation of 1982 and 1983 led to an increase in the water temperature near the Galápagos Islands. Plankton production was reduced for at least one year, leading to drops in the populations of many planktivorous fish, such as the Galápagos damsel. Despite intensive searches during the next decade, it was not seen again. The International Union for Conservation of Nature lists the fish as a critically endangered species, and one which is possibly extinct. It notes, however, that "populations of A. eupalama may still exist on islands off Peru that have warm temperate conditions, such as the Lobos Islands.[1]

References

  1. ^ a b Allen, G.; Robertson, R.; Rivera, R.; et al. (2010). "Azurina eupalama". The IUCN Red List of Threatened Species. 2010: e.T184017A8219600. doi:10.2305/IUCN.UK.2010-3.RLTS.T184017A8219600.en.
  2. ^ Froese, R. and D. Pauly, Eds. Azurina eupalama. FishBase. 2013.
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Galapagos damsel: Brief Summary

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The Galápagos damsel (Azurina eupalama), also known as the blackspot chromis, is a possibly extinct fish species from the family Pomacentridae. It is endemic to the waters near the Galápagos Islands and Cocos Island.

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