分類 / Names
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Cichliformes (Cichlids, convict blennies) >
Cichlidae (Cichlids) > Geophaginae
Etymology: Gymnogeophagus: Greek, gymnos = naked + Greek, gea = the earth + Greek, phaegein, to eat (Ref. 45335); caaguazuensis: Named for the province of Caaguazú, Paraguay, the area of occurrence of the new species; an adjective, masculine form..
Environment: milieu / climate zone / depth range / distribution range
生態学
; 新鮮な水 底生の漂泳性. Tropical
South America: Paraguay.
サイズ / 重さ / 年齢
Maturity: Lm ? range ? - ? cm
Max length : 8.6 cm SL オス/雌雄の選別がない; (Ref. 78439)
簡単な記述
形態学 | 形態計測学
This small mouthbrooding species possess the following characters: a conspicuous secondary sexual dimorphism; differs from its congeners in having a body that is comparatively deep, short caudal peduncle, lyreate caudal fin of males, scales in E1 row 26-28, and its small size, maximum length 8.63 cm SL (Ref. 78439).
Prefers habitats that are bare sandy bottoms among rocky areas in small rivulets which may have a strong current during the rainy season. During the dry season and period of low water, this species is found in pools and ponds with more or less stagnant water. In February, water data collected at the type locality has pH 7.9; electrical conductivity 240 μS/cm; temperature 24.2 °C. Associated fish fauna included Phalloceros caudimaculatus (Poeciliidae), Rineloricaria sp. (Loricariidae) and two small characid species. This species displays a variety of parental care and mating systems ranging from mouthbrooding and polygyny to substrate spawning and monogamy. In the aquarium, breeding was observed and the species was azuensis found to be a delayed (larvophile) maternal mouthbrooder, where like several of its congeners, it starts reproduction like a substrate spawner, i. e. the parents initially spawn on a stone, but just prior to the hatching of the larvae the female picks up the eggs and then orally broods the larvae and young. Courting males, in from of ripe females, display a conspicuous quivering movement of their mouths caused by opening and closing the mouth with extremely high frequency and this peculiar behaviour during courtship seems to be a synapomorphy of the mouthbrooding species, as it has been observed only within this species complex (Ref. 78439).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Staeck, W., 2006. Gymnogeophagus caaguazuensis sp. n. - a new species of cichlid fish (Teleostei: Perciformes: Cichlidae) from the drainage of the lower río Paraguay in Paraguay. Zoologische Abhandlungen (Dresden) 56:99-105. (Ref. 78439)
IUCNのレッドリストの状況は (Ref. 130435)
絶滅危惧 (EN) (B1ab(iii)+2ab(iii)); Date assessed: 16 December 2020
Human uses
より多くの情報
共通名の類義語代謝捕食動物生態毒性繁殖成熟放精卵の集合体生産力卵卵の開発
Age/Size成長体長-重さLength-length体長組成形態計測学形態学幼生幼生の動力補充豊度BRUVS
参考文献水産養殖水産養殖の紹介緊張遺伝子のElectrophoreses遺伝病気行列NutrientsMass conversion
協力者画像Stamps, Coins Misc.音シガテラ（食中毒の名前）速度泳ぐ 型式カマOtoliths脳視覚
用具
特記事項
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インターネットの情報源
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5005 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02188 (0.01030 - 0.04649), b=3.03 (2.84 - 3.22), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
栄養段階 (Ref.
69278): 3.3 ±0.5 se; based on size and trophs of closest relatives
回復力 (Ref.
120179): 高い, １５か月以下の倍増期間の最小個体群 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
