Neon Tetra ή Cardinal Tetra

[delta66]

Το ιδιο ειναι.
Οτι σου αρεσει περισσοτερο.

Εδω καποιες πληροφοριες για τα ειδη.
Αφορουν wild ψαρια ομως, κι οχι εκτροφης.

Αρχική Δημοσίευση από delta66

Ιδανικες συνθηκες για:

Neon Tetras
pH: 5-6
GH: 0-1
T: 24-29C

Cardinal Tetras
pH: 3.8 - 4.8
GH: 0
T: 23.5 - 28.5C

Πηγη: The history of the neon and cardinal tetras by Heiko Bleher
http://www.hagen.com/pdf/aquatic/Nutrafin_Aquatic_Ne.ws_USA.pdf

σελ
....The species (neon tetras) is found primarily in Peru, in the so-called quebradas, small clearwater streams with a significant blackwater component, where the pH varies between 5.0 and 6.0 and the temperature between 75 and 84°F, and the total hardness is less than 1.0°dGH...

σελ 5
...When such sensitive fishes (cardinal tetras), originating from extreme water conditions where the pH fluctuates between 3.8 and 4.8 and the temperature between 74.5 and 83.5 °F, and where the total hardness is so small as to be virtually unmeasurable..

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Οσμωτικη λειτουργια του Neon tetras
Ionoregulatory specializations for exceptional tolerance of ion-poor, acidic waters in the neon tetra (Paracheirodon innesi).
Gonzalez RJ, Preest MR.

Department of Biology, University of San Diego, 5998 Alcalα Park, San Diego, California 92110. gonzalez@acusd.edu
Abstract

To better understand how fish are able to inhabit dilute waters of low pH, we examined ionoregulation in exceptionally acid-tolerant neon tetras (Paracheirodon innesi), which are native to the ion-poor, acidic Rio Negro, Amazon. Overall ion balance was unaffected by 2-wk exposure to pH 4.0 and 3.5.
Measurements of unidirectional Na+ fluxes during exposure to pH 3.5 showed that tetras experienced only a mild, ionic disturbance of short duration (</=24 h) as a result of a stimulation of Na+ efflux.
At pH 3.25, Na+ efflux was almost fourfold greater (all fish died within 6-8 h). At both pHs, active Na+ uptake was not inhibited, and in fact, at pH 3.5, uptake was stimulated. Kinetic analysis of Na+ uptake at pH 6.5 and 3.5 produced virtually identical low Km values and high maximum-transport values.
These results confirmed the pH insensitivity of the uptake mechanism and revealed a mechanism well designed to operate in the dilute, acidic waters of the Rio Negro. Na+ influx was only mildly sensitive to amiloride (a Na+ channel blocker), which, along with the pH insensitivity, suggests that Na+ uptake may occur by a novel mechanism. Na+ efflux was reduced by addition of Ca2+ to the test water at pH 6.5, but the effect disappeared at pH 3.5.
Exposure to LaCl3 (a strong Ca2+ displacer) also stimulated Na+ efflux. These results suggest that Ca2+ plays a role in determining branchial ion permeability at high pH but that, at low pH, where Na+ efflux is stimulated, alternate, Ca2+-independent mechanisms are employed to control Na+ efflux.

Για τα cardinal εχω να παραθεσω κι αυτα τα επιστημονικα αρθρα κατευθειαν απο τη Βραζιλια

Acta Amazonica - The food spectrum of the cardinal - tetra (Paracheirodon axelrodi, Characidae) in its natural habitat

Acta Amazonica - Tolerance to temperature, pH, ammonia and nitrite in cardinal tetra, Paracheirodon axelrodi, an amazonian ornamental fish

[ioannis_79]

Οπως πάντα....τεκμηριωμένες απόψεις delta66
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Αρχική Δημοσίευση από kostas_pana

Καλησπέρα και απο μενα. Κ εγω χωρις να ειμαι σίγουρος το κοπαδιασμα θεωρω την μονη τους διαφορα. Τα καρντιναλ κοπαδιαζουν πολυ καλύτερα.
Ελπιζω να βοήθησα λιγακι...

Σε ευχαριστώ πολύ....

[delta66]

Αν ειναι ολα καλα στο ενυδρειο και αισθανονται καλα, σπανια κοπαδιαζουν και το ενα και το αλλο ειδος.
Σκορποχωρι.

Δεν κοπαδιαζουν χωρις λογο.
Και οι λογοι ειναι λιγοι.
Αμυνα στο στρες (πολυ ή λιγο και για διαφορους λογους, απο συνθηκες νερου, μεχρι φωτισμο, μεχρι συγκατοικοι, μεχρι μεχρι κινηση εξω απο το ενυδρειο κλπ)
και μεταναστευση/μετακινηση (υποτυπωδης στο ενυδρειο).

Αν εγινε καποια διαφορετικη παρατηρηση σε ενα απο τα δυο ειδη, θα εγινε για καποιον απο τους παραπανω λογους.