Oxygen consumption and ammonia excretion by Eurasian perch (Perca fluviatilis L.) reared under optimal thermal conditions

• Autorzy: Zakes Z. , Demska-Zakes K.

Warianty tytułu

PL

Konsumpcja tlenu i wydalanie amoniaku przez okonia (Perca fluviatilis L.) podchowywanego w optymalnych warunkach termicznych

• Języki publikacji: EN

Abstrakty

EN

The aim of the study was to determine the oxygen consumption (OC, mg O₂ kg⁻¹h⁻¹) and ammonia production (AE, mg TAN kg⁻¹h⁻¹) of perch reared in a recirculating system at the optimal temperature for this species of 23°C. The studies were conducted when the fish were undergoing intense fattening on artificial feed. Measurements of metabolic rate were taken 24 hours per day in six size groups of fish (mean body weights (BW) in each group - 18.4, 30.7, 46.4, 56.5, 67.8, 82.3 g). Within the studied perch size range, OC decreased from 336.2 to 185.0 mg O₂ kg⁻¹h⁻¹, and AE from 22.0 to 5.6 mg TAN kg⁻¹h⁻¹. An increase in body weight by 1 g led to an average decrease in oxygen consumption by a mean of 2.53 mg O₂ kg⁻¹h⁻¹ and ammonia excretion by 0.28 mg TAN kg⁻¹ h⁻¹. During the analyzed period, the body weight of perch, the arithmetic dependence between OC-BW and AE-BW, was linear and the determination coefficients R² of the linear regression equations describing these relationships were highly statistically significant at a value exceeding 0.9.

PL

Celem pracy było określenie konsumpcji tlenu (OC, mg O₂ kg⁻¹h⁻¹) i produkcji amoniaku (AE, mg TAN kg⁻¹h⁻¹) przez okonia podchowywanego w obiegu recyrkulacyjnym, w optymalnej temperaturze wzrostu tego gatunku, tj. 23°C. Badania prowadzono w trakcie intensywnego tuczu okonia na paszy sztucznej. Całodobowe pomiary tempa metabolizmu przeprowadzono dla sześciu grup wielkości ryb (średnia masa ciała (BW) w poszczególnych grupach wynosiła: 18,4, 30,7, 46,4, 56,5, 67,8, 82,3 g; tab. 1). W badanym przedziale wielkości okonia OC obniżyła się od 336,2 do 185,0 mg O₂ kg⁻¹h⁻¹, a AE od 22,0 do 5,6 mg TAN kg⁻¹h⁻¹. Przyrost masy ciała o 1 g przyczyniał się do obniżenia konsumpcji tlenu średnio o 2,53 mg O₂ kg⁻¹h⁻¹, a wydalania amoniaku o 0,28 mg TAN kg⁻¹ h⁻¹ (tab. 2). W analizowanym zakresie masy ciała okonia, arytmetyczne zależności OC-BW oraz AE-BW miały charakter liniowy, a współczynniki determinacji R² równań regresji liniowych opisujących te związki, były wysoce istotne statystycznie i przyjęły wartość powyżej 0,9 (rys. 1).

Słowa kluczowe

EN

oxygen consumption; ammonia excretion; fish; Eurasian perch; Perca fluviatilis; optimal condition; thermal condition; recirculating system

• Wydawca: -
• Czasopismo: Archives of Polish Fisheries
• Rocznik: 2005
• Tom: 13
• Numer: 2
• Opis fizyczny: p.251-258,fig.,ref.

Twórcy

autor

Zakes Z.

• Department of Aquaculture, The Stanisław Sakowicz Inland Fisheries Institute in Olsztyn, Oczapowskiego 10, 10-719 Olsztyn, Poland

autor

Demska-Zakes K.

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