Effects of water temperature and post-feeding period on postprandial ammonia excretion and oxygen consumption by larval Pacific cod (Gadus macrocephalus) fed rotifers (Brachionus plicatilis)
Postprandial ammonia excretion and oxygen consumption of 15-d post-hatch larval Pacific cod (Gadus macrocephalus), rotifer-fed (Brachionus plicatilis) since their first feeding, were studied in stationary cultures at 10$^0C$, 13$^0C$, and 16$^0C$ for 48 h. Postprandial ammonia excretion and oxygen consumption rates were determined after 2, 4, 6, 8, 10, 12, 18, 24, 36 and 48 hours. The 48-h post-feeding weight-specific ammonia excretion and oxygen consumption rates increased until 4 h postfeeding, decreased to 18 h post-feeding, and remained relatively stable until 48 h post-feeding. The highest weight-specific ammonia excretion and oxygen consumption rates were 215±19.8 μg NH3-N $g^{-1}$ $h^{-1}$ and 1,778±55.6 μg O2 g–1 $h^{-1}$ 2–4 h postfeeding at 13 $^0C$. The higher (P<0.05) resting ammonia and oxygen consumption at 16 $^0C$ 12-h post-feeding indicate that this temperature is not appropriate for inducing higher growth of rotifer-fed pacific cod larvae.
Anahtar Kelimeler:
larva, Rotifera, amonyum azot, oksijen tüketimi
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- ISSN: 1303-2712
- Başlangıç: 2015
- Yayıncı: Su Ürünleri Merkez Araştırma Enstitüsü - Trabzon
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