Impact of higher stocking density of juvenile Atlantic sturgeon, Acipenser oxyrinchus Mitchill, on fish growth, oxygen consumption, and ammonia excretion

Impact of higher stocking density of juvenile Atlantic sturgeon, Acipenser oxyrinchus Mitchill, on fish growth, oxygen consumption, and ammonia excretion The impact of stocking density on the growth, feed conversion, oxygen consumption, and ammonia excretion of juvenile Atlantic sturgeon (Acipenser oxyrinchus Mitchill) was studied. Three initial stocking densities were used in the experiment: 1.27, 2.49, and 3.80 kg m-2. The length of the experiment was 64 days. The mean water temperature was 15.0°C. The fish were fed commercial feed Nutra T 1.9 (Trouv, France). Atlantic sturgeon body weight growth was the highest in the group stocked at the lowest density. The fish from this group attained a final body weight of 130.1 g, which was statistically significantly higher than that of the groups stocked at densities of 2.49 kg m-2 (P < 0.05) or 3.80 kg m-2 (P > 0.01). Stocking density had a substantial impact on the value of the feed conversion ratio (FCR) in the different groups. The lowest FCR was noted at the density of 1.27 kg m-2 at 0.67. This value differed statistically significantly from group 2.49 kg m-2, in which it was 0.74 (P < 0.05), and it differed highly statistically significantly from group 3.80 kg m-2 at 0.83 (P < 0.001). The differences in the FCR value between groups 2.49 and 3.80 kg m-2 were also highly statistically significant. Stocking density was not noted to impact oxygen consumption or ammonia excretion. Mean daily ammonia excretion fluctuated from 2.09 to 2.39 mg kg-1 h-1, and oxygen consumption ranged from 90.5 to 93.8 mg O2 kg-1 h-1. Wpływ zagęszczenia obsady juwenalnego jesiotra ostronosego, Acipenser oxyrinchus Mitchill na wzrost ryb, konsumpcję tlenu i wydalanie amoniaku Celem przeprowadzonych badań było określenie wpływu różnych zagęszczeń obsady juwenalnego jesiotra ostronosego na wyniki chowu oraz konsumpcję tlenu i wydalanie amoniaku. Materiałem do badań były juwenalne jesiotry ostronose (średnia masa ciała 65,3 g, długości ciała SL 21,1 cm i długości całkowitej TL 26,3 cm). Zastosowano trzy początkowe zagęszczenia obsady: 1,27 kg m-2 (grupa L), 2,49 kg m-2 (grupa M) i 3,80 kg m-2 (grupa H). W 63 dniu eksperymentu (wiek ryb 231 dni po wykluciu) przeprowadzono pomiary konsumpcji tlenu i wydalania amoniaku narybku oraz natężenia oświetlenia. Wzrost masy ciała był najszybszy w grupie z najniższym zagęszczeniem obsady. Na koniec eksperymentu ryby w tej grupie osiągnęły masę ciała 130,1 g i była ona istotnie statystycznie wyższa niż w grupachMi H. Stwierdzono istotne statystycznie różnice wartości dobowych przyrostów masy ciała (SGR) w całym okresie chowu pomiędzy grupami L i H. Zagęszczenie obsady wpłynęło w dużym stopniu na wartość współczynników pokarmowych (FCR) w poszczególnych grupach. Wartość FCR uzyskano w grupie L wynosiła 0,67 i różniła się istotnie statystycznie od grupy M i H (odpowiednio: 0,74 i 0,83). Nie stwierdzono wpływu zagęszczenia obsady na wielkość konsumpcji tlenu i wydalania amoniaku. Średnia dobowa wielkość wydalania amoniaku wahała się od 2,09 do 2,39 mg kg-1 h-1, a wielkość konsumpcji tlenu od 90,5 do 93,8 mg O2 kg-1 h-1. Uzyskane wyniki wskazują, że zwiększenie zagęszczenia obsady powyżej 3,80 kg m-2 ogranicza wzrost i znacznie obniża efektywność wykorzystania paszy u juwenalnego jesiotra ostronosego, nie ma natomiast wpływu na wielkość zapotrzebowania tlenowego i wydalania amoniaku oraz zmiany tych wskaźników w cyklu dobowym.

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