Growth of Over-wintered and Pre-seasonally Produced Post-larvae of Penaeus semisulcatus in the Subtropics
Öz
Growth performance of Penaeus semisulcatus under semi-intensive and intensive systems in pond/tank culture conditions with pre-seasonally or over-wintered animals was studied in sub-tropical climate conditions of Turkey. In Pond A, the pre-seasonally produced post-larvae (PL) grew linearly from 0.2 g to 22.6 g in 140 days (Y = 0.19 X- 2.69; R2 = 0.97) with DGR (daily growth rate) of 0.06 g day-1. In Pond B, the over-wintered juveniles grew from 3.8 g to 30.5 g with DGR of 0.41 g during the first 30 days (weight gain of 14.42 g) and 0.13 g between 30 and 140 days (weight gain of 14.32 g). Regression equation for growth was calculated to be Y = 9.62 Log (X) + 4.51 (R2 = 0.99). Compensatory growth due to starvation or over-winter fasting has, for the first time, been demonstrated in this penaeid shrimp species in the present study. Food deprivation during the winter months resulted in growth compensation after refeeding under appropriate culture conditions. During the compensatory growth period (first month after re-feeding), the shrimps gained an average weight of 2.87 g week-1, but after this period, growth rate declined to 0.91 g week-1 (over three-fold less) for the rest of the growth period (between 2nd and 5th months). This preliminary finding is a promising area on which studies should be focused on, as fasting and re-feeding strategy at low temperature can provide a chance to increase marketable size of shrimps or to even produce two crops per year in the sub-tropics. The shrimps (0.2 g) reached to 13.7 g at 30 PL per m2 (DGR 0.10 g), 6.44-7.37 g (DGR 0.05 g) at 40-50 PL per m2 in 140 days. The estimated yields were 880-1,150 kg ha-1 in semi-intensive ponds and 1,597-2,673 kg ha-1 in intensive ponds. The shrimps grown in concrete Tanks displayed even poorer growth performance resulting in only 879 kg and 793 kg ha-1 of yield.
Anahtar Kelimeler
Penaeus semisulcatus grow-out over-wintering growth feed conversion rate
Growth of Over-wintered and Pre-seasonally Produced Post-larvae of Penaeus semisulcatus in the Subtropics
Öz
Growth performance of Penaeus semisulcatus under semi-intensive and intensive systems in pond/tank culture conditions with pre-seasonally or over-wintered animals was studied in sub-tropical climate conditions of Turkey. In Pond A, the pre-seasonally produced post-larvae (PL) grew linearly from 0.2 g to 22.6 g in 140 days (Y = 0.19 X- 2.69; R2 = 0.97) with DGR (daily growth rate) of 0.06 g day-1. In Pond B, the over-wintered juveniles grew from 3.8 g to 30.5 g with DGR of 0.41 g during the first 30 days (weight gain of 14.42 g) and 0.13 g between 30 and 140 days (weight gain of 14.32 g). Regression equation for growth was calculated to be Y = 9.62 Log (X) + 4.51 (R2 = 0.99). Compensatory growth due to starvation or over-winter fasting has, for the first time, been demonstrated in this penaeid shrimp species in the present study. Food deprivation during the winter months resulted in growth compensation after refeeding under appropriate culture conditions. During the compensatory growth period (first month after re-feeding), the shrimps gained an average weight of 2.87 g week-1, but after this period, growth rate declined to 0.91 g week-1 (over three-fold less) for the rest of the growth period (between 2nd and 5th months). This preliminary finding is a promising area on which studies should be focused on, as fasting and re-feeding strategy at low temperature can provide a chance to increase marketable size of shrimps or to even produce two crops per year in the sub-tropics. The shrimps (0.2 g) reached to 13.7 g at 30 PL per m2 (DGR 0.10 g), 6.44-7.37 g (DGR 0.05 g) at 40-50 PL per m2 in 140 days. The estimated yields were 880-1,150 kg ha-1 in semi-intensive ponds and 1,597-2,673 kg ha-1 in intensive ponds. The shrimps grown in concrete Tanks displayed even poorer growth performance resulting in only 879 kg and 793 kg ha-1 of yield.
Anahtar Kelimeler
Penaeus semisulcatus grow-out over-wintering growth feed conversion rate
Ayrıntılar
| Birincil Dil | Türkçe |
|---|---|
| Bölüm | Makaleler |
| Yazarlar | |
| Yayımlanma Tarihi | 1 Nisan 2010 |
| Yayımlandığı Sayı | Yıl 2010 Cilt: 10 Sayı: 2 |