No abstract

A raştırmada, doğal zeolit klinoptilolitin akvaryum su koşulları üzerine yaptığı etkilerin belirlenmesi planlanmıştır. Bu amaç ile 2 farklı uygulama yapılarak deneme grupları oluşturulmuştur. İlk uygulama için tül torba olmaksızın 7 gram zeolit (Z7), ikinci uygulama için ise tül torba içerisinde 7 gram zeolit (TZ7) akvaryumlara yerleştirilmiştir. Üçüncü grup ise zeolit konulmayarak kontrol grubu olarak düzenlenmiştir (K). Her üç grubun akvaryumlarına eşit miktarda balık yemi eklenmiş ve 12 gün süresince su koşulları (sıcaklık, pH, NH 3 , TAN) ile ilgili veriler toplanmıştır. Deneme sonunda, süreyle orantılı olarak artan amonyak miktarının; zeolitli gruplarda kontrol grubuna kıyasla 4. günden sonra daha düşük miktarlarda olduğu belirlenmiştir. Deneme gruplarında belirlenen ortalama su sıcaklık değerleri arasında istatistiki bir fark belirlenmezken (P>0.05), pH ve amonyak değerleri arasındaki farkın istatistiki olarak önemli olduğu belirlenmiştir (P<0.05).

No abstract

The aim of this study was to investigate the effect of different carotenoid sources on goldfish (Carassius auratus) skin pigmentation. The value of goldfish depends on the intensity of the skin color. In the red variety of goldfish, an orange-red hue is desirable. Juvenile goldfish were fed one of five diets for five months to determine the effects of carotenoids on skin pigmentation, growth, feed efficiency, and survival: (1) astaxanthin (carophyll pink at 75 mg/kg), (2) canthaxanthin (carophyll red at 75 mg/kg), (3) Gammarus spp. (75 mg/kg), (4) Oleoresin paprika (180 mg/kg), and (5) an unsupplemented control. Growth and feed efficiency did not significantly differ among groups. Initial and final samples of head skin were measured by colorimetric analysis for lightness (L*), redness (a*), yellowness (b*), hue (Hº ab), and chroma (C ab *). The best red color (a* and Hº ab) was obtained with the astaxanthin, canthaxanthin, and paprika diets.

This research was designed in order to examinate the effects of 17α-methyltestosterone and 17β-estradiol hormone use on the development, growth performance, survival, sex ratio and coloration of the electric yellow cichlid (Labidochromis caeruleus Fryer, 1956). Seven different groups were designed in the study. While no hormones were added to the control diet, 6 different rates of hormones were added to the other groups. Cichlid mean weight was determined as 0.64±0.01 g, were stored such that three replications for each group. The fish were fed with the feeds for a period of 2 months. At the end of this research, the highest weight gain was determined in the 20 mg kg -1 17α-MT group (0.39±0.17 g). When the sex change rates were evaluated, it was determined that the feminization rates in the 17β-ES hormone group were 80.00%, 82.22% and 86.67%, respectively, and all fishes in the 17α-MT hormone group were 100% male. When the results of the physical color analysis were evaluated, it was determined that the best coloration was obtained in the 17α-MT groups. At the end of the study, the 17α-MT hormone was determined to have a better effect than 17β-ES hormone on the growth, feed conversation rate, sex change and pigmentation of electric yellow cichlid (Labidochromis caeruleus Fryer, 1956).