Farklı oranlarda yumurta tozu içeren yem rasyonlarının yavru gökkuşağı alabalığının (Oncorhynchus mykiss walbaum, 1792) büyüme performansı, yem kullanımı, vücut kompozisyonu ve yaşam oranına etkileri

This study aims to determine the appropriate egg powder ratio that can be substituted into the fish meal to close the protein deficit without adversely affecting the development performance of rainbow trout fry (Oncorhynchus mykiss) (0.38 +/- 0.01 g and 3.55 +/- 0.05 cm). Also, the effects of egg powder used as a protein source on rainbow trout feed on growth performance, feed utilization, body composition, and survival rates were investigated. The egg powder ratio in the ration of the groups were arranged to be 0% (Control), 25% (E-25), 50% (E-50), 75% (E-75), and 100% (E-100) of the amount of protein obtained from fish meal. To evaluate their growth performance, fish were fed for 90 days between March and May, and additional feeding was given for 17 days for the challenge test. As a result of the study, when the more than 25% egg powder was added to the ration, the final body weight (FBW), weight gain (WG), weight gain rate (WGR), specific growth rate (SGR), feed intake (FI), and protein efficiency ratio (PER) had a statistically significant difference among the groups (p<0.05). It was determined that the difference between groups was insignificant in terms of condition factor (CF), and the addition of more than 25% egg powder to the ration increased the feed conversion ratio (FCR) statistically and significantly (p<0.05). As a result of the challenge test carried out with two different fish pathogens (Lactococcus garvieae and Yersinia ruckeri), it was determined that the addition of egg powder decreased the survival rate in all groups compared to the control group (p<0.05). As a result, it was concluded that up to 25% of egg powder can be used rainbow trout fry feeds, but continuous feeding with egg powder supplemented feeds may cause fish health problems

Gökkuşağı alabalığı (Oncorhynchus mykiss)’nın spermatolojik özellikleri ve spermanın kısa süreli muhafazası

Bu çalışma gökkuşağı alabalığının spermatolojik özelliklerini belirlemek ve spermanın kısa süreli muhafazası için sulandırıcı geliştirmek amacıyla yapılmıştır. Üreme sezonunda, 12 erkek bireyden sperma abdominal masaj yöntemi ile alınmıştır. Alınan spermalarda, miktar, motilite, motilite süresi, spermatokrit oranı, yoğunluk ve pH belirlenmiştir. Bunların dışında, canlı ağırlık ile total boy ölçülmüş ve bu parametreler ile spermatolojik özellikler arasındaki korelasyonlar araştırılmıştır. Gökkuşağı alabalığı spermalarında; miktar (mL), motilite (%), motilite süresi (s), spermatokrit oranı (%), yoğunluk (x 109 spz/mL) ve pH değerleri sırasıyla ortalama 16,2 ± 14,45, 97,5± 4,52, 114,5 ± 31,64, 22,1 ± 10,15, 9,4 ± 4,48 ve 7,1 ± 0,16 bulunmuştur. Sperma miktarı ile motilite arasında önemli (P < 0,01) negatif korelasyon, sperma miktarı ile spermatozoa yoğunluğu arasında (P < 0,05) ise pozitif bir korelasyon saptanmıştır. Glikoz içeren sulandırıcı S-1’de muhafaza edilen spermanın daha yüksek bir motiliteye sahip olduğu ve sulandırıcı S-1’in diğerinden daha etkin olduğu görülmüştür.Spermatologic Characteristics and Short-term Storage of Rainbow Trout, Oncorhynchus mykiss, Sperm This study was carried out to determine the spermatologic characteristics and to develop an extender for the short-term storage of semen from rainbow trout. In the spawning season, sperm was collected by abdominal massage from 12 males. In collected sperm; volume, motility, duration of motility, spermatocrit, density and pH were determined. Furthermore, body weight and total length were measured and correlations between spermatologic characteristics and these parameters were investigated. In the sperm of rainbow trout, volume (mL), motility (%), duration of motility (sec), spermatocrit, density (x 109 /mL), and pH values were found as mean 16.2 ± 14.45, 97.5± 4.52, 114.5 ± 31.64, 22.1 ± 10.15, 9.4 ± 4.48 and 7.1 ± 0.16, respectively. Sperm volume were negatively correlated with motility (P < 0.01), but positively correlated with sperm density (P < 0.05). Sperm stored in extender S-1 (containing glucose) had a higher rate of motility and the extender S-1 seemed to be more effective than the other

Histopathology of rainbow trout (oncorhynchus mykiss) and sturgeon (acipenser baerii) exposed to sublethal concentrations of cement

KURTOGLU, ILKER ZEKI/0000-0002-4214-7997WOS: 000384966000026In the present study, histopathologic effects of the cement mixing with water in aquatic environment on rainbow trout (Oncorhynchus mykiss) and Siberian sturgeon (Acipenser baerii) has been examined. Both of the two fish species were exposed to 125 and 500 mg/l of concentrated cement for 96 hours. LC50 values were calculated 0.44 g/l for trout (O. mykiss) and 0.62 g/l for Siberian sturgeon (A. baerii) at the end of the experiment for 96-hour test period. No mortality was observed in control groups. Multiple deformations became remarkable in the gills of both species. However, some hyperplasia was observed on secondary lamellae of gills of both fish species. Hyperplasia rates were found to be much higher in the sturgeon individuals than the trout individuals. Also, lamellar fusion was another important pathology in the gills of the sturgeon individuals. Few necroses have been encountered on the lamellas of the trout gills. Multiple fat granules were observed in the trout liver tissue, melanomacrophage centers and necrosis on sturgeon liver tissue treated with 500 mg/l cement. As a result, this study expressly shows that both of the two species, Siberian sturgeon and rainbow trout, cannot tolerate cement-sourced contamination.RTEU BAPRecep Tayyip Erdogan University; Fisheries Research & Application Center DirectorateWe offer our gratitude to RTEU BAP Coordinatorship and Fisheries Research & Application Center Directorate, because of study finance and live material supply

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