The Effects of Different Sized Granules and Particle Composition on Growth of Rainbow Trout (Oncorhynchus mykiss)

Three feeding regimes were tested to determine their effects on growth, survival, and feed conversion in rainbow trout alevins for 60 days. In the first regime, the alevins were fed a starter feed consisting of 800 micron parti- cles for the first 15-day period. For the following 15-day period, the alevins were given a starter feed consisting of 1200 micron particles. For the final two 15-day periods, the alevins were given feeds consisting of 1500 micron and 2 mm particles, respectively. In the second regime, feed particles in the four periods were 1200 micron, 1500 micron, 2 mm, and 3 mm granules, respectively. In the third regime, feeds contained 1500 micron, 2 mm, 3 mm, and 4 mm granules. During the first two 15-day periods, no significant dif- ferences in growth parameters were detected (p>0.05). In the second two 15-day periods, there were significant differences in final live weight, growth, and feed conversion rates between groups (p0.05)

Alterations In The Hematological Parameters Of Rainbow Trout, Oncorhynchus Mykiss, Exposed To Cypermethrin

Rainbow trout were exposed to sublethal concentrations of the pesticide cypermethrin (1/8, 1/4 and 1/2 of the LC50, 0.0082 mg/l) for 21 days at 24-hour intervals. At the end of the exposure period, hematological parameters were investigated. As the concentration of cypermethrin increased, there were increases in red blood cells, hemoglobin concentration, mean corpuscu- lar hemoglobin, mean corpuscular hemoglobin concentration, thrombocyte count and erythro- cyte sedimentation rate. As the exposure increased, there were decreases in packed cell vol- ume, mean corpuscular volume and white blood cell count. Differences among treatments were significant (p<0.05) only for red blood cells, mean corpuscular volume, thrombocyte count and erythrocyte sedimentation rate when exposure rose from 1/8 to 1/2 of the LC50 concentration

Karasu Irmağında Yaşayan Capoeta umbla (Heckel, 1843)’ nın Et Verimi ile Çeşitli Vücut Organları Arasındaki İlişkiler

Bu çalışmada, Karasu Irmağı'nda yaşayan Capoeta capoeta ubla türünün et verimi ile çaşitli vücut organları arasındaki ilişkiler incelenmiştir. Yapılan incelem sonucunda, ortalama baş ağırlığı/vücut ağırlığı oranı %22,32; iç organların ağırlığı/vücut ağırlığı % 17,78; yüzgeç ağırlığı/vücut ağırlığı & 1,48; pul ağırlığı/vücut ağırlığı % 1,49; kılçık ağırlığı/vücut ağırlığı %14,82; kılçıksız et ağırlığı/vücut ağırlığı %44,29; kesim randımanı % 61,44 olarak saptanmıştır