The Age and Growth Features of Tench (Tinca tinca L., 1758) in Kapulukaya Dam Lake, Central Anatolia, Turkey

In this study age and growth features of tench (Tinca tinca L., 1758) living in Kapulukaya Dam Lake (Ankara, Turkey) were studied between April 2000 and March 2001. Totally, 150 tench were examined. Fish aged I-VII years were present and the population was 55.31% female and 44.69% male. The fork length and weight of females varied from 18.6-36.1 cm and from 85-1060 g, respectively and in males from 16.6-34.4 cm and from 140-1120 g, respectively. Age-length and age-weight relations were calculated according to von Bertalanffy growth equation formula. The following values were obtained for females and males, respectively. L-t = 45.11 [1-e((-0.15607 (t+1.97938))], W-t = 1974.62 [1-e((-0.1617 (t+1.8213))] 3.1752, L-t = 44.61 [1-e((-0.1617 (t+1.8213))],W-t = 1730.58 [1-e((-0.15607) ((t+0.97938))] 2.9571. The length-weight correlation was found to be W = 0.0228 L-2.9571 for males and W = 0.0111 L-3.1752 for females

The growth and reproduction of white bream (Blicca bjoerkna L. 1758) in an oligo-mesotrophic lake in northwest Anatolia (Sapanca, Turkey)

Growth parameters and the reproduction period of white bream (Blicca bjoerkna L. 1758) sampled from Sapanca Lake were determined monthly between November 2000 and October 2001. Three hundred and fifty white bream specimens caught ranged in age from 1(+) to 9(+) years, and the majority of the samples consisted of individuals of the 5(+)-year-old age group. The von Bertalanffy equation was determined as Lt = 22.169 (1 - exp {-0.215[t + 0.986]}), empty set: 2.02 for males and Lt = 31.917 (1 - exp {-0.122[t + 1.087]}), empty set': 2.10 for females. The length-weight relationship was estimated as W = 0.0046 TL exp. 3.315 +/- 0.002 for males (r(2) = 0.9653, P < 0.05), and W = 0.0036 TL exp. 3.417 +/- 0.002 for females (r(2)= 0.9671, P < 0.05). Regression coefficients for sex were significant (t-test, P < 0.05). The slope (b) significantly differed (ANCOVA, P < 0.05) between months. The fact that the b values for male and female white breams differed from 3.0 indicates that there was positive allometric growth. Sex ratio was 1:1.36 (chi(2); P < 0.05). Spawning period of white breams began at the end of April and continued until the beginning of July; water temperature during this period ranged between 13.7 and 28.5 degrees C

THE EVALUATION OF THE GROWTH PERFORMANCE OF A CYANOBACTERIAL ISOLATE PHORMIDIUM LUCIDUM (KÜTZİNG EX GOMONT 1892) GROWN UNDER DIFFERENT ENVIRONMENTAL CONDITIONS AND ITS USE AS A DIETARY SOURCE FOR DAPHNIA MAGNA (STRAUS 1820)

This study presents the effect of cyanobacterium isolated from BollukLake (Konya, Türkiye) which is a saline lake on the growth performance of Daphniamagna. Isolated cyanobacteria species were identified as Phormidium lucidumaccording to its 16S rDNA sequences. The effects of different growth conditionsincluding pH (7.18, 8.15, 9.17 and 10.26), light intensity (1200, 2400, 3600 and 4800lux), temperature (10, 20, 25 and 30°C) and nitrogen concentrations (0.25, 0.5, 1.0 and1.5 g/L) on P. lucidum was studied. Effects of each environmental factor onbiochemical composition (total protein, total lipid and chlorophyll-a concentration) ofP. lucidum were also studied. The optimum growth conditions were found as pH 7.18,ambient temperature 20°C, nitrogen 0.25 g/L and light intensity 3600 lux, after a 2-week incubation period. The effects of various mixtures of the cyanobacteria andChlorella vulgaris which is a common feed for Daphniids were also evaluated for theireffects on the growth rates of D. magna. The best growth rate for D. magna wasobtained in the medium containing 100% P. lucidum at the end of the 13ᵗ ͪ day

Seasonal Composition and Population Density of Zooplankton in Lake Karabogaz from the Kizilirmak Delta (Samsun, Turkey)

Zooplankton composition and abundance were investigated seasonally at 6 sites in Lake Karabogaz in relation to some physicochemical conditions. A total of 63 taxa were identified, among them 51 species of rotifers, 8 cladocerans, and 4 copepods. Rotifera represented the predominant component (79% of the total community), followed by nauplii, cladocerans, and copepods (15%, 5%, and 1%, respectively). The average total zooplankton abundance ranged from 9603 to 22,968 ind/m(3). The maximum and the minimum densities were measured in June and August of 2009, respectively. Of the identified zooplankton, 39 taxa were species with a low frequency in the lake. Among the species with the highest frequency of encounter were Coronatella rectangula, Chydorus sphaericus, Colurella adriatica, Keratella quadrata, Lecane closterocerca, L. bulla, and Polyarthra vulgaris. Zooplankton diversity showed a positive correlation with temperature and chlorophyll a. However, a significant negative correlation was detected between diversity and salinity.WoSScopu

A checklist of Turkish rotifers

Kaya, Murat (Aksaray, Yazar)In a book chapter containing the fi rst checklist and distribution of Turkish rotifers, published in 1999, were listed 167 taxa. The second checklist, published in 2004, reported 229 rotifer taxa in Turkey. During the 7 years since this checklist process, many studies have been carried out and we have prepared a new checklist of Turkish rotifers in the present study. In all, 341 rotifer taxa have been recorded to date