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    Aspects of the biology of Liza abu (Mugilidae) in the Tigris River (Turkey)
    (Soc Francaise D Ichtyologie, 2000) Ünlü, E; Balci, K; Meric, N
    Sex distribution, growth in length and weight, relative condition index, attainment of first maturity age, and fecundity of Liza abu were examined in the Tigris River, South-eastern Anatolia. This species migrates towards upstream the Tigris River at a period extending from August to late February. The age of 480 specimens (263 females and 217 males) ranged between 1+ and 4+. The observed sex ratio was 1.21 female: 1 male in the studied samples. Allometric growth patterns was proved from the length-weight relationships. The female had high L infinity (204.27 mm), but low K (0.304531) value whereas the Lm (195.77 mm) for male were lower, but the K (0.383129) value was higher. It was seen that relative condition index values from August and September were higher than those recorded at other times of the year. Spawning do not occur at this time in this area. According to development of gonad, male and female become sexually mature at the first year of their life-span. The smallest mature female was 117 mm in fork length and 17 g in total weight, while male was 115 mm in fork length and 14 g in total weight. The number of oocytes ranged from 12,175 to 56,400. Fecundity was significantly correlated with fish length, fish weight and gonad weight.
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    The histopathological effects of Thiodan® on the liver and gut of mosquitofish, Gambusia affinis
    (Marcel Dekker Inc, 2001) Cengiz, EI; Ünlü, E; Balci, K
    Thiodan (R) (33.7% endosulfan), a polychlorinated cyclodiene insecticide, was evaluated for its histopathological effects on mosquitofish, Gambusia affinis, by light microscopy. Fish were exposed to doses of 0.00 (control), 1.00, 2.50, and 5.00 mug/L on days 7, 14, 21, and 30. No histopathological effects were apparent at control group. The histopathological alterations were characterized as oedema, degeneration, accumulation of lymphocytes in the lamina propria, disintegration of villuses, pycnotic state of nuclei, and necrosis in gut; degeneration, hypertrophy, sinusoids enlargement, hemorrhage, pycnosis position of nuclei, vacuolization of cell cytoplasm, infiltration of mononuclear lymphocyte, and congestion in liver. These alterations were time- and dose-dependent.
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    Hormone levels of people occupationally exposed to radiofrequencies.
    (Mbr Press Inc, 1999) Dasdag, S; Balci, K; Kaya, H; Çelik, MS
    The present article intended to investigate some hormone levels of technicians in the radio-broadcasting, television (TV) and radio - link stations. The study was carried out on 43 technicians from 20 to 59 years age occupationally exposed to radiofrequency (RF) and microwave (MW) radiation. 20 unexposed and voluntary persons from 20 to 59 years age were accepted as a control group. We determined the levels of some hormones as triiodothyronine (T-3), tetraiodothyronine (T-4), thyroid stimulant hormone (TSH), free T-4, estradiol, dehydroepiondrosterone sulfate (DHEA), testosterone, cortisol and progesterone in the technicians under investigation. The hormone levels of exposure groups were statistically compared with the unexposed control group. T-3, T-4, estradiol, testosterone and progesterone levels of technicians in the radio-link and TV transmitter stations were found to be significant (p<0.05, p<0.001). T-3, T-4, TSH, estradiol and progesterone levels of technicians in the broadcasting station were also found to be significant (p<0.001). In conclusion some hormone levels of technicians under investigation were altered by RF/MW.