OTHERS_CITABLE Age and growth of marbled sole Pleuronectoes yokohomae in Kikonai Bay, Hokkaido, Japan Age and growth of marbled sole Pleuronectes yokohamae werer estimated from growth increments in otolith. The samples were collected with commercial set nets and an experimental bottom trawl net in Kikonai Bay and the nearby waters, southern coast of Hokkaido, from May 1994 to July 1995. Monthly changes in the percentage occurrence of oltoliths with translucent edge in one band and the marginal increments on the other hand verified that the translucent zone was formed once a year after their spawning season in May, indicating availability of outer margin of translucent zone as an annulus. The regression method as well as Fraser-Lee's method was used to estimate the back-calculated lengths. Growth of marbled sole was expressed by the von Bertalanffy asymptotic growth function: TLt=361.78[1-exp-0.390(t-0.098)) for males and  TLt=438.15[1-exp-0.323(t-0.145)) for females using back-calculated lengths by the regression method and TLt=367.04[1-exp-0.388(t-0.114))] for males and TLt=436.05[1-exp-0.323(t-0.147)) for females by the Fraser-Lee's method, where TLt is total length (millimeters) at estimated age t. The theoretical lengths predicted by these two methods at all estimated ages were very similar. It was found that the growth rate of marbled sole in this study area was relatively high compared to those obtained in the Inland Sea of Japan as. However, the highest growth rate was observed with regard to the population off Fukushima Prefecture, although the bottom water temperatures were similar to those in Kikonai Bay. It is inferred that the geographical variation in the growth rates of marbled sole is influenced by the hydrographic and food conditions. http://jifro.ir/article-1-3186-en.pdf 2017-12-13 5 22 Age Growth Otolith Marbled sole Geographical variation M.M. Shafieipour ifro@dci.iran.com 1 AUTHOR T. Takahashi 2 AUTHOR K. Ishino 3 AUTHOR T. Takatsu 4 AUTHOR T. Nakatani 5 AUTHOR
OTHERS_CITABLE 2. Polymerase Chain Reaction (PCR) and direct sequencing of mtDNA from the ND5/6 gene region in Persian strugeon Acipenser persicus from the southern Caspian Sea A partial sequence of the mtDNA ND5 gene region was used for population study in Persian sturgeon (west and east areas of southern Caspian Sea). The result showed that although this approach was informative for phylogenetic study in sturgeon, it was less informative for population study in Persian sturgeon.  http://jifro.ir/article-1-3187-en.pdf 2017-12-13 23 34 Polymerarase Chain Reaction mtDNA Sturgeon Caspian Sea S. Rezvani Gilkolaei S-rezvani@ifro.neda.net.ir 1 AUTHOR D.O.F. Skibinski 2 AUTHOR
OTHERS_CITABLE 3. Myxosporean parasites from mesopotamian part of Iran A survey on myxosporean parasites of freshwater fishes from Mesopotamian part of Iran (south western part of the country, Khuzestan Province) was carried out. Some 280 individuals belonging to 14 different species were examined the prevalence of myxosporean parasites, morphology of the spores, plasmodial development, the infective site, and characteristics of the cyst location using the histological approach. The collected parasites were as follows: Myxobolus presicus, M. karuni, M. bulbocordis, M. nodulointestinalis, M. iraanicus, M. mesopotamiae, M. shadgani, M. sharpeyi, M. molnari and M. mokayeri. Barbus sharpeyi and B. grypus, economically important fishe, were infected by six and four myxosporean parasites respectively. All of the studied cases of infection were observed in the natural waters. http://jifro.ir/article-1-3188-en.pdf 2017-12-13 35 46 Mesopotamian Myxosporean Myxobolus Barbus Iran M. Masoumian 1 AUTHOR J. Pazooki 2 AUTHOR
OTHERS_CITABLE Herbicides and insecticides effects on green algae and cyanobacteria strain The toxic effects of herbicides (Machete, Saturn) and pesticides (Diazinon and Malathion) on green algae, Scenedesmus obtusiusculus, and cyanobacteria, Anabaena flos aquae, were studied. The results indicated that Machete and Saturn, in comparison to Diazinon and Malathion, were more toxic. On the other hand it was revealed that green algae was more sensitive to the pesticides than the cyanobacteria. When we added 3.199 mg/l machete (EC50 of this toxicant for Anabaena flos aquae) to a mix algal culture, the growth rate of green algae after 6 days of treatment was reduced 0.95 times, while it was 4.5 for the cyanobacteria. Treating the culture with 10.53 mg/l of Saturn for the same period of time revealed that the growth rate for green algae and the cyanobacteria increased 1.19 and 7 times, respectively. Hence, we can conclude that pesticides are capable of decreasing the diversity of the phytoplankton species in an aquatic ecosystem that from the fisheries point of view could cause serious problems. http://jifro.ir/article-1-3189-en.pdf 2017-12-13 47 58 Herbicide Pesticide Algae Toxicant Pollution M. Piri 1 AUTHOR V. Ördog 2 AUTHOR
OTHERS_CITABLE In Vivo oocyte maturation and ovulation in females and spermiation in males of hybrid sturgeon, bester Bester, a hybrid sturgeon (Huso huso L. females ´ Acipenser ruthenus L. males), neither spermiate nor ovulate in the captivity. Thirteen-year-old adult male and female bester were injected with LH-RHa (0.1-0.3 mg/kg B.W.) intramuscularly and spawning status of the treated fish was checked 24-48 hours later. Additionally, changes in serum levels of DHP in both the responded and the non-responded individuals were monitored 0, 1, 3, 6, 9, 12, 24, 48 and 72 hours after treatment. Between 70-100 percent of the LR-RHa injected males individuals, and 11-40 percent of the females spawned 24-48 hours after the treatment; the rest did not respond to the injection. In the responded males, 3-9 hours after the treatment, serum levels of DHP increased; while in the females it occurred first after 12-24 hours. In contrast, during the same period, serum levels of DHP remained low in all non-responded individuals. The present study indicated that using 0.1-1.3 mg/kg B. W. of LH-RHa can induce oocyte maturation and ovulation in the females and spermiation in the males cultured bester. The results suggested additionally DHP as an appropriated steroid that could be used in the final maturation stage of the gonads. http://jifro.ir/article-1-3190-en.pdf 2017-12-13 59 66 Bester Oocyte maturation Ovulation Spermiation DHP LH-RHa B. Mojazi Amiri bmamiri@chamran.ut.ac.ir 1 AUTHOR M. Maebayashi 2 AUTHOR N. Omoto 3 AUTHOR S. Adachi 4 AUTHOR K. Yamauchi 5 AUTHOR
OTHERS_CITABLE Gonadal changes and serum steriod levels during the annual reproductive cycle of the pearl oyster Pinctada fucata gould The annual reproductive cycle of peal oyster Pinctada fucata was characteised by documenting gonadal development and changes in serum levels of estradiol-17b (E2), testosterone (T) and progesterone (P) in the wild bivalve caught in natural beds in the Persian Gulf throughout the year. Bivalve populations employed in this study spawn in June-July and November-December. The pearl oysters had group synchronous ovarian development with exogenous vitellogenesis during spring and summer for first spawning and during August-September for the second spawning. Serum E2 levels in the females increased rapidly from low values in May to peak in June and also in October coinciding with the time of spawning. Serum T levels in male and female exhibited a bimodal pattern. However in the male it increased during the early spermatogenesis. P was detected in both females and males. Its concentrations start to increase during the early gametogenesis and reaching to peak during the spawning season. The obtained results indicated that vitellogenesis and spermatogenesis in pearl oyster are not completed by the mi-summer and early winter. http://jifro.ir/article-1-3191-en.pdf 2017-12-13 67 75 Steroid hormones Gametogenesis Pinctada fucata Persian Gulf S. Jamili 1 AUTHOR G. Amini 2 AUTHOR S. Oryan 3 AUTHOR