علوم زیستی دریا
Fatemeh Nazarhaghighi; m z; n sh
Abstract
In order to study of reproductive stages of Caspian Sea Amphipod the sampling was made in southern coasts of Caspian sea( Jefrood beache). Amphipods transferred to laboratory with some their native sediment. Samples were maintained in controlled laboratory condition as temperature of 2510C, salinity ...
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In order to study of reproductive stages of Caspian Sea Amphipod the sampling was made in southern coasts of Caspian sea( Jefrood beache). Amphipods transferred to laboratory with some their native sediment. Samples were maintained in controlled laboratory condition as temperature of 2510C, salinity of 9± 0.5 ppt and a 12 hrs light - dark regime. The average priod spent in precopula stage was about 2.6±0.91 days and embryonic development took about 8.5 ±1.05 days. The fecundity was estimated as the number of fertilized eggs existing in brood pouch of each female(14.125). first precopula was observed after about 40 days of birth.To assay Assay of various feed composition on growth of Gammarus, of similar size of Gammarus were fed by composite food of (fish- potato), (fish- bread) , (fish-leaf), (leaf-potato), (leaf-bread) , (bread-potato). At the end of 6th week the head of all specimens were measured. The obtained result of statistically analyzed and showed, significant difference between the treatments (p0.05) The combined potato- bread food was determined the most suitable food to feed Gammarus.
haleh rahmani; Nader Shabanipour; S. Ali Rozati
Volume 11, Issue 3 , November 2012, , Pages 91-100
Abstract
The optomotor response is one of the methods used for measuring zebrafish behavior towards moving objects. The present research has been carried out on zebrafish reaction to moving objects. In the experiment, newly fish matured of both sexes were used. To study the optical power of zebrafish an appropriate ...
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The optomotor response is one of the methods used for measuring zebrafish behavior towards moving objects. The present research has been carried out on zebrafish reaction to moving objects. In the experiment, newly fish matured of both sexes were used. To study the optical power of zebrafish an appropriate apparatus was designed. Experiments were performed with different widths of stripes in black , white (1, 2 , 7 cm) , with width stripes of 1 cm in red - gray , green - gray at different velocities of 2, 3, 4, 7, 10 , 15 rpm. Results of 2-way ANOVA showed significant differences between the various widths, velocities (P<0.05). Evaluation of results showed that at different widths , fish showed the most optomotor response at a velocity of 10 rpm (0.65±0.13) , the lowest response to velocity was shown at 2 rpm (-0.07±0.22) . Furthermore, the best visibility was observed with 1 cm width (0.70±0.13) (P<0.05). Experiment on color vision also showed that at different velocities , various colored strips, there is no significant difference (P>0.05). Nevertheless, the fish demonstrated the most optomotor response to green - gray color (0.10±0.13), a velocity of 10 rpm (0.41±0.13).