Publication Date:
2021-05-19
Description:
Present study analyzed the stomach contents of individuals belonging to five fish’s species in order
toInvestigate seasonal changes in feeding strategy and diet composition in the South coast of the Caspian Sea
(Gilan and Mazandaran provinces) from late March until late May 2010 using the research ship Gillan and
fishing with batoom trawl nets and fishing blades insoles bony fishes in the depths of less than 60 meters.
The average length and the total weight of Rutilus frisii kutum, Rutilus rutilus caspicus, Cyprinus carpio, Liza
auratus and Liza saliens respectively were 36/9 ± 8/5 cm , 562/9 ± 353/2 g, 23/2 ± 3/2 cm , 202 ± 101/6 g, 24/6
± 8/1 cm , 249/8 ± 242 g, 32/2 ± 8/9 cm , 320/9 ± 242/8 g, 22/7 ± 2/6 cm and 82/9 ± 52/2 g repectively. Using
the method of Shorygin and Costello highly nourishing food strategy and different species of fishes were
studied. The results of this study showed that Rutilus frisii kutum fed generally of Balanus and Cerastorderma
In order of importance after Bivalvia, Gastropoda, Crabs, Fish eggs, Filamentous alge in GI Rutilus frisii kutum
presence, but feeding it of Bivalvia (in particular Cerastorderma) was much more than the other food. The
results of present study showed that under the influence of compatibility and behavioral mechanisms, ecological,
physiological and nutritional importance of Rutilus frisii kutum Bivalvia. The results of studies were showed
that Bivalvia was feeding the dominant Rutilus frisii kutum , while the results of this study showed that despite
Bivalvia present importance in feeding the of this species, it seems that its presence in such digestion decreased.
As well as the dominant food of Rutilus rutilus caspicus was fish, but generally from Detrite fed. This study
showed that feeding the dominant species of Cyprinus carpio, Liza auratus and Liza saliens of Detrite was. The
most important food items after ditrit for the Cyprinus carpio in order of importance include the Bivalvia,
Gastropoda, Oligochaeta, Abra ovata, Nereis, Fish eggs, Filamentous alge, was. The Liza auratus dietary habits
also showed that after ditrit the most importance in nutrition related to Foraminifera, Porifera and Balanus, and
for Liza saliens to Gastropoda, Bivalvia and Porifera.
The results showed that the mullet the greater the intensity of feeding fishes than other species were, Rutilus
frisii kutum in between of Cyprinidae the greater the intensity of feeding fishes than other species were (0/05 〉
P). The values of this indicator in the lower longitudinal in all fish species investigated were more than high
longitudinal groups. The feeding intensity at different times of sampling for all species investigated showed that
in all species at times extremely reduced the reproductive index (0/05 〉 P). As well as the diversity foods in the
lower longitudinal in all fish species investigated were more than high longitudinal groups. In conclution, our
results demonstrated Food strategy have changed based on physiological changes, metabolismi activity,
behaviour, and the amount of food available.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Dietary habits
;
Rutilus frisii kutum
;
Cyprinus carpio
;
Rutilus rutilus caspicus
;
Mullets
;
Survey
;
Feeding
;
Benthic
;
Liza auratus
;
Liza saliens
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
46pp.
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