Publication Date:
2021-05-19
Description:
The study is part of a research project on the southern shores of the Caspian Sea (Mazandaran watersKelarabad)
was conducted in 2012. The aim of this study was to evaluate the effects of fish farming in
cages on the distribution, abundance and biomass of macrobenthos organisms in the water at a depth
of 20 meters Kelarabad. Sampling was monthly at three stations including 1(seating cage), 2 (control
with a distance of 500 m) and 3 (50 meters after the cage) using a grab with 30 cm diameter. A total of
6 groups of benthic organisms, including 2 branches, 2classes, 4 families and 6 species were
identified. Overall, 23442 specimens of large benthic organisms were counted, the lowest and highest
frequency at stations 1 (23.4%) and 2 (46.8%), respectively. The results showed that the highest
abundance at station 2 with an average of 646.00±1230.43 N/m2 and biomass with 0.526±1.00 g/m2 in
station 3, in which can be due to the lack of cage fish farming activity and the presence of big species
to depend Cerastoderma lamarki, respectively. The highest abundance and biomass was in autumn
with mean 888.3±1371.58 N/m2
and 0.524±0.887 g/m2
and lowest was in winter with mean
143.33±138.22 N/m2
and 0.070±0.078 g/m2
. This could be related to activity fish cage culture and
wintering season. The Streblospio gynobranchiata of polychaeta dominant benthic organisms with
large population accounted 93.3%. This could be due to exotic species, high power compatibility and
suitability related to environmental conditions. The conclusion is that the abundance and biomass of
macrobenthos organisms in station 1 was less than other stations in which can be duo to concerned
fish cage activity and its effects on organisms’ infauna. Therefore, it is suggested that any activity in
the Caspian Sea offshore aquaculture should maintain environmental considerations and
implementation of detailed environmental impact assessment (EIA) projects.
Description:
Published
Keywords:
Cage culture
;
Cerastoderma lamarki
;
Streblospio gynobranchiata
;
Distribution
;
Abundance
;
Biomass
;
Macrobenthos
;
Fish
;
Culture
;
Water
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Refereed
Format:
pp.91-102
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