Publication Date:
2021-05-19
Description:
This study have been conducted entitle biological and statistical sturgeon in the southern Caspian Sea
(Mazandaran waters)” from 2009 to 2013. Sampling was manthly. Overal, 1859 specimens of different species
of sturgeon was caught including Acipenserpersicus (69%), A. stellatus (19%), Husohuso (6%), A. nudiventris
(4%) and A. guldenstaedtii (2%). Totally, the meat and caviar of five species were found 53263.6 kg and 5633
kg respectively and caviar to meat ratio was 10.6%. The results show that ration of meat and caviar whole
species reduced from 2009 to 2012 in which the meat and caviar of A. persicus was declined from 12146 to 4465
kg in meat and caviar from 1358 to 487 kg were extremely reduced respectively. The CPUE (catch per unit
effort) of sturgeon has fluctuated from 2009 to 2012. Totally, the CPUE of A. persicus was decreased from 0.150
(2009) to 0.130 (2012) kg boat per day, A. stellatue from 0.009 (2009) to 0.021 (2012) kg boat/day, A.
guldenstaedtii from 0.002 (2009) to 0.003 (2012) kg boat/day, A. nudiventris from 0.027 (2009) to 0.001 (2012)
kg boat/day and H. huso from 0.123 (2009) to 0.018 (2012) kg boat /day. 1061 specimens of fish has been
caviar including A. persicus with 69%, A. stellatus (18.1%), H. huso (5.5%), A. guldenstaedtii (2.7%). The
frequency of caviar categorize was included 1 , 2, 3 and massive with 49.6%, 38%), 10.6% and 1.9% ,
respectively. The highest of meat and caviar belong to A. persicus with 31414 kg and 3515.7 kg, respectively
were found and the lowest was 841kg and 105.9 kg pertain to A. guldenstaedtii. The results show that 65.9% of
sturgeon was caught by legal catch (landing) and 34.1% by beach seine remained. 391 individuals was age
determined that the minimum and maximum age was 9 and 41 year comprised to H.huso and A. stellatus,
respectively. A. persicus and A. stellatus were majority caught compare to other species. A. persicus has the
highest frequency in 14-15 year age groups with 50% and 57% in 2009 and 2011, respectively and 15-16 year
age group with 41% and 56% in 2010 and 2012, respectively. The results show that mean of fork length, body
weight, caviar weight of A. persicus was declined because the FL and weight average (±SD) obtained from
152.4±16.7cm and 25.8±9.2 kg in 2009 to 146.5± 18.7cm and 22.1±9.2kg in 2012, respectively. In contrast, the
average (±SD) FL and weight of H. huso was increased from 218.8±41.1cm and 137.3±96.6kg in 2009 to
231.3±45.2cm in FL and 146.2±78.5kg body weight in 2012, respectively. Consequently, the results show that
stocks of sturgeon in the Caspian Sea has a trend declined because of some species in IUCN categorize list was
Endangered in 2006 but at this moment lie in Critically Endangered list of IUCN categorize were down which
could be a serious alarm for the valuable sturgeon fish in the Caspian Sea. Therefore, recommendation that trade
catch of sturgeon in the Caspian Sea must be forbidden and continue legal catch for spawner fish that needede to
artificial propagation only.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Biology
;
Sturgeons
;
A. persicus
;
A. stellatus
;
A. guldenstaedtii
;
A. nudiventris
;
H. huso
;
CPUE
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
98pp.
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