State and Dynamics of the Bioresources in the Caspian Sea

Khodorevskaya, R. P.; Kim, Yulia; Shahifar, Reza; Mammadov, Elchin; Katunin, D. N.; Morozov, B. V.; Akhundov, M M; Muradov, Orazmuhammet; Velikova, Violeta

doi:10.1007/698_2014_287

Cited by 12 publications

(8 citation statements)

References 2 publications

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“…But as Khodorevskaya et al. () reported, if the current threatened factors such as habitat destruction, environmental degradation, overexploitation, poaching and illegal trade continue into the next few years, the five species of sturgeon populations, especially Russian sturgeon will be close to extinction in the Caspian Sea. Therefore, to have rational management on sturgeons stocks, all factors should be taken into consideration and a coordinated regional and international effort is highly advisable to provide immediate implementation of stock enhancement and management in the Caspian Sea.…”

Section: Discussionmentioning

confidence: 99%

Population ecological parameters and stock assessment of Russian sturgeonAcipenser gueldenstaedtiBrandt & Ratzeburg, 1833 in the Southern Caspian Sea

et al. 2018

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Russian sturgeon (Acipenser gueldenstaedti Brandt & Ratzeburg, 1833) is one of the major commercial sturgeon species, but there is no adequate information and previous‐published about population dynamics and stock assessment of this species in the southern Caspian Sea. This paper examines the age structure, growth parameters, maturity, age at first capture, optimum length, natural and fishing mortality and amount of biomass in the southern Caspian Sea (Iranian waters), during a two decades time series period from 1990–1991 to 2008–2009. For a pooled data, the growth parameters were estimated as L∞ = 214.0 cm, K = 0.054, t0 = −4.5 year. Size at fifty percent sexual maturity was at FL = 118 cm for females and 113 cm for males. The age at first capture (tc) estimated to be 12.1 years. In the catch composition, bulk of the catch (75%) belonged to 13–17 years old. The instantaneous coefficient of natural mortality (M) was estimated as 0.120 year−1 and the instantaneous coefficient of fishing mortality (F) varied during the 19‐year period between 0.130 to 0.505 year−1. The biomass showed a descending trend from 1,941.2 mt in 1990–1991 collapsed to about 55 mt in 2004–2005, and then decreased to the lowest level and represented 18.5 mt in 2008–2009. The result revealed that, the stock of Russian sturgeon is being over‐fished. We concluded that to manage the sturgeons stocks, a coordinated regional and international effort are needed to provide immediate implementation of stock enhancement and management in the Caspian Sea.

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Section: Discussionmentioning

confidence: 99%

Population ecological parameters and stock assessment of Russian sturgeonAcipenser gueldenstaedtiBrandt & Ratzeburg, 1833 in the Southern Caspian Sea

et al. 2018

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“…For example, registered sturgeon catches peaked in the late 1980's. A few years later, the fishing fleet was largely dismantled and anglers started to harvest sturgeons without formal regulation (Khodorevskaya et al, 2014;Mammadov et al, 2016;Strukova et al, 2016). Our results indicate that poaching is still a major concern (Fig.…”

Section: Contribution Of Individual Pressures To the Cumulative Pressmentioning

confidence: 80%

“…Unfortunately, our knowledge about the impact of environmental and anthropogenic factors on the native biodiversity in the Caspian Sea is largely biased towards few key stressors related to natural water-level fluctuations and human activities, such as fishery and mineral extraction (Malinovskaja et al, 1998;Agah et al, 2007;Zinchenko, 2010, 2011;Khodorevskaya et al, 2014;Yanina, 2014;Latypov, 2015;Mammadov et al, 2016;Poorbagher et al, 2017). Moreover, most previous human impact studies in the Caspian Sea are restricted to coastal areas (Nasrabadi et al, 2011;Aliyeva et al, 2013;Bastami et al, 2014), individual countries (Aliyeva et al, 2013;Dmitrieva et al, 2013;Bastami et al, 2014;Yancheshmeh et al, 2014;Mashroofeh et al, 2015;Varnosfaderany et al, 2015) or selected target species (Bickham et al, 1998;Agah et al, 2007;Dmitrieva et al, 2013;Ermolin and Svolkinas, 2016;Poorbagher et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Differential impact of anthropogenic pressures on Caspian Sea ecoregions

Lattuada

Albrecht

Wilke

2019

Marine Pollution Bulletin

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Over the past decades, overall ecological conditions in the Caspian Sea have deteriorated. However, a comprehensive understanding of lake-wide spatial differences in anthropogenic pressures is lacking and the biological consequences of human impacts are poorly understood. This paper therefore aims at assessing the individual and combined effects of critical anthropogenic pressures on the Caspian Sea ecoregions. First, cumulative pressure scores were calculated with a cumulative environmental assessment (CEA) analysis. Then, the individual contribution of anthropogenic pressures was quantified. Finally, ecoregion-specific differences were assessed. The analyses show that both cumulative and individual pressure scores are unevenly distributed across the Caspian Sea. The most important individual pressures are invasive species, chemical pollution and poaching. This uneven distribution of pressure scores across Caspian Sea ecoregions creates new challenges for future conservation strategies, as different ecoregions usually require different conservation measures.

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“…Bycatch of juvenile and young A. persicus sharply increased on the eastern coasts of the Caspian Sea from 2000 to 2004, and was expected to increase into the 2010s with effective regulation in the whole Caspian Sea (Moghim et al (2006). However, stocks of all five species declined sharply and were critically endangered (Fazli et al, 2020(Fazli et al, , 2021Fazli, Kaymaram, & Daryanabard, 2022;Khodorevskaya et al, 2014;Ruban & Khodorevskaya, 2011;Tavakoli et al, 2019). In the present study, a bycatch of juvenile and young sturgeon since 2006 was used to assess the status of these species' populations.…”

mentioning

confidence: 85%

Spatial and temporal trends in the relative abundance of Caspian sturgeon during 2006–2022

Fazli,

Abdolmaleki,

Kaymaram

et al. 2023

Fisheries Management Eco

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We used the bycatch of Caspian sturgeon to quantify the species composition, length structure, spatial and temporal distribution, temporal dynamics of relative abundance (indexed as catch‐per‐unit‐effort, CPUE), effects of fingerlings released, and to forecast future sturgeon stock status. Dynamic factor analysis of temporal changes in species CPUE was used to quantify relationships to environmental variables (sea surface temperature, chlorophyll‐a, sea surface level, and river discharge) during 2006–2022. We found that the Guilan subarea had the lowest relative abundance and differed from all other subareas. Fish abundance was highest in October and November, particularly in Mazandaran and Golestan coastal waters. Relative fish abundance declined significantly over time. Acipenser persicus was the most abundant species, followed by Aciperser gueldenstaedtii, Aciperser stellatus, Aciperser nudiventris, and Huso huso. The annual number of fingerlings released decreased during 2000–2021. Over the years, environmental variables such as sea surface level, sea surface temperature, and chlorophyll‐a showed different trends, with sea surface temperature generally increasing, chlorophyll‐a generally decreasing, sea surface level decreasing nearly linearly, and river discharge varying erratically without a trend in the southern Caspian Sea during 2006–2022. The relative abundance of all species decreased and was significantly related to sea surface level. Fish abundance was forecasted to decline by 2025, as sea surface temperature increases and sea surface level decreases. Illegal, unreported, and unregulated (IUU) harvest of sturgeon must be effectively regulated to ensure the survival and recovery of sturgeon populations in the Caspian Sea.

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State and Dynamics of the Bioresources in the Caspian Sea

Cited by 12 publications

References 2 publications

Population ecological parameters and stock assessment of Russian sturgeonAcipenser gueldenstaedtiBrandt & Ratzeburg, 1833 in the Southern Caspian Sea

Population ecological parameters and stock assessment of Russian sturgeonAcipenser gueldenstaedtiBrandt & Ratzeburg, 1833 in the Southern Caspian Sea

Differential impact of anthropogenic pressures on Caspian Sea ecoregions

Spatial and temporal trends in the relative abundance of Caspian sturgeon during 2006–2022

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