A Multi-species modeling approach to consider the effects of environmental parameters on Caspian sturgeon fishes stock status

Fazli, Hasan; Khoshghalb, Mohammad Reza Behrouz; Abdolmaleki, Shahram

doi:10.1016/j.rsma.2022.102666

Cited by 7 publications

(8 citation statements)

References 41 publications

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“…We found that sea surface level was an important predictor of sturgeon relative abundance, which is consistent with other studies of environmental factors that directly impact fisheries resources in the Caspian Sea ecosystem (Arpe et al, 2000;Beyraghdar Kashkooli et al, 2017;Fazli, Kaymaram, & Daryanabard, 2022;Fazli, Khoshghalb, & Abdolmaleki, 2022;Mamedov, 2006;Seyedvalizadeh et al, 2020). In addition, sea surface level is related to the North Atlantic Oscillation (NAO), which influences precipitation of the Volga region (Arpe et al, 2000).…”

Section: Discussionsupporting

confidence: 92%

“…The index of relative abundance (CPUE) we used for stock assessment could be an indicator of abundance (Maunder & Punt, 2004; Myers & Worm, 2003). The CPUE of all adult sturgeons has been decreasing in the Caspian Sea from 1990 to 2014 (Fazli, Khoshghalb, & Abdolmaleki, 2022). Our results showed that the decreasing trend in CPUE continued from the mid‐2000s to the 2010s, which is consistent with previous studies that have shown declining sturgeon populations in the Caspian Sea (Fazli et al., 2020, 2021; Fazli, Kaymaram, & Daryanabard, 2022; Fazli, Khoshghalb, & Abdolmaleki, 2022; Khodorevskaya et al., 2014; Ruban & Khodorevskaya, 2011; Tavakoli et al., 2019).…”

Section: Discussionmentioning

confidence: 99%

“…The CPUE of all adult sturgeons has been decreasing in the Caspian Sea from 1990 to 2014 (Fazli, Khoshghalb, & Abdolmaleki, 2022). Our results showed that the decreasing trend in CPUE continued from the mid‐2000s to the 2010s, which is consistent with previous studies that have shown declining sturgeon populations in the Caspian Sea (Fazli et al., 2020, 2021; Fazli, Kaymaram, & Daryanabard, 2022; Fazli, Khoshghalb, & Abdolmaleki, 2022; Khodorevskaya et al., 2014; Ruban & Khodorevskaya, 2011; Tavakoli et al., 2019). Based on our forecasting, the CPUE of all species will continue into the future and be close to zero in 2025.…”

Section: Discussionmentioning

confidence: 99%

“…Each seine haul was treated as a single unit of effort. The fishing season began in mid‐October (mean SST = 22.6°C) and closed in mid‐April (mean SST 14.1°C; Fazli, Khoshghalb, & Abdolmaleki, 2022). Length at maturity (FL) of sturgeons was 90 cm for A .…”

Section: Methodsmentioning

confidence: 99%

“…To achieve our objective, as a single unit of effort. The fishing season began in mid-October (mean SST = 22.6°C) and closed in mid-April (mean SST 14.1°C; Fazli, Khoshghalb, & Abdolmaleki, 2022). Length at maturity (FL) of sturgeons was 90 cm for A. stellatus, 113 cm for A. persicus, A. gueldenstaedtii, A. nudiventris, and 165 cm for H. huso (Moghim et al, 2006).…”

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confidence: 99%

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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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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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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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Tracking the migration and distribution of Caspian Kutum (Rutilus kutum, Kamenskii, 1901) along the southern coastline of the Caspian Sea based on stable isotope analysis

Abbasi,

Ghorbani,

Salmanmahiny

et al. 2024

Aquatic Conservation

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Animal movements and resource utilization are essential factors for effective environmental management, but they are difficult to quantify in extensive natural ecosystems such as the aquatic environment. Stable isotope analysis is an ecological tracer technique that reveals information about links between trophic levels, movement patterns of migratory species or geographical variations due to the different aquatic processes that influence them. The Caspian kutum is an important commercial endemic species on the southern coasts of the Caspian Sea and can be used as a proxy to gain information on how different spatiotemporal, environmental and biological—variables can influence ecological tracers such as stable isotopes at the sea basin level. Thus, the main objective of this study is to investigate how spatiotemporal, isotopic baseline and environmental factors influence the distribution of stable isotopes in the Caspian kutum. The results showed that although there are individual variations, there is an overall increasing trend in δ13C and a decreasing trend in δ15N from the western to the eastern regions. In addition, there is a decreasing trend in δ13C and an increasing trend in δ15N with increasing age. It seems that among other migration routes of this species from the northern part of the southern Caspian Sea to the southern coasts, one of the main migration routes of this fish on the coasts of Iran is west‐east mobility, which may affect the efficiency of sustainable management of the catch in various fishing areas. This was the first study to establish a migratory pattern of the Caspian kutum based on stable isotopes. We advocate the wider stable isotopes to effectively investigate fish migratory, as the results from this study provided important contributions to the development of valuable insights for the management and sustainability for this threatened and declining species fish populations.

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Aliphatic hydrocarbons in fin spines of adult sturgeon (Acipenser stellatus) and their relationship with potentially toxic elements in the northern and southern regions of the Caspian Sea

Bakhshalizadeh,

Nasibulina,

Kurochkina

et al. 2024

Environ Sci Pollut Res

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Currently, the pollution of the Caspian Sea by the oil industry is one of the highest problems in this area. Critically endangered species inhabit this sea, such as sturgeons, whose ecological value is incalculable. Thus, we aimed to evaluate the level of contamination of aliphatic hydrocarbons of petroleum and its relation with several toxic elements directly on sturgeons spines. A total of 40 adult starry sturgeons (Acipenser stellatus) were obtained within a repopulation programme in the northern and southern coastal waters of the Caspian Sea. The marginal pectoral fin was extracted from each fish to determine aliphatic hydrocarbons, arsenic, cadmium, mercury, nickel, lead, and vanadium. Subsequently, the sturgeons were released. Clearly, the presence of hydrocarbons was evidenced in all the sampled areas finding higher concentrations in the northern areas (N1 = 1.35 ± 0.4; N2 = 1.65 ± 0.46; N3 = 1.27 ± 0.40; S1 = 0.61 ± 0.22; S2 = 0.85 ± 0.43 mg/kg). Furthermore, to a greater or lesser extent, some toxic elements, mainly Hg and As, have been linked to aliphatic hydrocarbons.

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A Multi-species modeling approach to consider the effects of environmental parameters on Caspian sturgeon fishes stock status

Cited by 7 publications

References 41 publications

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

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

Tracking the migration and distribution of Caspian Kutum (Rutilus kutum, Kamenskii, 1901) along the southern coastline of the Caspian Sea based on stable isotope analysis

Aliphatic hydrocarbons in fin spines of adult sturgeon (Acipenser stellatus) and their relationship with potentially toxic elements in the northern and southern regions of the Caspian Sea

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