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Demographics of great sturgeon (Huso huso) in Iranian waters of the Caspian Sea (2008–2010)

Shima Bakhshalizadeh

Shima Bakhshalizadeh

Department of Marine Science, Caspian Sea Basin Research Center, University of GuilanRasht, Iran
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Bakhshalizadeh, Shima
, 
Ali Bani

Ali Bani

  • Department of Marine Science, Caspian Sea Basin Research Center, University of GuilanRasht, Iran
  • Department of Biology, Faculty of Science, University of GuilanRasht, Iran
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Bani, Ali
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Shahram Abdolmalaki

Shahram Abdolmalaki

International Sturgeon Research Institute, Agricultural Research, Education and Extension Organization (AREEO)Rasht, Iran
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Abdolmalaki, Shahram
 e 
Jesus T. Ponce Palafox

Jesus T. Ponce Palafox

National School of Fisheries Engineering, Autonomous University of NayaritMexico
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Ponce Palafox, Jesus T.
  
02 set 2021
Demographics of great sturgeon (Huso huso) in Iranian waters of the Caspian Sea (2008–2010)'s Cover Image
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Categoria dell'articolo: Original research paper
Pubblicato online: 02 set 2021
Pagine: 325 - 332
Ricevuto: 21 dic 2020
Accettato: 12 feb 2021
DOI: https://doi.org/10.2478/oandhs-2021-0027
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© 2021 Shima Bakhshalizadeh et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Sampling locations (red closed circles) of sturgeon in the Iranian coastal waters of the Caspian Sea
Sampling locations (red closed circles) of sturgeon in the Iranian coastal waters of the Caspian Sea

Figure 2

Length–weight relationship for female (open circles and dotted line) and male (closed circles and solid line) great sturgeon in the Iranian coastal waters of the Caspian Sea; W = gutted weight (kg); FL = fork length (cm)
Length–weight relationship for female (open circles and dotted line) and male (closed circles and solid line) great sturgeon in the Iranian coastal waters of the Caspian Sea; W = gutted weight (kg); FL = fork length (cm)

Figure 3

Age composition for female and male great sturgeon between 2008 and 2010 in the Iranian coastal waters of the Caspian Sea (n = 105). Arrows indicate the direction in which the observed frequencies differed from those expected under the assumption that the age class was uncorrelated with sex.
Age composition for female and male great sturgeon between 2008 and 2010 in the Iranian coastal waters of the Caspian Sea (n = 105). Arrows indicate the direction in which the observed frequencies differed from those expected under the assumption that the age class was uncorrelated with sex.

Figure 4

The von Bertalanffy growth function fit to size-at-age relationships for female (open circles and dotted line) and male (closed circles and solid line) great sturgeon in the Iranian coastal waters of the Caspian Sea; Lt = fork length (cm)
The von Bertalanffy growth function fit to size-at-age relationships for female (open circles and dotted line) and male (closed circles and solid line) great sturgeon in the Iranian coastal waters of the Caspian Sea; Lt = fork length (cm)

Figure 5

Confidence regions (95%) of mean estimates for the growth parameters (K and L∞) for males and females of great sturgeon in1990–1994 and in 2008–2010 in the Iranian coastal waters of the Caspian Sea
Confidence regions (95%) of mean estimates for the growth parameters (K and L∞) for males and females of great sturgeon in1990–1994 and in 2008–2010 in the Iranian coastal waters of the Caspian Sea

Descriptive length and weight composition of male and female great sturgeon from the Iranian waters of the Caspian Sea in 2008–2010

Size Sex Number Mean Standard error of the mean Minimum Maximum
Fork Length (cm) Female 33 214.17 7.06 84 305
Male 24 194.17 8.10 84 255
Weight (kg) Female 33 111.26 10.70 4 287
Male 24 69.77 6.72 4 141
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