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Mean trophic level of coastal fisheries landings in the Persian Gulf (Hormuzgan Province), 2002–2011

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Abstract

Fishing activities can alter the structure of marine food webs by the selective removal of some species. The changes in the marine food webs of the Hormuzgan waters of the Persian Gulf, Iran were assessed, based on estimates of the mean trophic index (MTI) and Fishing in Balance index (FiB), and on landing profile of the exploited marine community (49 species) during the period, 2002–2011. The total landings (Y t) (R=0.88, P<0.001) increased gradually while the Y t of carnivores has slightly declined, and the Y t of herbivores, detritivores and omnivores has increased. Consequently, the MTI significantly decreased (R =-0.69, P<0.05) at a rate of 0.11 during this decade. The MTI showed a decreasing trend, which indicates exploitation of marine resources. The FiB index also showed a downward trend and negative values from 2002 to 2009, which may be associated with unbalanced structure in the fisheries, but an upward trend from 2009 to 2011. The time variation of the landing profile showed two periods with significant diff erences in their species composition (R=0.88; P =0.005), and based on analysis of similarity, species have been identified as discriminator species, namely Thunnus albacores and Benthosema pterotum. Results indicate that changes in MTI reflected changes in the Hormuzgan landing structure. The examination of the MTI, FBI, and landing profile (LP) temporal pattern suggests that the status of fishery resources in Hormuzgan inshore waters is overexploited, and provides evidence of the probability that a fishing down process is occurring in this area, and that this trend may continue in the long-term. Therefore, environmental fisheries management and conservation programs should be prioritized for these valuable resources.

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Acknowledgement

We are grateful to the Iranian National Organization of Fisheries through which annual landings data (2002–2011). The authors wish to thank Dr. Mohammad Momeni, Hadi Raeisi and Ehsan Ebraahimi for their help and comments.

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Authors and Affiliations

  1. Marine Biology Department, Faculty of Marine Science and Technology, Hormuzgan University, Bandar-e-abbas, Iran

    Marzieh Razzaghi, Sakineh Mashjoor & Ehsan Kamrani

  2. Young Researchers Club, Bandar-e-abbas Branch, Islamic Azad University, Bandar-e-abbas, Iran

    Marzieh Razzaghi

  3. Young Researchers Club, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

    Sakineh Mashjoor

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  1. Marzieh Razzaghi
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  2. Sakineh Mashjoor
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  3. Ehsan Kamrani
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Correspondence to Sakineh Mashjoor.

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Razzaghi, M., Mashjoor, S. & Kamrani, E. Mean trophic level of coastal fisheries landings in the Persian Gulf (Hormuzgan Province), 2002–2011. Chin. J. Ocean. Limnol. 35, 528–536 (2017). https://doi.org/10.1007/s00343-017-5311-6

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  • DOI: https://doi.org/10.1007/s00343-017-5311-6

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