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IJFS 2020, 19 Back to browse issues page
Research Article: Trophic dynamics analysis and ecosystem structure for some fish species of northern Oman Sea
M. Tajzadeh Namin, T. Valinassab *, E. Ramezani- Fard, F. Ehteshami
Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO). Tehran, Iran. , t_valinassab@yahoo.com
Abstract:   (144 Views)
In the present study, a trophic structure model for some fish species of the northern Oman Sea is developed through using mass balance modeling software, Ecopath with Ecosim (EwE). In this model, we simulated 16 functional groups spread across an area of 3998.20 km2 from 2017 to 2018. Mean trophic level in the area of the present study was 3.49. Values calculated for system omnivory and connectance indices were 0.42 and 0.44, respectively. However, the values of ecotrophic efficiency in the model were high (>0.5) for most consumers of high trophic levels except for sharks and rays because of their high fishing mortality. Accordingly, mixed trophic impact showed that phytoplankton and detritus positively impacted almost all ecological groups. Also bentho-pelagics, the medium demersals, benthos, and crustaceans had a very negative impact on themselves due to cannibalism. Furthermore, the highest realized trophic level was 4.34 for sharks. The maximum omnivory index is calculated as 0.99 for medium demersals for feeding on a wide variety of preys. Also, the average catch per net primary production, i.e., the gross efficiency of the system was around 0.000198 (lower than the global average) indicating that the fishery is harvesting fishes high in the food chain. The primary production/respiration (PP/R) ratio is found to be 3.57 and the values of ascendancy (45.40%) and overhead (54.60%) showed stability of the ecosystem. Thus northern Oman Sea can be classified as an immature ecosystem (in the developmental stage), although it has some kind of system maturity. Accordingly, the food web of northern Oman Sea is consisted mostly of detritivorous, planktivorous, and carnivorous fish species. Besides, Ecopath with Ecosim (EwE) software can be an excellent option to examine interactions among ecological groups, and the impact of fishing in northern Oman Sea which is unquestionably helpful to develop concrete management strategies. The proper ecosystem-based fisheries management practice can improve the efficiency of this overexploited ecosystem.
Keywords: Connectance index, Ecopath, Ecotrophic efficiency, Fishery management, Omnivory index, Mixed trophic impact
Full-Text [PDF 778 kb]   (33 Downloads)    
Type of Study: Orginal research papers | Subject: Ecology
Received: 2020/05/2 | Accepted: 2020/07/1 | Published: 2020/11/20
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Tajzadeh Namin M, Valinassab T, Ramezani- Fard E, Ehteshami F. Research Article: Trophic dynamics analysis and ecosystem structure for some fish species of northern Oman Sea. IJFS. 2020; 19 (6) :2804-2823
URL: http://jifro.ir/article-1-4312-en.html


Volume 19, Issue 6 (2020) Back to browse issues page
مجله علوم شیلاتی ایران Iranian Journal of Fisheries Sciences
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