Predicting Impacts of Offshore Monoculture Farm Expansion in Ultra-Oligotrophic Waters of the Levantine Basin.

Livne, Leigh, Grossowicz, Michal, Tchernov, Dan and Ayalon, Ofira (2020) Predicting Impacts of Offshore Monoculture Farm Expansion in Ultra-Oligotrophic Waters of the Levantine Basin. Open Access Frontiers in Marine Science, 7 . Art.Nr. 556. DOI 10.3389/fmars.2020.00556.

[thumbnail of fmars-07-00556.pdf]
Preview
Text
fmars-07-00556.pdf - Published Version
Available under License Creative Commons: Attribution 4.0.

Download (2MB) | Preview
[thumbnail of Data Sheet] Other (Data Sheet)
Data_Sheet_1_Predicting Impacts of Offshore Monoculture Farm Expansion in Ultra-Oligotrophic Waters of the Levantine Basin.DOCX - Supplemental Material
Available under License Creative Commons: Attribution 4.0.

Download (95kB)

Supplementary data:

Abstract

The aim of this brief research report was to define the consequential shifts in biomass and trophic structure of an ecosystem surrounding an offshore monoculture fish farm in Israel. It attempts to clarify the impact of the industry expansion and input of artificial fish pellets on functional group biomasses. We account for the direct addition of artificial food pellets, the metabolic wastes from the caged fish in a mass-balance food web model (Ecopath), as well as the temporal expansion of the farm’s production capacity to 21,000 t over a 30-year period (Ecosim). In the static mass-balance model of the food web, the addition of the fish cages at its current production size of 1000 t does not adversely affect the system, and trophic energy transfer is still dependent on primary production versus the detrital pathway. The model suggests a semi-stable ecosystem with low trophic interactions. With time, the increase in fish farming at the site is characterized by an increase of all functional group biomasses at the site over the 30-year period. The accumulation in detritus most notably correlates to greater biomass for all benthic functional niches and their secondary consumers. It is, therefore, apt to develop an indicator species list to indicate negative site disturbance. In summary, the sediment column condition will be the main indicator for ecosystem stability, as well as the increase in apex predators that are attracted to the site from the accumulation of discards at the cage bottom

Document Type: Article
Keywords: biomass; Ecopath mass-balance; Ecosim; fish farm; Mediterranean Sea – eastern; modeling; oligotrophic
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.3389/fmars.2020.00556
ISSN: 2296-7745
Date Deposited: 17 Aug 2020 12:51
Last Modified: 08 Feb 2021 07:27
URI: https://eprints-training.geomar.de/id/eprint/50339

Actions (login required)

View Item View Item