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An Exploratory Ecosystem Model of the Bay of Bengal Large Marine Ecosystem

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An Exploratory Ecosystem Model of the Bay of Bengal Large Marine Ecosystem An exploratory ecosystem model of the Bay of Bengal Large Marine Ecosystem Sylvie Guénette EcOceans, St. Andrews NB, Canada prepared for the Bay of Bengal Large Marine Ecosystem Project ( www.boblme.org/ ) December 2013 (revised 27 August 2014) S. Guénette, 2013 Bay of Bengal model 2 S. Guénette, 2013 Bay of Bengal model 3 Abstract The trend towards ecosystem-based management requires the development of tools to gain insights in ecosystem functioning and the impact of fishing on ecosystem structure. This study aims at developing one of such tools, an ecosystem model of the Bay of Bengal built with the Ecopath and Ecosim software. The Bay was divided in three sections considered relatively independent from each other while migrating species were assumed to occupy the entire study area. The available data and the methods to develop the model are described. The static model (Ecopath) was built to represent year 1978 and synthesise available population dynamics and fisheries data. A preliminary Ecosim model was set up to allow exploring interactions between functional groups and the impact of fishing. Time series of abundance, catches and effort were assembled for four functional groups for this purpose. The Ecopath model is one image of the ecosystem that results from the data available and the choices that were made for each parameter at the input, stage and when balancing the model. Several crucial gaps in biomass estimates and level of exploitation were noted. Changing the assumptions would lead to different biomasses and P/B values and possibly, the strength of the foodweb links. Given the lack of time series to fit the model to a larger number of functional groups, and the use of commercial CPUEs as abundance indices for large pelagics, the uncertainty of temporal simulations is large. As it stands, the model is a great framework to articulate data, improve research questions, and determine what important piece of information would be useful to gather to answer the most crucial questions. It can be modified and expanded as data become available. The results from temporal simulations should not be used to give quantitative management advice. Instead, current Ecosim simulations could be used as a tool to explore food web dynamics and effects of fishing. S. Guénette, 2013 Bay of Bengal model 4 Table of contents Abstract ......................................................................................................................................................................... 3 Introduction ................................................................................................................................................................... 6 Methods ........................................................................................................................................................................ 6 Ecopath with Ecosim ................................................................................................................................................. 6 Study area and model structure ................................................................................................................................ 7 Catch, effort and CPUE .............................................................................................................................................. 9 Catch ..................................................................................................................................................................... 9 Effort ..................................................................................................................................................................... 9 CPUE and fleet .................................................................................................................................................... 10 Large pelagics effort and CPUE time series (contributed by Rishi Sharma, IOTC) .............................................. 10 Fish .......................................................................................................................................................................... 11 Diets .................................................................................................................................................................... 11 Fish surveys ......................................................................................................................................................... 11 Natural mortality ................................................................................................................................................ 12 P/B and P/Q ........................................................................................................................................................ 13 Sharks and rays ................................................................................................................................................... 13 Tuna-like and scombrids ..................................................................................................................................... 14 Bathypelagic species ........................................................................................................................................... 15 Large piscivores (Lpisc) ....................................................................................................................................... 15 Carangids ............................................................................................................................................................ 15 Small pelagics (Spel) ............................................................................................................................................ 15 Large piscivores of commercial interest (Lpisc comm) ....................................................................................... 16 Other coastal fishes ............................................................................................................................................ 17 Hilsa .................................................................................................................................................................... 17 Indian mackerel .................................................................................................................................................. 19 Benthic invertebrates .............................................................................................................................................. 19 Jellyfish .................................................................................................................................................................... 19 Cephalopods ............................................................................................................................................................ 20 Zooplankton ............................................................................................................................................................ 20 Primary producers ................................................................................................................................................... 20 Birds and mammals ................................................................................................................................................. 21 Detritus .................................................................................................................................................................... 21 Balancing the model .................................................................................................................................................... 21 Uncertainty and pedigree ............................................................................................................................................ 28 Ecosim model .............................................................................................................................................................. 30 Acknowledgements ..................................................................................................................................................... 34 References ................................................................................................................................................................... 34 Appendices .................................................................................................................................................................. 39 A1 Functional groups ............................................................................................................................................... 39 A1.1 Allocation of catch species to functional groups . ....................................................................................... 39 A1.2 Area considered for each functional group. ............................................................................................... 44 A1.3 Functional groups composition .................................................................................................................. 45 A2 Catch, effort and CPUEs ..................................................................................................................................... 48 A2.1 Total catch (t/km2/year) per fleet and functional
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