Biomonitoring Application at IMTA Cage at Two Different Farming Areas: An Effort Towards Productive Sustainable Aquaculture
Abstract
The evaluation of the application of the Integrated Multi-Trophic Aquaculture (IMTA) system is needed due to potential environmental disturbance caused by organic enrichment. The aim of this study is to assess the potential environmental disturbance by applying biomonitoring, measuring the relationship between macrobenthic structure and organic matter in farmed zones in Karimunjawa and Teluk Awur, Jepara, Indonesia. The study was conducted at two coastal areas: Teluk Awur (Station 1: MSTP Area; Station 2: Coast of Panjang Island) and Karimunjawa (Station 1: Monoculture Zone; Station 2: Polyculture Zone). Sediment sample analysis at Teluk Awur stations revealed an average organic carbon (C-organic) content of 3.3 mg C gdw-1 and an average total nitrogen (N-total) content of 0.7 mg N gdw-1, whilst those at Karimunjawa had an average of 5.0 mg C gdw-1 and 0.8 mg N gdw-1, respectively. The total abundance of macrobenthic communities from Karimunjawa (55,812 ind m-2) was higher than in Teluk Awur coastal area (48,676 ind m-2), implying a better sediment property for the microbenthic habitat. Dominant species in Teluk Awur were Peronidia sp. (3655 ind m-2), Divalucina sp. (2709 ind m-2), and Turritella sp. (3913 ind m-2), whilst in Karimunjawa they were Fustiaria sp. (3569 ind m-2), Bittium sp. (4687 ind m-2), Rissoina sp. (5029 ind m-2), and Cerithium sp. (3784 ind m-2). The most influential abiotic factor affecting macrobenthic structure was N-total (BIO-ENV, Primer 6.1.5; r = 0.117). Anthropogenic activities such as fishing and tourism are suspected to influence changes in organic chemical compounds.
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