Perairan Sei Carang memiliki banyak area lahan terbuka dan bekas pertambangan bauksit di masa lampau. Selain itu, saat terjadi hujan di perairan Sei Carang ditemukan perairan keruh dan air berubah warna menjadi coklat kekuning-kuningan. Oleh karena itu, dilakukan penelitian dengan tujuan mengetahui kondisi lingkungan fisika perairan di perairan Sei Carang dengan parameter uji berupa kekeruhan dan kecepatan arus serta mengetahui karakteristik sedimen di perairan Sei Carang dengan menggunakan metode purposive sampling. Metode purposive sampling tersebut diterapkan pada 4 stasiun penelitian dengan karakteristik stasiun I pada area lahan bekas pertambangan bauksit, stasiun II pada area lahan terbuka, stasiun III pada vegetasi mangrove rusak akibat penebangan, dan stasiun IV pada vegetasi mangrove alami. Karakteristik sedimen pada kolom perairan Sei Carang berupa medium sand, sedangkan pada dasar perairan Sei Carang berupa coarse sand.

Brown strip red snapper or umela fish catched by fisherman in Kelong Village by bottom trap called ‘bubu’ in Mapur Waters. That fish high economic value and exported fish because high fish export market demand, as well as umela fish also made processed by society in Kelong Village such as fillet and increase the price in the market. This study was held in September 2018 until April 2020 in the landing fish Kelong Village. The study aimed at analyzed catch per unit effort (CPUE), maximum sustainable yield (MSY), level and utilization effort, as well as the total allowable catch (TAC) in umela fishing in the Mapur Waters that was landed in Kelong Village. The study used survey method, primary data retrieval is conducted with interviews fisherman directly and secondary data consists of supporting documents and literature. Data analysis was used Schaefer model in this study. The results obtained an average value of CPUE of 1.61 kg/unit, and maximum sustainable yield (MSY) value of 795.50 kg/unit with optimum capture effort (f opt) of 796 units, umela fish has not been said overfishing. The utilization rate of umela fish is 60% and categorized as medium, it is still possible to maximize utilization up to 80% followed by government controlled.  As well as the total allowable catch (TAC) of 636.4 kg/unit, umela fishing could be upgraded but cannot exceed the conditions.

Red crab (Thalamita spinimana) is a type of crab that has a light body color, favored by coastal communities for its thick meat and high protein content at a low selling price. This research purpose to determine the maturity level of female red crabs. This research was conducted using a survey method with sampling twice for two months which was carried out from April to May 2021 in Dompak Waters, Tanjungpinang. The results of the research found that TKG I was immature gonads. Female red crabs incubate eggs (Ovigerous) with yellow and orange color, dominated by immature gonads, while brown and dark gray colors are dominated by mature gonads.

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