Seaweed is a promising fishery product. Potential aquaculture of which in Lampung Province is estimated around 2260.5 ha. Several seaweed farming efforts have been carried out in Lampung Bay (Indonesia). However, they faced failure. Therefore, it is necessary to carry out spatial analysis to understand the level of seaweed farming suitability in the bay. This study was carried out in five observation site groups with total 20 sampling points and employed survey through spatial and temporal approaches as the study method. Geo-statistical model was used for earth surface mapping, both for biotic and abiotic components. Each station was then be given value to determine suitability class. The class was determined by making aquatic suitability matrix for each physical, chemical and biological parameter. Results acquired indicate that Lampung Bay area is not suitable as seaweed farming site. However the area is open for any suggestion.

The addition of Bacillus polymyxa bacteria in the feed as immunostimulant is one of the efforts of disease prevention on vannamei shrimp (Litopenaeus vannamei). The aimed of this research was to know the effectivity of the use of Bacillus polymyxa bacteria in feed towards the non-specific imunity of vannamei shrimp. This research consisted of 4 treatments namely feed with the density of Bacillus polymyxa bacteria 0 cell/ml as control (A), 104 cell/ml (B), 106 cell/ml (C) and 108 cell/ml (D) and each treatment is repeated 3 times. This research has been done in 15 days. Parameters that observed this research were total haemocyte count (THC), phagocytosis activity, differential haemocyte count (DHC) and water quality. The results showed that the addition Bacillus polymyxa bacteria of 106 cell/ml was able to improve THC value 6,6x107 cell/ml on the day 10. The DHC value was in the normal range which is hyalin cell was 52-89% and granular cell was 11-48%. The quality of water maintenance media during this research was in the normal range there were temperature 27,2-28,1°C, DO 3,70-3,91ppm, pH 3,70-3,91, and salinity 30-35 ppt.

One effort made to improve the color quality of comet fish is to add canthaxanthin. Canthaxanthin is a red-orange pigment found in plants, fungi, bacteria, crustaceans, sea trout, and algae. This study aims to determine the optimum dose of canthaxanthin given in feed to improve comet fish' color quality. This research is also expected to be beneficial for fish farmers related to the use of canthaxanthin to improve comet fish' color quality. This study used 5 treatments with 3 replications. This research was conducted in April-June 2019 at the Aquaculture Laboratory, Department of Fisheries and Marines, University of Lampung. The parameters observed were color measurement using the Red Blue Green (RGB) method, converted into the Hue Saturation Brightness (HSB) value, color measurement by the scoring method, and water quality. The addition of canthaxanthin in diets with different doses showed the highest results in treatment C (P <0.05) on comet fish visual appearance. The results showed that the best dose in this study was the addition of canthaxanthin as much as 125 mg/kg of feed.

Tilapia (Oreochromis niloticus) is a freshwater fish commodity that has high economic value, is widely cultivated and has high demand. However, the obstacle that is often experienced by farmers is the high price of feed caused by the high price of imported feed raw materials. Overcoming this can be done by looking for alternative raw materials that can replace soybean meal flour such as fermented lemna flour. This research was conducted to study the growth performance of tilapia fed a test feed using fermented lemna flour (Lemna sp.) substitution. The total treatment used was 5 treatments and 3 replications, with a completely randomized design (CRD). Treatment A (0% TLF), B (25% TLF), C (50% TLF), D (75% TLF), and treatment E (100% TLF). Parameters observed were absolute weight gain, daily growth rate, protein retention, feed conversion, protein efficiency ratio, survival rate, and water quality. The results showed that treatment B (25% TLF) gave the best results compared to other treatments, where the absolute weight growth rate reached 7.11 g, the daily growth rate (SGR) was 3.39%, feed conversion (FCR) was 2.22 and protein retention 36.08%.

Spiny lobster (Panulirus penicillatus) is one of luxury seafood product that cultured in floating cage. There is no information about feeding rate of this species in particular feed with fresh mangrove snail meat. This study aimed to optimized level of feeding rate in spiny lobster during limited periods of cultured. Feeding rate of 10, 20 and 30% were used as treatments. Three floating cages with 120 individuals of pre-adult of spiny lobster was used. Sixty days of cultured periods with absolute growth, specific growth rate and survival rate were analysed to determined optimized growth rate. Results showed that 10% of feeding rate was supported highest absolute growth and specific growth rate compared to 20% and 30 % feeding rate. Moreover, all level of feeding rate can support 100 % of survival rate.  This study recommends feeding rate 10% is sufficient feed percentage per day that able to support culture performance of spiny lobster grow-out in floating cage.