Pakan merupakan salah satu komponen penting yang menentukan keberhasilan akuakultur, terutama sebagai penyedia energi dalam metabolisme ikan. Namun, hingga saat ini pakan menyita 60-70% dari keseluruhan total biaya produksi, terutama sistem budidaya intensif sehingga perlu dilakukan formulasi pakan menggunakan bahan baku lokal sebagai alternatif yang memiliki kandungan nutrisi tinggi dan harga lebih terjangkau dari pakan komersial. Penelitian menggunakan tepung tulang ikan sebagai bahan utama, dengan penambahan tepung lainnya dan terbagi menjadi 4 perlakuan (P1, P2, P3 dan P4) dengan penambahan pakan pabrik sebagai kontrol. Hasil penelitian menunjukkan bahwa pakan dengan perlakuan P4 memiliki karakteristik fisis dan kimiawi terbaik, dengan daya rekat, daya apung dan daya tahan dalam air yang menyerupai ketahanan pakan pabrik. Keseluruhan perlakuan pakan memiliki total energi lebih dari 1 kkal / gram dengan konversi harga lebih murah >10% dibandingkan pakan buatan pabrik, sehingga dapat disimpulkan bahwa formulasi pakan lokal hasil penelitian ini dapat digunakan sebagai alternatif pakan buatan komersial.

Ngipik, bunder and dowo reservoirs or dowo are one of the repositories in Gresik regency located in the center of the city that has been utilized by the community for industrial, agricultural and domestic purposes, while also being used for tourism purposes. The study aims to determine water quality and evaluate the status of water fertility in three reservoirs/lakes (Ngipik, Bunder and Dowo) in Gresik district. The research activities were carried out from 16 to 20 July 2019. The data collection method used a survey method with stratified random sampling at three different stations. The results of water quality measurements show that overall that the water quality in the three reservoirs/ponds is still good for aquaculture activities except Ngipik Lake based on phosphate values of 0.75 - 3 ppm can be categorize including the status of dense eutrophic waters so specific management plans are needed to optimize its utilization. Whereas in the Bunder reservoir and Dowo ponds, the phosphate content has not detected, so its water status is oligotrophic.

The application of polyculture cultivation techniques is expected to increase the carrying capacity of farmland in certain circumstances, where production growth will remain stable. In this study, to be cultivated with a polyculture system are bandeng (C. chanos), shrimp vaname (L. vannamei), and seaweed G. verucossa. The increase in productivity of ponds (optimization) can be seen by the increase in fish production related to solid spread in cultivation media. The priority of this study is to examine the difference in density of bandeng, shrimp and  seaweed in the polyculture system. The design in this study is to use complete randomized design (RAL) with 3 treatments, each treatment has 3 replays so there are 9 experimental units. The variables observed are absolute weight and Specific Growth Rate (SGR). The results of this study show that the determination of the composition of different organisms in the polyculture system gives a real influence on absolute weight and SGR with the best treatment for absolute weight is treatment A (density of shrimp and bandeng 10 tails/m2, 250 g/m2 seaweed) is 40.73 g, and the best treatment for SGR is treatment A (shrimp density and bandeng 10 tails/m2, seaweed 250 g/m2) of 1.15 %BB/Day.

Anisakiasis is a human disease caused by infection of Anisakid (nematodes) from the Anisakidae family (genus: Anisakis, Pseudoterranova, and Contracaecum). Anisakid requires several hosts to complete its life cycle: paratenic host (crustacea, cephalopods, shellfish), intermediate host (fish) and a final host (marine mammals). However, humans can be infected by Anisakid by consuming the raw or undercooked host carrying the parasite. The aim of this study is to identify Anisakid in two species of marine fish; red snapper (Lutjanus malabaricus) and grouper (Epinephelus sexfasciatus) obtained from Gresik traditional markets. Anisakid identification was performed by characterization of morphological features using light microscopy. As the results, we found red snapper and grouper fish were infected by the larvae (L3) of Anisakis Type II with infection intensity and prevalence of 3.17 parasites/fish and 60%, 12.75 parasites/fish and 80%, respectively. This finding confirms the presence of Anisakid in fish for human consumption in the Gresik region and justifies further investigation.

Feed is an important thing for fish cultivators, apart from the nutritional content of the feed it is also seen in terms of price and availability. When fish are cultivated, feed becomes a limiting factor for production. Likewise with fish maintenance, it requires the availability of feed that is suitable in terms of size, nutrition, and quantity. The purpose of this study was to determine the levels of protein, fat, and water content in the freshwater snails (Filopaludina javanica) in the waters of the Waung River. In this study, it was taken from the Waung river which is located in Glagah District, Lamongan Regency, because the river is filled with freshwater snails. This research has 2 stages, namely descriptive and experimental research with sampling at 3 points waung river station. Snail samples were taken in living conditions and brought to the Laboratory of the Department of Marine Affairs and Fisheries, UPT, quality testing and development of marine and fishery products in Surabaya for laboratory tests. The conclusion that can be drawn from this research is that the freshwater snails in the Waung River, Glagah District, have the highest protein at station 2 in the middle of the river at 16.20%. The highest fat content was also obtained at station 2 in the middle of the river at 3.39%, while the highest water content was obtained at station 3 at the downstream of the river at 78.99%.