ABSTRAKPerairan Teluk Jakarta memiliki potensi perikanan tangkap bagi masyarakat daerah pesisir Jakarta. Berbagai jenis ikan tertangkap pada perairan ini. Ikan petek (Leiognathidae) di Teluk Jakarta merupakan salah satu jenis ikan demersal yang cukup banyak tertangkap. Keragaman jenisnya mencapai setengah dari jenis ikan petek diseluruh Indonesia. Selama penelitian telah ditemukan sebanyak tujuh jenis ikan petek dati tiga jenis genera, yaitu jenis L. splendens, L. equulus, S. ruconius, G. achlamys, L. fasciatus, L. decorus and L. bindus. Penelitian ini ditujukan untuk mengetahui pola pertumbuhan ikan petek di perairan Teluk Jakarta. Model yang digunakan adalah model linear regresi dengan menggunakan metode kemungkinan maksimum. Model ini digunakan untuk mendapatkan estimasi maksimum likelihood (MLEs) parameter pertumbuhan ikan petek. Hasil analisis menunjukkan bahwa tidak terdapat faktor koreksi bias yang diperlukan dalam mendapatkan parameter pertumbuhan ikan. Hasil perhitungan memperlihatkan pola pertumbuhan ikan jenis L. splendens, L. equulus, S. ruconius dan G. achlamys bersifat alometrik negatif, sedangkan jenis ikan L. decorus dan L. fasciatus bersifat alometrik positif. Perkiraan ukuran panjang ikan pertama tertangkap berada dibawah ukuran pertama matang gonad (Lc < Lm), kondisi ini mengindikasikan perikanan mengarah pada growth overfishing. Kata Kunci: Petek; panjang-berat; log-alometrik; koreksi bias; growth overfishing ABSTRACT Pony fish (Leiognathidae) one of dominated catches of fisheries in the Jakarta Bay. There is 7 species of pony fish found in the Jakarta Bay (about an half of total species of pony fishes in Indonesia), namely Leiognathus splendens, L. equulus, S. ruconius, G Achlamys, L. fasciatus, L. decorus and L. Bindus. This reseach aims to examine the growth pattern of pony fishes in Jakarta Bay. Linear regression models used to obtain maximum likelihood estimation (MLEs) fish growth parameters. This model showed that there is no bias correction factor needed in getting the growth parameters. The calculations show that the growth pattern of L. splendens, L. equulus, S. ruconius and G achlamys were negative alometric, while L. fasciatus and L. decorus were positive alometric. It also reveled that the length at first capture was smaller than length at first maturity which indicates growth overfishing of this fisheriesKeywords: Pony fish; length; weight; log-allometric; bias-correction; growth overfishing PENDAHULUAN Perairan Teluk Jakarta memiliki potensi dalam kegiatan perikanan tangkap di daerah Jakarta khususnya aktivitas perikanan yang mendaratkan hasil tangkapannya di Tempat Pelelangan Ikan (TPI) Cilincing. TPI Cilincing merupakan tempat pelelangan ikan yang terletak di Jakarta Utara. Terdapat berbagai jenis ikan yang didaratkan di TPI tersebut. Salah satu jenis ikan yang banyak didaratkan adalah ikan petek. Ikan petek merupakan jenis ikan demersal yang masuk dalam famili Leiognathidae. Penyebaran ikan petek ini sangat luas, yaitu berada di perairan tropis
There is need for a detailed assessment of raw material quality during product development. This study focuses on the performance test of steamer cabinet for fish jelly production. The machine was designed in rectangular shape with 46 cm length, 45 cm width, and 110 cm height, comprising steam generator, burner chamber, wall, tray, and channel. In addition, eight baking sheets were vertically incorporated. Performance test was performed to determine temperature distribution of fish jelly/nugget and individual shelves. This process was conducted with/without load conditions, where parameters, including room cabinet and fish nugget temperatures, as well as fuel usage efficiency, were observed. Furthermore, temperature measurements were also recorded at the top (T1), middle (T2 and T3) and bottom (T4) of the sample device. The results showed the room temperature of each tray was extended to 100 °C under 40 minutes. However, no significant heat change was reported, indicating the steam from the generator was evenly distributed. Furthermore, fish nugget temperature was obtained at 80°C in 40 minutes, where at the top (T1), middle (T2 and T3) and bottom of the steamer cabinet, relatively similar occurrences were observed. The resulting vapour was steadily spread across the steam channel to individual shelves. Therefore, the fuel usage efficiency of the steamer cabinet was estimated at 67 %.
The objective of this study was to investigate effects of Spirulina meal (SM) inclusion in fish feed formulations on their physical and protein content. Four formulations of fish feed were carried out i.e. a control diet with fishmeal (FM) as the single protein source and three others formulations containing Spirulina meal (SM) ingredient in different ratios of FM: SM (w/w) namely 75:25; 50:50 and 25:75 (w/w). All the formulations were processed into pellets using an extruder with a 600 rpm screw speed, 100 °C barrel temperature, and 3 mm diameter of dies. The dried pellets were then evaluated with respect to the protein content and physical properties i.e. expansion ratio, unit density, floatability and hardness. In general, the most optimum pellet formulation was found at the ratio of 25:75 (FM: SM) ingredients resulted in pellet with higher protein (38.89%) and expand ratio (1.65 fold), the lowest unit density (0.473 mg/mm3), the highest floatability (100%) and less hardness (32.53 N). Therefore, formulation of floating fish feed included with Spirulina are an option for improving its protein content and physical properties.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.