Fishing nets. Method of test for the determination of mesh size

2003 ◽  
Keyword(s):  
Mesh Size

scholarly journals KAPASITAS ADSORPSI SERBUK NATA DE COCO (BACTERIAL SELLULOSE) TERHADAP ION Pb2+ MENGGUNAKAN METODE BATCH

Jurnal Kimia ◽  
2020 ◽  
pp. 71
Author(s):  
C. A. Saputri
Keyword(s):  
Adsorption Capacity ◽  
Mesh Size ◽  
Atomic Absorption Spectrophotometry ◽  
Isotherm Models ◽  
Batch Method ◽  
Optimum Time ◽  
Absorption Spectrophotometry ◽  
Pattern Approach ◽  
Size Characterization

The purpose of this research is determine adsorption capacity of nata de coco powder to the ion Pb2+. Nata de coco is a cellulose derived from the fermentation of Acetobacter xylinum bacteria. Nata de coco powder is made by  mashed nata de coco then heated at 80oC,  mashed and sifted up to 30-40 mesh size. Characterization includes  determination of  moisture content, ash content, density and amount of iodine adsorbed. Optimum contact time using batch method with time variation are 20, 40, and 60 minutes. The determination of the capacity of adsorption using the isotherm pattern of Langmuir and Freundlich using variation  concentrations Pb2+ 15, 30, 45, and 60 ppm. Amount of adsorbed ion Pb2+ measured by using the Atomic Absorption Spectrophotometry (AAS) at a maximum wavelength of  Pb2+ that is 283 nm. The results showed that the optimum time was reached at 60 minutes. Adsorption pattern  approach to the Freundlich’s Isotherm models with an adsorption capacity  2.34 mg/g.   Keywords: adsorption capacity, Freundlich’s isotherm, ion Pb2+, nata de coco powder

scholarly journals Pengaruh Perbedaan Kedalaman Terhadap Fitoplankton dan Zooplankton Di Perairan Pulau Panjang, Jepara

2019 ◽  
Vol 8 (2) ◽  
pp. 181-188
Author(s):  
Deftika Mulyawati ◽  
Raden Ario ◽  
Ita Riniatsih
Keyword(s):  
Sea Level ◽  
Sea Water ◽  
Mesh Size ◽  
Active Method ◽  
Limited Mobility ◽  
Relationship Of ◽  
The Relationship ◽  
Ship Speed

Plankton merupakan sebuah kelompok organisme yang hanyut bebas di dalam lautan. Plankton dapat dibagi menjadi dua golongan, yaitu fitoplankton dan zooplankton. Penelitian ini bertujuan untuk mengetahui hubungan dari kelimpahan fitoplankton dan zooplankton berdasarkan perbedaan kedalaman di perairan timur Pulau Panjang Kabupaten Jepara. Pengambilan sampel dilakukan dengan metode aktif yaitu dengan menarik plankton net dengan mata jaring ukuran 45µ untuk fitoplankton dan 150µ untuk zooplankton. Penarikan dilakukan menggunakan kapal selama 3-5 menit dengan kecepatan kapal 0,67 m/s pada lokasi penelitian. Penentuan stasiun penelitian berdasarkan pada perbedaan kedalaman. Kedalaman air laut yang digunakan pada saat pengambilan sampel ini adalah stasiun 1 dengan kedalaman 0 m atau permukaan air laut, stasiun 2 dengan kedalaman 1-2 m dari permukaan air laut, dan stasiun 3 dengan kedalaman 3-4 m dari permukaan air laut. Pengukuran kualitas perairan dilakukan secara in situ bersamaan dengan pengambilan sampel dilakukan. Hasil dari penelitian ini didapatkan komposisi fitoplankton sebanyak 13 genus dengan kelimpahan berkisar antara 3844,19-10869,80 individu/m3. Komposisi zooplankton di perairan didapatkan sebanyak 12 genus dengan kelimpahan berkisar antara 838,77-3250,24 individu/m3. Hubungan kelimpahan antara zooplankton dan fitoplankton di perairan ini termasuk kedalam golongan hubungan korelasi positif Plankton is a group that drifts freely in the ocean. Plankton has limited mobility. Plankton can be divided into two groups, namely phytoplankton and zooplankton. This study aims to determine the relationship of the abundance of phytoplankton and zooplankton based on rates in the east of Panjang Island, Jepara Regency. Sampling is done by the active method, namely by pulling the plankton net with a mesh size of 45µ for phytoplankton and 150µ for zooplankton. Withdrawals carried out by a ship for 3-5 minutes with a ship speed of 0.67 m/s at the study site. Determination of research stations based on differences in depth. The depth of sea water used during sampling is station 1 with a depth of 0 m or sea level, station 2 with a depth of 1-2 m from sea level, and station 3 with a depth of 3-4 m above sea level. Measurements of water quality were carried out in situ together with sampling. The results of this study obtained phytoplankton compositions as many as 13 genera with abundance ranging from 3844.19-10869.80 individuals/m3. The composition of zooplankton in the waters obtained as many as 12 genera with abundance ranging from 838.77-3250.24 individuals/m3. The relationship of abundance between zooplankton and phytoplankton in these waters is included in the group of positive correlation.

scholarly journals Determination of gill-net selectivity for King Fish (Scomberomorus Commerson, Lacepede 1800) using Mesh size in Sungailiat, Bangka Belitung Province

2021 ◽  
Vol 16 (4) ◽  
Author(s):  
Pareng Rengi ◽  
Polaris Nasution ◽  
Arthur Brown ◽  
Ayu Nita Ervina Tambunan
Keyword(s):  
Standard Deviation ◽  
Population Distribution ◽  
Fork Length ◽  
Mesh Size ◽  
Fishing Gear ◽  
Gill Net ◽  
Scomberomorus Commerson ◽  
L Value

Selectivity is a fishing gear characteristic capable of catching fish of a specific size and species from the existing population distribution. Mesh size is one of the important factors that influence gillnets’ selectivity, because different length-classes of fish are caught by them. This report focuses on the selectivity of two mesh sizes of gillnets (8.89 cm and 10.16 cm) on mackerel's catch and constructing a gillnet in Sungailiat waters. Experimental fishing methods and selectivity analysis were used for the fishing gear’s more selective preparation, if the largest fishing ratio's value at the fork length (L) is high and the standard deviation value (S) is closer to 1. It is concluded that to be more selective a largest S (L) value of 0.999267194 at fork length (L=54.95 cm), and with a larger value of S (L) 0.997096071 and with (L=66.55 cm) for mesh Sizes 8.89 cm and 10.16 cm, respectively.

scholarly journals Abundance and spatial-temporal distribution of the shrimp Xiphopenaeus kroyeri (Decapoda: Penaeidae): an exploited species in southeast Brazil

2016 ◽  
Vol 76 (3) ◽  
pp. 764-773
Author(s):  
E. R. Silva ◽  
G. S. Sancinetti ◽  
A. Fransozo ◽  
A. Azevedo ◽  
R. C. Costa
Keyword(s):  
Species Abundance ◽  
Organic Matter Content ◽  
Coastal Region ◽  
Temporal Distribution ◽  
Mesh Size ◽  
Matter Content ◽  
Southeastern Brazil ◽  
Otter Trawl ◽  
Xiphopenaeus Kroyeri

Abstract This study evaluated the abundance and spatial-temporal distribution of the shrimp Xiphopenaeus kroyeri in the coastal region of Macaé, state of Rio de Janeiro, southeastern Brazil. Monthly samples were obtained from March 2008 to February 2010 in six stations located in Inner (5, 10 and 15m depth) and Outer (25, 35 and 45m depth) areas. It was used a commercial fishery boat equipped with an otter-trawl net (3.5 m mouth width, mesh size 20mm and 15mm in the cod end). Water samples were taken for determination of temperature and salinity, and sediment samples for determination of texture and organic matter content. A total of 7146 shrimps were sampled. About 95% of all shrimps were caught in the shallow area, i.e., depths <20m. Greatest abundances were recorded in winter and spring. No significant correlation was observed between sediment (phi) and abundance. The distribution of X. kroyeri in the studied area was closely related to seasonal cold waterfront of the South Atlantic Central Water (SACW) and temperature was the main factor affecting the species abundance.

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