scholarly journals Exploitation status of Lobster on Kebumen Waters

2011 ◽  
Vol 4 (2) ◽  
pp. 10-15
Author(s):  
Suradi Wijaya Saputra
Keyword(s):  
Carapace Length ◽  
Survey Methods ◽  
Fishing Season ◽  
Central Java ◽  
Exploitation Status ◽  
Objective Research

The research of the exploitasion status of Lobster (Panullirus sp) was held on Kebumen waters Central Java. The objective research were to analysis of exploitation level and fishing season.of lobster. Samples was collected from August to September 2008, using survey methods. The study area were three TPI : TPI Pasir, TPI Argopeni and TPI Karangduwur. The results showed that Lobster caught occurred through the year, with fishing season from November to February, and peak season on December. Base on carapace length and weigh of Lobster, show that level of exploitation was indicated over-exploitation.Key word : Lobster, exploitation status, Kebumen waters

PENGEMBANGAN TANAMAN RAMI (Boehmeria nivea L. Gaud) DAN PEMANFAATAN LIMBAH DAUN RAMI UNTUK PENGGEMUKKAN DOMBA WONOSOBO

2018 ◽  
Vol 16 (2) ◽  
pp. 201-210
Author(s):  
Muryanto Muryanto ◽  
Pita Sudrajad ◽  
Amrih Prasetyo
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Plant Development ◽  
Body Weight Gain ◽  
Survey Methods ◽  
The Body ◽  
Boehmeria Nivea ◽  
Central Java ◽  
Potential Capacity ◽  
The Given

The aim of the study was to determine the development of ramie plants (Boehmeria nivea L. Gaud) and the effect of using ramie leaves on feed on the body weight gain of Wonosobo Sheep (Dombos). Research on the development of ramie plants using survey methods in the area of ramie plant development in Wonosobo Regency. While the research on the use of ramie leaves for fattening was carried out in Butuh Village, Kalikajar District, Wonosobo Regency in 2018. 21 male Dombos were divided into 3 feed treatments with forage proportions of 70%, 50% and 30 ramie leaves respectively. %. The results showed that currently ramie plants were being developed in Wonosobo Regency by CV. Ramindo Berkah Persada Sejahtera in Gandok Village, Kalikajar District, Wonosobo Regency, Central Java. Until now the area of the crop has reached 13 ha. Of this area will produce ramie leaves 195,000 kg / year. If one sheep needs 4 kg of ramie / tail / day leaves, then the potential capacity of sheep is 135 heads / year, if the given one is 50% then the Jurnal Litbang Provinsi Jawa Tengah, Volume 16 202 Nomor 2 – Desember 2018potential capacity is 270 heads / year and if it is reduced again to 25% of ramie leaves then the potential capacity 440 heads / year. The use of ramie leaves as a feed for Wonosobo Sheep fattening can be given as much as 30% in fresh form.

Laboratory and Field Tests of Modified Sphyrion Tags on Lobsters (Homarus americanus)

1970 ◽  
Vol 27 (2) ◽  
pp. 257-264 ◽  
Author(s):  
D. J. Scarratt
Keyword(s):  
Carapace Length ◽  
Field Tests ◽  
Homarus Americanus ◽  
Poor Survival ◽  
Internal Organs ◽  
Fishing Season ◽  
Tag Loss

Mortalities of lobsters held in the laboratory and tagged with sphyrion tags inserted dorsally between the carapace and abdomen (subcarapace tag) and between the second and third abdominal segments (abdomen tag) did not differ significantly. Premoult tag loss was negligible. The subcarapace tag was retained significantly better through moulting.Returns of subcarapace-tagged and abdomen-tagged lobsters released on the fishing grounds in June, 11 weeks before the August 10 opening of the fishing season, were lower than returns of carapace-tagged lobsters released in early August. More subcarapace-tagged than abdomen-tagged lobsters were returned, and a higher proportion had moulted. Growth was comparable to that reported in the literature. Few lobsters were recaptured during the following fishing season, 14–16 months after liberation, and none subsequently. Returns from lobsters less than 63.5 mm carapace length (sublegal) when tagged were extremely low. Poor survival may be related in part to time of release. Some injury to internal organs may occur with both tags. The subcarapace tag is clearly superior but may be of limited value in the field for lobsters below 63.5 mm carapace length.

Biological tags as moult indicators in Panulirus cygnus (George)

1997 ◽  
Vol 48 (8) ◽  
pp. 959 ◽  
Author(s):  
R. Melville-Smith ◽  
J. B. Jones ◽  
R. S. Brown
Keyword(s):  
Carapace Length ◽  
Size Range ◽  
Field Trials ◽  
Size Category ◽  
Fishing Season ◽  
Panulirus Cygnus ◽  
Biological Tags

Laboratory and field trials were employed to examine the feasibility of using biological tags as moult indicators. Twenty-four animals were tagged with epidermal implants and held in aquaria for 2 years and 8 months before the tags were removed. Five tags failed to form useful cysts and one tag was damaged during processing. The remaining 18 lobsters moulted between three and six times, with this moulting record being accurately verified by 15 of the biological tags and incorrectly interpreted (by one moult) in one case. Two tags produced inconclusive results. Biological tags were tested in the field in the Fremantle area, with 132 animals being recaptured out of 1336 tagged. Eleven tags proved impossible to read, eight failed to form cysts, and the balance recorded up to six moults during the release period. Animals in the size range 60–80 mm carapace length (CL) recorded two moults per year, one in February–April and a second before the mid-November start to the fishing season. Females grew significantly less per moult than did males in the same size category (60–85 mm CL), and both sexes showed significantly smaller increments for animals ≥85 mm CL at release.

scholarly journals Growth parameter, mortality, recruitment pattern, and exploitation rate of white shrimp Penaeus indicus in northern coastal waters of Western Central Java, Indonesia

2019 ◽  
Vol 20 (5) ◽  
Author(s):  
SURADI WIJAYA SAPUTRA ◽  
ANHAR SOLICHIN ◽  
WIWIET TEGUH TAUFANI ◽  
SITI RUDIYANTI ◽  
NINIEK WIDYORINI
Keyword(s):  
Carapace Length ◽  
Growth Parameters ◽  
Growth Parameter ◽  
White Shrimp ◽  
Survey Method ◽  
Northern Coast ◽  
Recruitment Pattern ◽  
Central Java ◽  
Exploitation Rate ◽  
Penaeus Indicus

Abstract. Saputra SW, Solichin A, Taufani WT, Rudiyanti S, Widyorini N. 2019. Growth parameter, mortality, recruitment pattern, and exploitation rate of white shrimp Penaeus indicus on the northern coast of Central Java, Indonesia. Biodiversitas 20: 1318-1324. The aims of this study were to know the growth parameters, first lenght captured (Lc), mortality, recruitment pattern, and the exploitation rate of white shrimp (Penaeus indicus H.Milne Edwards, 1837) in the Western Coastal North Central Java Sea, Indonesia. Samples were collected from May 2016 to July 2017 using survey method and direct observations on fishing unit areas. The results showed that the relationship of the carapace length and weight is allometric. Based on the estimates of von Bertalanffy growth equation to the carapace length, the growth parameters of CL∞ and K values in male were 37 mm and 0.97, while in female were 38.5 mm and 0.85. While, the rates of total mortality (Z), natural mortality (M), and fishing mortality (F) were 3.5, 1.67, and 1.84 for males, and 5.03, 1.51, and 3.52 for females, respectively. The exploitation rate (E) of male shrimp was 0.52 and of female was 0.7 indicating that female shrimp get higher capture pressure than the males. It also showed that the rate of exploitation has to exceed the optimum sustainable yield (E>0.5). Time recruitment occurred throughout the year, with two peak seasons, i.e., in April-June and September-November. Moreover, the length of the carapace during recruitment was 15-20 mm. While the carapace length of the first caught (CL∞50) was 18.3 mm for male and 17.6 mm for female indicating that the P. indicus caught was still in the small size, as well as below the first mature gonad (CLm50 = 22-39 mm). This is because the mesh size of cod-end is 0.75 inches or about 2 cm.

scholarly journals Farmer Perceptions and Preferences to Shallot Farming Technology Introduction in Grobogan District, Central Java, Indonesia

2021 ◽  
Vol 232 ◽  
pp. 01002
Author(s):  
Dewi Sahara ◽  
Aryana Citra Kusumasari ◽  
Agus Hermawan
Keyword(s):  
Financial Analysis ◽  
Survey Methods ◽  
Farmer Perceptions ◽  
Central Java ◽  
Planting Material ◽  
Technology Introduction ◽  
The Government ◽  
High Level ◽  
The Cost

Farmers commonly use seed bulbs in shallot farming. Therefore it is required to conduct a demonstration plot to promote the technology of true shallot sheet (TSS). The study aims to determine the performance of the newly seedling technique and determine the perceptions and preferences of farmers towards shallot farming, in Padang Village, Tanggungharjo Sub- District, Grobogan District, in September - November 2018. The study used a demonstration plot of shallot farming using seedling and survey methods to the 30 shallots farmers. Financial analysis (BCR and MBCR) was used to determine the performance of shallot farming, while farmers' perceptions and preferences were analyzed descriptively with scoring techniques. The results showed that even though the cost of shallot farming using seedling was higher, it resulted in higher production (BCR 2.76 vs 0.25). The TSS using as planting material against bulbs was also beneficial since the MBCR value was 5.64, implying that the seedling technique was more profitable than seed bulbs using. With these significant results, farmers stated a high perception of shallot farming using seedling, indicated a high level of preference, which is 73.33 - 93.33%. Based on these results, the government should widely disseminate the TSS to shallot farmers.

scholarly journals Analisis Manajemen Keuangan pada Usaha Peternakan Kemitraan Ayam Broiler Skala Rakyat

2020 ◽  
Vol 5 (1) ◽  
pp. 37
Author(s):  
Taufan Daniarta Sukarno
Keyword(s):  
Large Scale ◽  
Survey Methods ◽  
Cash Flows ◽  
Small Scale ◽  
Central Java ◽  
Operating Cash Flows ◽  
Net Revenue ◽  
Operating Cash Flow ◽  
Plasma Core ◽  
The Cost

Poultry sectors contributed 2,51% of GDRP in the Central Java Province, where Semarangcontributed 1.135.487 kg of Broilers chicken in 2016. Plasma-core partnership is one of the most used business cooperation types amongst the poultry farmers. Classification in poultry business scale divides into 3 classes, which were: Small Scale (≤5.000 heads), Medium Scale (5.001-10.000 heads) and Large Scale (>10.000 head). The purpose of this study is to estimate the operating cashflows and revenue. The benefit of this study is to detect the profits and anticipate losses in poultry farming. This study used Survey methods, location arrangement used purposive sampling and data collected by interviews with the owners. Data analysis used revenue and operating cash flow computation. The results of this study show the net revenue of this poultry farm is IDR.171.488.834, while the operating cash flows are IDR.170.286.117,65. The cost of chicken seedlings purchase and its feed is the most expensive amongst all subjects. Clustering results shows that this poultry was categorized as Small scale poultry, where it’s population is only 4.000 chickens, but are profitable and worthy to expand, and makes it one of the most longest-living poultry farms in the region

scholarly journals Identifikasi Dan Prevalensi Cacing Pada Saluran Pencernaan Ikan Gurami (Osphronemus gouramy) Di Desa Ngrajek Magelang Jawa Tengah [Identification And Prevalence Of Worms On Gouramy Gastrointestinal (Osphronemus gouramy) In Ngrajek Village Magelang Central Java]

2019 ◽  
Vol 5 (1) ◽  
pp. 43
Author(s):  
Riza Aryani, Kismiyati, Gunanti Mahasri
Keyword(s):  
Water Quality ◽  
Freshwater Fish ◽  
Prevalence Rate ◽  
Slow Growth ◽  
Survey Methods ◽  
Economic Value ◽  
Prevalence Rates ◽  
Fish Size ◽  
Central Java ◽  
Possible Cause

Abstract Gouramy is one of the consumption of freshwater fish that have high economic value. Gouramy is a freshwater fish that have long been known and cultivated. Gouramy has many features including less demanding requirements for life, except that carp have slow growth. In maintenance appeared several constraints, such as illness. One possible cause is parasites. This research is aimed to know both the kind and the prevalence of gouramy gastrointestinal worms in Ngrajek Village Magelang Central Java. This research used survey methods through sampling at the site directly. Sample was taken once for 48 gouramy from four sites by using with fish size 10-15 cm. The main parameters of the research is the kind and prevalence degree of worms were found in the gastrointestinal of gouramy in the Ngrajek Magelang Central Java, while the supporting parameters in this research are water quality such as pH, temperature, dissolved oxygen (DO), and ammonia. The result of this research showed that from 48 gouramy from four sites, there was four samples that positively infected by gastrointestinal worms. The prevalence rate of gouramy infected with worms in the gastrointestinal for A location is 12.5%, for B location is 13.3%, for C location is 0%, and for D location is 10%. Worms prevalence rates are found in the gastrointestinal consists of Echinorhynchus 6.25%, Neoechinorhynchus 2.08% and Pallisentis 2.08%. Overall prevalence of gouramy infected with worms in the gastrointestinal in Ngrajek Village Magelang Central Java is 8.33%.

scholarly journals Vulnerability of male spider crab Maja brachydactyla (Brachyura: Majidae) to a pot fishery in south-west Ireland

2009 ◽  
Vol 89 (7) ◽  
pp. 1353-1366 ◽  
Author(s):  
Edward Fahy ◽  
Jim Carroll
Keyword(s):  
Carapace Length ◽  
Fishing Effort ◽  
Spider Crab ◽  
Mark Recapture ◽  
Fishing Season ◽  
South West ◽  
Fishing Capacity ◽  
One Year

The Magharees fishery (Brandon and Tralee Bays in south-west Ireland) is 495 km2 in extent, the majority of this area ≤20 m in depth. Since 1981 it has been occupied by a directed spider crab fishery yielding in some years all of the national catch of Maja brachydactyla. Maximum recorded landings were 336 t in 1999 and effort has numbered up to 10,000 pots annually. Increasing fishing capacity and declining opportunities have accentuated fishing effort on spider crab. This paper describes a catch census undertaken in the fishing season of March to August inclusive, 2000–2007 and a mark–recapture experiment, 2005–2007. A method of ageing the adult moult by attributing a chronology to the rate of erosion of the claw on the dactyl is introduced. Males migrated longer distances, moved into the fishery on a wider trajectory and demonstrated greater wear on the claw than females. Recapture rate of males was twice that of females. The conduct of the fishery changed in its 26 years in existence. Landings became more concentrated in the earlier months of the year and the recent summer fishery was characterized by fewer male captures. Larger males were quickly removed and none >140 mm carapace length survived in the fishery longer than one year.

scholarly journals Biological studies and assessment of the exploitation status of the green tiger shrimp Penaeus semisulcatus from Jizan Area, Red Sea

2017 ◽  
Vol 26 (2) ◽  
pp. 23-34
Author(s):  
Lafi S Alsolami and Hassan A Jastania Lafi S Alsolami and Hassan A Jastania
Keyword(s):  
Red Sea ◽  
Carapace Length ◽  
Growth Parameters ◽  
Biological Information ◽  
Tiger Shrimp ◽  
Biological Studies ◽  
Penaeus Semisulcatus ◽  
Biological Aspects ◽  
Exploitation Status ◽  
Annual Mortality

The present study was undertaken to investigate some biological aspects of the green tiger shrimp Penaeus semisulcatus in order to provide the biological information required for its proper management of the fishery in Jizan area, Red Sea. Growth parameters were calculated as (L∞ = 94.40; K = 0.81; to = -0.2); maximum age tmax = 3.7037 years; growth performance indices (ØL = 3.86; Øwt = 1.36). Carapace length at which P. semisulcatus females attained 50% of maturity was 38 mm. The annual mortality coefficients were (Z = 3.124 year-1; M = 1.163 year-1 & F = 1.961 year-1). Carapace length and age at first capture were 35.73 mm and 0.387 year, while carapace length and age at recruitment were 28.52 mm and 0.24 year, respectively. The length at first sexual maturity was found to be 38 mm, while the carapace length at first capture L50 was estimated as 35.73 mm .This indicates that there is a poor opportunity for the recruits of P. semisulcatus in Jizan area to spawn before fishing which is considered an important factor that would lead to overexploitation the stock. The estimated exploitation ratio (0.628) was higher than Emax (0.581) which indicates that, the fisheries status of this species under study is in overexploited.

scholarly journals Perencanaan kawasan karst sebagai kawasan geowisata di Kabupaten Grobogan, Jawa Tengah

2020 ◽  
pp. 149
Author(s):  
Reisya Rahma ◽  
Lury Sevita Yusiana ◽  
I Gusti Alit Gunadi
Keyword(s):  
Basic Concept ◽  
Protected Area ◽  
Research Method ◽  
Survey Methods ◽  
Karst Area ◽  
Tourist Attraction ◽  
Central Java ◽  
Plan Activity ◽  
Area Planning ◽  
Spatial Plan

The Karst Area Planning as an Area Geotourism in Grobogan Regency of Central Java. The karst area in Grobogan Regency is a geological protected area that includes the Sukolilo Karst Landscape Area. The karst area has a lot of potential that can be used as a tourist attraction. The karst area requires a plan in suitable with the potential and constraints. The planning can be done by developing the karst area as a geotourism. This research method uses survey methods which stages are inventary, analysis, synthesis, concepts, and planning. In the assessment analysis of the 12 attractions there are 4 (four) that have high potential to be developed i.e. Lawa and Macan Caves, Gulingan Waterfall, Lamping Hill and Widuri Waterfall. The basic concept of this planning uses the concept of geotourism as a special interest tour developed into a spatial plan, activity plan and facility plan. The final result of this planning are the site plan of attraction Lawa and Macan Caves, Waterfall Gulingan, Lamping Hill and Widuri Waterfall as a Geotourism that is implemented in the karst of Grobogan Regency.  

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