scholarly journals PERTUMBUHAN LOBSTER BATU (Panulirus penicillatus Olivier, 1791) DI PERAIRAN SIMEULUE, BARAT SUMATERA THE GROWTH RATE OF SPINY LOBSTER (Panulirus penicillatus Olivier, 1791) IN WATERS OF SIMEULUE, WEST SUMATERA

2019 ◽  
Vol 2 (2) ◽  
pp. 101
Author(s):  
Helman Nur Yusuf ◽  
Tegoeh Noegroho ◽  
Ali Suman
Keyword(s):  
Growth Rate ◽  
Spiny Lobster

Lobster batu (Panulirus penicillatus) merupakan komoditas perikanan yang penting dan telah diekspolitasi sejak paska tsunami di perairan Simeulue. Peningkatan pemanfaatan lobster telah menyebabkan tekanan terhadap populasi lobster; untuk itu perlunya data aspek biologi seperti pertumbuhan sebagai landasan dalam penentuan pengelolaan. Penelitian dilaksanakan pada bulan Juni sampai Desember 2015 di perairan Simeulue untuk menduga laju pertumbuhan lobster batu di perairan Simeulue. Hasil penelitian diperoleh rata-rata pertama kali tertangkap (Lc) = 64 mmCL untuk lobster batu betina dan 65 mm CL untuk lobster batu jantan. Laju pertumbuhan (K), panjang karapas asimtotik (CL∞) dan umur lobster batu betina pada panjang ke-0 (t0) sebesar 0,51 per tahun, 159,2 mm CL dan -0,049921 tahun, sedangkan lobster batu jantan sebesar 0,41 pertahun, 145,8 mm CL dan -0,040776 tahun. Laju mortalitas alami (M), laju kematian akibat penangkapan (F), laju kematian total (Z) dan tingkat eksploitasi (E) lobster batu betina sebesar 0,91 per tahun, 0,73 per tahun, 1,64 pertahun dan 0,55 pertahun. Sedangkan lobster batu jantan sebesar 0,81 pertahun, 0,76 per tahun, 1,57 pertahun dan ekploitasi sebesar 0,51 pertahun atau pemanfaatan sumberdaya lobster batu telah optimum. Untuk itu perlu adanya pembatasan upaya penangkapan lobster batu di Simeulue dengan menerapkan close season pada puncak musim pemijahan yaitu pada Mei dan Juni.

The spiny lobster, Jasus lalandei (H. Milne- Edwards), in South Australia. I. Growth of captive animals

1964 ◽  
Vol 15 (1) ◽  
pp. 77 ◽  
Author(s):  
DR Fielder
Keyword(s):  
Growth Rate ◽  
Carapace Length ◽  
Spiny Lobster ◽  
South Australia ◽  
Field Application ◽  
Small Animals ◽  
Absolute Increase ◽  
Length Changes ◽  
Increasing Temperature ◽  
Moulting Cycle

Carapace length and total length of the spiny lobster are directly related. Weight increases as the cube of the carapace length. Changes in morphology are used to describe the moulting cycle, and growth rate based on change in weight and length at moult is calculated. Increasing temperature increases the frequency of moulting. Absolute increase in length per moult does not differ significantly with size, but small animals moult more frequently than larger ones. The validity of data in relation to field application is discussed. Estimates of growth from this investigation compare favourably with results obtained in the field, and on captive animals by other authors for J. lalandei and related species.

scholarly journals PERCOBAAN PENANDAAN LOBSTER PASIR (Panulirus homarus Linnaeus, 1758) DI TELUK PRIGI

2019 ◽  
Vol 24 (4) ◽  
pp. 273
Author(s):  
Danu Wijaya ◽  
Amula Nurfiarini
Keyword(s):  
Growth Rate ◽  
Spiny Lobster ◽  
Coastal Region ◽  
Mark Recapture ◽  
Random Movement ◽  
Spiny Lobsters

Percobaan penebaran lobster pasir (Panulirus homarus) di Perairan Teluk Prigi, Kabupaten Trenggalek dilakukan pada 2015. Percobaan dilakukan dengan cara memberi tanda (tag) pada seluruh sampel lobster pasir yang ditebar, dikenal sebagai metode Capture-mark-recapture (CMR) dan sudah banyak digunakan untuk mempelajari populasi biota di alam. Penelitian bertujuan untuk mengetahui tingkat tertangkap kembali, laju pertumbuhan, dan pergerakan lobster pasir bertanda di Teluk Prigi. Penebaran lobster pasir bertanda dilakukan pada tiga lokasi yaitu Damas, Karanggongso dan Karangasem dengan jumlah 2.784 ekor dan diberi tanda jenis T-bar berwarna merah yang memiliki kode. Pengamatan lobster pasir bertanda yang tertangkap kembali dilakukan sepanjang tahun 2016 di Teluk Prigi (Februari-Desember). Tingkat tertangkap kembali lobster bertanda dihitung menggunakan proporsi antara lobster bertanda yang tertangkap dengan lobster bertanda yang ditebar. Laju pertumbuhan lobster bertanda yang tertangkap kembali dihitung berdasarkan pertumbuhan per satuan waktu yang sama dengan perubahan panjang dibagi dengan perubahan umur. Pergerakan lobster bertanda diukur melalui jarak dari lokasi tebar sampai dengan lokasi lobster bertanda yang tertangkap kembali. Tingkat tertangkap kembali lobster pasir (P. homarus) bertanda di Teluk Prigi sebanyak 4,7 %. Laju pertumbuhan lobster pasir yang tertangkap kembali rata-rata 0,09±0,05 mm/hari. Pergerakan lobster pasir bertanda yang tertangkap kembali di Teluk Prigi berkisar antara 0,1-11,36 km. Pergerakan lobster pasir bertanda memiliki kecenderungan acak dan tetap pada wilayah pantai.In 2015, restocking experiment of Scalloped spiny lobster (Panulirus homarus) was conducted in Gulf of Prigi, Trenggalek Regency and the  lobsters were tagged. This methods is known as Capture-mark-recapture (CMR). CMR is widely used to study of biota populations in wild nature. The aims of this study are to determine the recapture rate, growth rate, and movement of tagged scalloped spiny lobster in Prigi Bay.The tagged spiny lobster release was realesed at three locations, namely Damas, Karanggongso and Karangasem with 2,784 lobsters and was tagged with a red T-bar type that has a code. Observations of tagged scalloped spiny lobsters were carried out again throughout 2016 in Prigi Bay (February-December). The recapture rate of tagged spiny lobster is calculated using the proportion between the tagged lobster with the tagged lobster released. The tagged tagged spiny lobster growth rate is calculated again based on growth per unit time which is equal to the change in length divided by the change in age. Tagged spiny lobster movements are measured by distance from the location of release to the location of the tagged tagged spiny lobster is capture again. The recapture rate of tagged spiny lobster (P. homarus) marked in Gulf of Prigi as much as 4.7%. The growth rate of tagged spiny lobster averaged 0.09 ± 0.05 mm/day. The movement of tagged spiny lobster in Gulf of Prigi ranges from 0.1 to 11.36 km. The movement of tagged spiny lobster has a random movement  and remains in the coastal region.

scholarly journals Growth and Population Parameters of Panulirus penicillatus and Panulirus homarus in Labangka Tidal Waters, Indonesia

2020 ◽  
Vol 12 (2) ◽  
pp. 214
Author(s):  
Evron Asrial ◽  
Erwin Rosadi ◽  
Hamid Hamid ◽  
Muhammad Ichsan ◽  
Ruly Isfatul Khasanah ◽  
...  
Keyword(s):  
Growth Rate ◽  
Indian Ocean ◽  
Carapace Length ◽  
Spiny Lobster ◽  
Bottom Ash ◽  
Artificial Reef ◽  
Fishing Ground ◽  
Population Parameters ◽  
Biological Aspect ◽  
Tidal Waters

HighlightUtilization, Growth, and Population of Bullet Tuna (Auxis rochei Risso 1810) in Indian Ocean Southern Sumbawa (2020)Eligibility Status Kawakawa (Euthynnus affinis Cantor, 1849) from Lombok Strait and Indian Ocean Southern Sumbawa (2020)Biological Aspect of Parent Candidate of White-spotted Rabbitfish (Siganus canaliculatus) from Serewe Bay, Lombok Timur District (2020)Study of Sustainability in Management of Malabar Blood Snapper Fisheries in the Indian Ocean Coastal Waters, Sumbawa Regency (2020)Growth Rate and Survivorship of Acropora sp. Fragments that Transplanted on the Artificial Substrate Made from Fly Ash and Bottom Ash (2020)Reproductive Biological Aspect of Panulirus penicillatus in Sumbawa Island Waters, Indonesia (2019)Fisheries Resource Status of Spiny Lobster Panulirus penicillatus in Labangka Waters, South Sumbawa, Indonesia (2019)Growth Rate of Acropora formosa Coral Fragments Transplanted on Different Composition of Faba Kerbstone Artificial Reef (2019)Agribusiness of Edible Jellyfish Crambione mastigophora in Saleh Bay, NTB: Implementation of Sustainable Fisheries (2019)AbstractThe Labangka tidal waters, located south of Sumbawa Regency are the habitat and potential fishing ground for lobsters. The dominant species caught by the Labangka fishermen are the Panulirus penicillatus and P. homarus. Fishing pressure is one of the greatest factor influencing the biological and stock condition of lobsters in Labangka. The aim of this study is to determine the key attributes in growth and population parameters. Some attributes whose values are relatively stable compared to that of 2015, consist of conditional factors such as (old age), growth pattern (hypoallometric), growth coefficient (slow growth), exploitation rate (overexploited), and fishing rate (excessive fishing). While, attributes that have improved are carapace length at first capture (CLc) longer than 50% carapace length of infinity (0.5CL∞) and CL rate (CLc/0.5CL∞) reaching more than 1.00 (CLR > 1.00). In implementing sustainable management of spiny lobster for fishery resources, improvisation is needed in place of catching technologies. One of the recommendation is to add more fishing vessel (Lboat > 17.0 m) equipped with engines that are able to reach potential fishing ground in the west waters of Cemplung beach, Labangka.

Observations on the Growth Rate of the Immature Bermuda Spiny Lobster, Panulirus Argus

Ecology ◽  
1957 ◽  
Vol 38 (3) ◽  
pp. 526 ◽  
Author(s):  
W. H. Sutcliffe
Keyword(s):  
Growth Rate ◽  
Spiny Lobster ◽  
Panulirus Argus

The threshold energy for atom displacement in fcc metals

1990 ◽  
Vol 48 (4) ◽  
pp. 530-531
Author(s):  
Wilfried Sigle ◽  
Matthias Hohenstein ◽  
Alfred Seeger
Keyword(s):  
Growth Rate ◽  
Elevated Temperatures ◽  
Threshold Energy ◽  
Dislocation Loops ◽  
Absolute Minimum ◽  
Voltage Electron ◽  
Atom Displacement ◽  
Electron Microscopes ◽  
Fcc Metal

Prolonged electron irradiation of metals at elevated temperatures usually leads to the formation of large interstitial-type dislocation loops. The growth rate of the loops is proportional to the total cross-section for atom displacement,which is implicitly connected with the threshold energy for atom displacement, Ed . Thus, by measuring the growth rate as a function of the electron energy and the orientation of the specimen with respect to the electron beam, the anisotropy of Ed can be determined rather precisely. We have performed such experiments in situ in high-voltage electron microscopes on Ag and Au at 473K as a function of the orientation and on Au as a function of temperature at several fixed orientations.Whereas in Ag minima of Ed are found close to <100>,<110>, and <210> (13-18eV), (Fig.1) atom displacement in Au requires least energy along <100>(15-19eV) (Fig.2). Au is thus the first fcc metal in which the absolute minimum of the threshold energy has been established not to lie in or close to the <110> direction.

Saturation mechanism and generated viscosity in gravito-turbulent accretion disks

2020 ◽  
Vol 640 ◽  
pp. A53
Author(s):  
L. Löhnert ◽  
S. Krätschmer ◽  
A. G. Peeters
Keyword(s):  
Growth Rate ◽  
Numerical Simulations ◽  
Accretion Disks ◽  
Gravitational Instability ◽  
Turbulent Viscosity ◽  
Radial Distance ◽  
Maximum Growth ◽  
Wave Number ◽  
Radiative Cooling ◽  
Mixing Length

Here, we address the turbulent dynamics of the gravitational instability in accretion disks, retaining both radiative cooling and irradiation. Due to radiative cooling, the disk is unstable for all values of the Toomre parameter, and an accurate estimate of the maximum growth rate is derived analytically. A detailed study of the turbulent spectra shows a rapid decay with an azimuthal wave number stronger than ky−3, whereas the spectrum is more broad in the radial direction and shows a scaling in the range kx−3 to kx−2. The radial component of the radial velocity profile consists of a superposition of shocks of different heights, and is similar to that found in Burgers’ turbulence. Assuming saturation occurs through nonlinear wave steepening leading to shock formation, we developed a mixing-length model in which the typical length scale is related to the average radial distance between shocks. Furthermore, since the numerical simulations show that linear drive is necessary in order to sustain turbulence, we used the growth rate of the most unstable mode to estimate the typical timescale. The mixing-length model that was obtained agrees well with numerical simulations. The model gives an analytic expression for the turbulent viscosity as a function of the Toomre parameter and cooling time. It predicts that relevant values of α = 10−3 can be obtained in disks that have a Toomre parameter as high as Q ≈ 10.

TEMPERATURE DEPENDENCE OF THE CRYSTAL GROWTH RATE IN POLAR GLACIERS

1987 ◽  
Vol 48 (C1) ◽  
pp. C1-661-C1-662 ◽  
Author(s):  
J. R. PETIT ◽  
P. DUVAL ◽  
C. LORIUS
Keyword(s):  
Growth Rate ◽  
Crystal Growth ◽  
Temperature Dependence ◽  
Crystal Growth Rate
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