scholarly journals KOMPOSISI UKURAN CAKALANG (Katsuwonus pelamis) HASIL TANGKAPAN HUHATE YANG DIDARATKAN DI TULEHU, AMBON

2017 ◽  
Vol 3 (3) ◽  
pp. 199 ◽  
Author(s):  
Budi Nugraha ◽  
Siti Mardlijah ◽  
Enjah Rahmat
Keyword(s):  
Total Sample ◽  
Fish Length ◽  
Small Fish ◽  
Skipjack Tuna ◽  
Katsuwonus Pelamis ◽  
Weight Relationship ◽  
Result Show ◽  
The Individual ◽  
Relationship Of ◽  
Length Frequency Data

Eksploitasi sumber daya ikan cakalang (Katsuwonus pelamis) di perairan Laut Banda telah berlangsung lama. Saat ini sumber daya ikan cakalang telah memperlihatkan tanda-tanda overfishing. Indikasi ini antara lain ditandai oleh penurunan hasil tangkapan dan ukuran individu, perubahan komposisi hasil tangkapan, serta kecenderungan meningkatnya proporsi beberapa jenis ikan berukuran kecil. Data frekuensi panjang dikumpulkan dari bulan Maret sampai Desember 2007 berjumlah 4.293 ekor. Pengukuran panjang dan bobot untuk mengetahui hubungan panjang dan bobot ikan dilakukan pada bulan Maret, Mei, Juli, dan Desember 2007 dengan jumlah contoh 296 ekor. Tulisan ini menyajikan informasi tentang distribusi ukuran panjang dan bobot, hubungan panjang dan bobot ikan cakalang dan ukuran pertama kali tertangkap (Lc) hasil tangkapan huhate yang beroperasi di perairan Laut Banda. Hasil analisis menunjukan bahwa ikan cakalang mempunyai kisaran panjang cagak (FL) antara 30-78 cmFL dan kisaran bobot antara 600-4300 g. Analisis regresi hubungan panjang dan bobot diperoleh persamaan W=0,0485 L2,751, R2=0,9427 dengan nilai koefisien regresi (r)=0,9709, dan nilai slope (b)=2,751. Dari hasil analisis tersebut diketahui bahwa pola pertumbuhan ikan cakalang bersifat allometrik negatif. Ukuran pertama kali tertangkap (Lc) ikan cakalang oleh huhate adalah 41,7 cmFL. Eksploitasi sumber daya ikan cakalang (Katsuwonus pelamis) di perairan Laut Banda telah berlangsung lama. Saat ini sumber daya ikan cakalang telah memperlihatkan tanda-tanda overfishing. Indikasi ini antara lain ditandai oleh penurunan hasil tangkapan dan ukuran individu, perubahan komposisi hasil tangkapan, serta kecenderungan meningkatnya proporsi beberapa jenis ikan berukuran kecil. Data frekuensi panjang dikumpulkan dari bulan Maret sampai Desember 2007 berjumlah 4.293 ekor. Pengukuran panjang dan bobot untuk mengetahui hubungan panjang dan bobot ikan dilakukan pada bulan Maret, Mei, Juli, dan Desember 2007 dengan jumlah contoh 296 ekor. Tulisan ini menyajikan informasi tentang distribusi ukuran panjang dan bobot, hubungan panjang dan bobot ikan cakalang dan ukuran pertama kali tertangkap (Lc) hasil tangkapan huhate yang beroperasi di perairan Laut Banda. Hasil analisis menunjukan bahwa ikan cakalang mempunyai kisaran panjang cagak (FL) antara 30-78 cmFL dan kisaran bobot antara 600-4300 g. Analisis regresi hubungan panjang dan bobot diperoleh persamaan W=0,0485 L2,751, R2=0,9427 dengan nilai koefisien regresi (r)=0,9709, dan nilai slope (b)=2,751. Dari hasil analisis tersebut diketahui bahwa pola pertumbuhan ikan cakalang bersifat allometrik negatif. Ukuran pertama kali tertangkap (Lc) ikan cakalang oleh huhate adalah 41,7 cmFL. Exploitation of skipjack tuna resources in the Banda Sea have lasted long. Currently skipjack tuna resources have been showing signs of over fishing. Indications were, among others, characterized by a decrease in the catch and the size of the individual, changes in the composition of the catch and the trend of increasing proportions of several types of small fish. Length frequency data collected from March until December 2007 amounted 4,293. Length and weight measurements to determine the length and weight relationship of fish conducted in March, May, July, and December 2007 with a total sample was 296. This paper presents information about the distribution of length and weight, length and weight relationship and the length at first capture (Lc) caught by pole and liner operating in theBanda Sea. The analysis showed that the skipjack tuna has a long range between 30-78 cmFL and weight range between 600-4300 g. Regression analysis of length and weight relationship equation was W=0.0485 L2.751, R2=0.9427 with regression coefficient (r)=0.9709, and slope value (b)=2.751. Result show that the growth pattern of skipjack tuna was negative allometric. The length at first captured (Lc) of skipjack was 41.7 cmFL.

scholarly journals Growth patterns of skipjack tuna (Katsuwonus pelamis, linnaeus 1758) caught by troll line in Prigi waters, Trenggalek East Java Indonesia

2021 ◽  
Vol 890 (1) ◽  
pp. 012047
Author(s):  
G Bintoro ◽  
T D Lelono ◽  
D Setyohadi ◽  
U Fadzilla
Keyword(s):  
Fat Body ◽  
Sampling Period ◽  
Fishing Effort ◽  
Growth Patterns ◽  
Skipjack Tuna ◽  
Market Demand ◽  
Katsuwonus Pelamis ◽  
Weight Relationship ◽  
The Pacific ◽  
Relationship Of

Abstract Skipjack tuna (Katsuwonus pelamis) is an important pelagic fish species caught in tropical and subtropical waters of the Pacific, Atlantic, and Indian oceans. Skipjack tuna (K. pelamis) is also a high economic fisheries resource in Prigi waters which is caught by troll line. High market demand results in high levels of exploitation. This study aimed to identify the length-weight relationship and biological reproduction of skipjack tuna in the Prigi waters. The research was conducted in the sampling period between December 2019 - April 2020 with total samples obtained as much as 1642 fish and was analyzed using linear regression. The results informed that the length-weight relationship of skipjack tuna was positive allometric with equation W=0.007FL3.223 which means that the fish has a fat body. The sex ratio between male and female fish is 1:1. While gonad maturity level obtained in this study is mostly in GML 1 and GML 2 which indicates that the catches were dominated by immature fish, so it is necessary to limit fishing effort so that sustainability of the skipjack tuna (K. pelamis) resource can be managed.

Are there one or two stocks of Scoranza bleak - Alburnus scoranza Bonaparte, 1845 in Lake  Skadar (Montenegro)

2021 ◽  
Vol 40 ◽  
pp. 80-92
Author(s):  
Drago Marić ◽  
Katarina Burzanović
Keyword(s):  
Condition Factor ◽  
Accurate Determination ◽  
The Elderly ◽  
Total Sample ◽  
Population Variability ◽  
Winter Period ◽  
Small Fish ◽  
Mean Values ◽  
Weight Relationship ◽  
Lake Skadar

This paper provides the first comprehensive information on the Length-Weight Relationship (LWR) of Scoranza bleak (Alburnus scoranza) from the Lake Skadar. The results of the study showed that LWR was different in young and older individual fish. We concluded that no single regression would adequately describe the length-weight relationship for  Scoranza bleak in the winter period. Small fish, up to one year old, have positive allometric growth whereas older and larger, negative. The results of this study show that the animals grow equally in the same pattern in both localities (Raduš and Karuč) which shows that there are no two stocks as it was assumed in the past. The condition factor in young Scoranza bleaks was lower than in the elderly. Condition factor decreased significantly during the winter period in older specimens. Based on this, we conclude that Scoranza bleak during the winter is poorly fed/starved, which causes a decrease in the condition factor.Analysis of the total sample, of any species, cannot show by what rule the population grows, if infrapopulation variability is present, because the studied value will depend on the number of individual subgroups. If no infra-population variability is found, the required parameter for the entire population can be calculated. In order to determine population variability, multiple groups must be singled out. Preferably, the number of stratified samples should be at least 6 so that correlation-regression analysis can be performed. In stratified samples, the number of individuals should be between 30-40, for any parameter, in order to compare their mean values. The results of the study show that 50 individuals are sufficient for accurate determination of LWR (or ???? and b, ???? is a constant coefficient and b is the slope of the curve.), when it is determined that there is no intrapopulation variability.

scholarly journals Pemanfaatan Data Biologi Ikan Cakalang (Katsuwonus pelamis) dalam Rangka Pengelolaan Perikanan Bertanggung Jawab di Perairan Teluk Bone

2012 ◽  
Vol 14 (1) ◽  
pp. 107 ◽  
Author(s):  
Muhammad Jamal ◽  
Muhammad Fedi Alfiadi Sondita ◽  
John Haluan ◽  
Budy Wiryawan
Keyword(s):  
Growth Model ◽  
Fisheries Management ◽  
Growth Pattern ◽  
Fork Length ◽  
Biological Characteristics ◽  
Skipjack Tuna ◽  
Katsuwonus Pelamis ◽  
Management Zone ◽  
Weight Relationship ◽  
First Maturity

The Bone Bay is part of Fisheries Management Zone WPPI 713 that covers Makassar strait, Flores sea and Bali sea. To such vast marinearea, fisheries management can be started from smaller region, e.g. embayment waters. Biological characteristics of skipjack tuna (Katsuwonuspelamis) are some of important information for developing fisheries management in the area. This research was aimed to determine length-weight relationship, size composititon, growth pattern and biologically feasible size of the fish. Data were obtained from fish caught byfisherman from Januari to December 2007. The bay was divided into three study areas, i.e. Northern, Centre and Southern Zones. The bcoefficients for length-weight relationship in the three zones were equal 3 [not significant]. The average fork-length (FL) in each zoneshowed similar trends: increased from January to June, then stabilized until December. Using von Bertalanffy’s growth model, the maximumFL (L ∞ of 759.75 mm is estimated for fish at age of 84 months. The length at first maturity of the fish is 465 mm (FL).

scholarly journals Faktor individu dalam prediksi diabetes mellitus tipe 2 di Salatiga Jawa Tengah

2017 ◽  
Vol 33 (2) ◽  
pp. 55
Author(s):  
Priscila Evangelin Asa ◽  
Dibyo Pramono ◽  
Suryono Yudha Patria
Keyword(s):  
Diabetes Mellitus ◽  
Family History ◽  
Total Sample ◽  
Individual Factors ◽  
Chi Square ◽  
Family History Of Diabetes ◽  
Develop Diabetes Mellitus ◽  
History Of ◽  
The Individual ◽  
Relationship Of

Individual factors as predictors of diabetes mellitus in SalatigaPurposeThe purpose of this study was to determine the relationship of the individual factors with the incidence of diabetes mellitus in Salatiga.MethodsThe research was a case control study conducted from April to June 2016 around the existing health centers in the Salatiga. The total sample was 156 respondents. Data analysis used McNemar’s Chi-square and multiple logistic regression conditional tests.ResultsThe variables associated with the incidence of diabetes mellitus was a family history of diabetes. People who have a family history of diabetes have a risk 41 times more likely to develop diabetes mellitus compared with people who do not have a family history of diabetes mellitus in Salatiga.ConclusionThis study concluded that the incidence of diabetes mellitus is affected by family history. Primary health care is expected to cooperate with health office to conduct prevention efforts such as activities that encourage physical activity.

scholarly journals The Stock Status of Skipjack Tuna (Katsuwonus pelamis) in Tomini Bay and Its Surrounding Areas, Indonesia

2021 ◽  
Vol 934 (1) ◽  
pp. 012085
Author(s):  
S Mardlijah ◽  
A R P Pane ◽  
A S Panggabean
Keyword(s):  
Population Dynamics ◽  
Landing Site ◽  
Total Sample ◽  
Utilization Rate ◽  
Skipjack Tuna ◽  
Katsuwonus Pelamis ◽  
Stock Status ◽  
Fish Recruitment ◽  
Surrounding Areas ◽  
And Control

Abstract Skipjack tuna (Katsuwonus pelamis) is an essential part of tuna, skipjack tuna, and mackerel tuna trades in Indonesia as the species is an economic commodity with export value. Tomini Bay is one of the areas in Indonesia with intensive skipjack tuna exploitation activities using purse seine fleets. Such a high fishing rate requires management efforts to maintain the species population’s sustainability. This study was conducted in April 2018–December 2019 at a fish landing site in Gorontalo City with a total sample of 8,833 skipjack tunas. The population dynamics, recruitment, and utilization rate were analyzed using FISAT II application and ELEFAN program. The results showed that the length at first capture (Lc) was 31.8 cmFL (in 2018) to 32.2 cmFL (in 2019) at around 1.3 year old. The fish recruitment occurred all year long, peaking in May at 16.12%. In addition, the utilization rate (E) of the species was 0.47, meaning that the species was already moderate to fully exploited. The suggested practical management efforts to maintain the population of the skipjack tunas in the area are to stop the fishing efforts from growing and control the size of the mesh for fishing.

First maturity assessment and allometric growth of skipjack tuna, Katsuwonus pelamis (Linnaeus, 1758), landed at Ternate Island

2014 ◽  
Vol 2 (2) ◽  
pp. 29
Author(s):  
Adi Noman Susanto ◽  
Lawrence J.L Lumingas
Keyword(s):  
Head Circumference ◽  
Sexual Maturity ◽  
T Test ◽  
Skipjack Tuna ◽  
Allometric Growth ◽  
Katsuwonus Pelamis ◽  
Weight Relationship ◽  
Significant Difference ◽  
Student’S T ◽  
Student’S T Test

Title (Bahasa Indonesia): Pendugaan pertama matang kelamin dan pertumbuhan alometri ikan cakalang, Katsuwonus pelamis (Linnaeus, 1758), yang didaratkan di Pulau Ternate Skipjack tuna, Katsuwonus pelamis (Linnaeus, 1758), is a very important species for Indonesian fisheries.  A total of 462 specimens (254 males and 208 females) collected from fish landings in Ternate Island from November 2013 to April 2014 were used to estimate length at first sexual maturity, length-weight relationship, and length-head circumference relationship. The length at first sexual maturity (FL50) was 489.68 mm. The length-weight relationship equations were  W = 0.0001*FL2.7232 for males and W = 0.0002*FL2.6595 for females, respectively. Student’s t-test indicated significant deviation of ‘b’ from ‘3’ towards negative allometric growth (p< 0.05).  The length-head circumference relationship equations were HC = 0.5453*FL1.0263for males and HC = 0.6519*FL0.9985for females, respectively. Student’s t-test indicated no significant deviation of ‘b’ from ‘1’ towards isometric growth (p> 0.05).  Analysis of covariance showed that there was no significant difference between sexes (p> 0.05) for both relationships. Hence, a common length-weight relationship and a common length-head circumference relationship can be derived using pooled data of both sexes. Ikan cakalang, Katsuwonus pelamis (Linnaeus, 1758) merupakan  spesies yang sangat penting untuk perikanan Indonesia.  Sejumlah 462 spesimen (254 jantan dan 208 betina) ikan cakalang yang diperoleh dari ikan yang didaratkan di Pulau Ternate, selama periode November 2013 sampai April 2014 telah digunakan untuk menduga panjang matang kelamin pertama, hubungan panjang-berat, dan hubungan panjang-keliling lingkar kepala. Panjang pada saat matang kelamin pertama (PC50) adalah  489,68 mm. Persamaan hubungan panjang-berat diperoleh BT = 0,0001*PC2,7232 untuk jantan dan BT = 0,0002*PC2,6595 untuk betina. Hasil uji-t Student menunjukkan penyimpangan yang nyata ‘b’ dari ‘3’ cenderung ke arah pertumbuhan alometrik negatif (p < 0,05).   Persamaan hubungan panjang-keliling lingkar kepala diperoleh LK = 0,5453*PC1,0263 untuk jantan dan LK = 0,6519*PC0,9985 untuk betina. Hasil uji-t Student menunjukkan deviasi yang tidak nyata nilai ‘b’ dari ‘1’ yang cenderung ke arah pertumbuhan isometrik (p > 0,05).   Analisis kovarians menunjukkan bahwa tidak terdapat perbedaan yang nyata antara jantan dan betina (p > 0,05) untuk kedua hubungan tersebut di atas. Oleh karena itu, suatu hubungan panjang-berat umum dan suatu hubungan panjang-lingkar kepala umum dapat dibuat dengan menggunakan data gabungan kedua jenis kelamin.

scholarly journals Estimation of birthdates and catch-at-age using length frequency analysis (LFA), with application for skipjack tuna (Katsuwonus pelamis) caught in the Southwest Atlantic

2004 ◽  
Vol 61 (5) ◽  
pp. 798-811 ◽  
Author(s):  
Humber A. Andrade ◽  
Paul G. Kinas
Keyword(s):  
Frequency Analysis ◽  
Growth Parameters ◽  
Information Criterion ◽  
Skipjack Tuna ◽  
Length Frequency ◽  
Southwest Atlantic ◽  
Katsuwonus Pelamis ◽  
Length Data ◽  
Length Frequency Data ◽  
Length Frequency Analysis

Abstract Converting length frequencies into age frequencies is an important component of a fisheries assessment. In this paper we use a length frequency analysis (LFA) to estimate birthdates after converting length data into catch-at-age, and use simulation studies to compare model-selection criteria and to examine the reliability of the resulting estimates. Deviance and an adaptation of the Akaike Information Criterion performed best. LFA results in useful estimates of birthdates and of catch-at-age if reliable length frequency data and estimates of growth parameters are available. The analysis is applied to skipjack tuna (Katsuwonus pelamis) caught in the Southwest Atlantic Ocean. Although spawning is reported to be seasonal in subtropical waters, the birthdates of the fish caught there were spread uniformly across the year. Young skipjack become vulnerable to fishing mainly in the first quarter of each year. Recruitment of strong year classes did not affect fishery yields equally in the Southwest Atlantic and the Caribbean Sea, so the assumption of a unit western stock for management purposes and the stock structure of skipjack in the Atlantic need further evaluation.

scholarly journals LENGTH-WEIGHT RELATIONSHIP OF THE SIX MOST ABUNDANT FISH SPECIES IN PRAWN FISHERY SEMI-FIXED TRAP BYCATCHES IN THE LOWER AMAZON REGION (PARÁ, BRAZIL)

2021 ◽  
Vol 47 ◽  
pp. e628
Author(s):  
Luan Campos IMBIRIBA ◽  
Diego Maia ZACARDI ◽  
Severino Adriano de Oliveira LIMA ◽  
Raniere Garcez Costa SOUSA
Keyword(s):  
Fish Species ◽  
Sexual Maturity ◽  
Socioeconomic Development ◽  
Amazon Region ◽  
Small Fish ◽  
Fishing Gear ◽  
Weight Relationship ◽  
Nylon Mesh ◽  
Relationship Of

In this study, the length-weight relationships (LWR) were estimated for six fish species captured during prawn fishing in the Lower Amazon region (Pará, Brazil). Prawn fishing boosts the socioeconomic development of riverine communities and is a relevant activity as a source of income and subsistence in this region. In addition, we registered new LWRs for the species Ossancora punctata and Hypoptopoma elongatum. The samplings were performed in prawn catches monthly from February 2018 to January 2019, using a “matapi”, which consists of a semi‑fixed trap that has a galvanized iron structure (2.5 m height by 2.0 m in length) and nylon mesh (1.40 x 1.60 mm mesh), and has two tapered openings to facilitate the entry and trapping of the prawn. The results show that 75% of the fish caught as prawn bycatches had not yet reached sexual maturity. Thus, it is clear that fisheries need to develop fishing gear that allow small fish to escape from the traps during the prawn fishery.

scholarly journals Condition and length-weight relationship of the horse mackerel (Trachurus trachurus L.) and the Mediterranean horse mackerel (Trachurus mediterraneus L.) from the eastern Adriatic sea

2011 ◽  
Vol 63 (2) ◽  
pp. 421-428 ◽  
Author(s):  
M. Santic ◽  
Biljana Radja ◽  
Antonela Paladin
Keyword(s):  
Adriatic Sea ◽  
Condition Factor ◽  
Total Sample ◽  
Bottom Trawl ◽  
Horse Mackerel ◽  
Trachurus Trachurus ◽  
B Values ◽  
Weight Relationship ◽  
Males And Females ◽  
Relationship Of

The length-weight relationship and variation of condition factor in relation to the total length (TL) of Trachurus trachurus (Linnaeus, 1758) and Trachurus mediterraneus (Steindachner, 1868) were studied. Samples were collected in the eastern Adriatic Sea using bottom-trawl during 2008 and 2009. The b values for males, females and total sample showed that the growth of T. trachurus was isometric, i.e. equal in length and weight. The growth of the males and females of T. mediterraneus was positively allometric while the total sample (males, female and immature) showed isometric growth. The condition factor was calculated indicating the smallest values in immature specimens. The highest values of condition factor for males and females of both species were observed in the range of TL from 16 to 19 cm and 31 to 33 cm, respectively.

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