scholarly journals Biomorphometry of coconut crabs (Birgus latro) in Laigoma Island, North Maluku, Indonesia

2021 ◽  
Vol 890 (1) ◽  
pp. 012065
Author(s):  
Suryani ◽  
M S Widodo ◽  
U Yanuhar ◽  
A Suprijanto
Keyword(s):  
Sex Ratio ◽  
Carapace Width ◽  
Maturity Level ◽  
Ratio Distribution ◽  
Spawning Period ◽  
Male And Female ◽  
Gonad Maturity ◽  
Native Habitat ◽  
The Relationship ◽  
Land Clearance

Abstract Coconut crab is a coastal animal that lives in costal forest on islands of tropical Indo-Pacific. Crab populations are currently under threat of extinction. Several issues contribute to this, including high levels of exploitation, degradation of their native habitat, land clearance, and plantations development. This study aimed to examine the biomorphometric of coconut crabs, which includes the composition, sex ratio, distribution, widht and weight relation, condition factors and gonad maturity level. The descriptive explorative methods was used in this research. The results showed that the composition of 156 coconut crabs consisted of 82 females. The results obtained a balanced sex ratio. The size of the carapace width obtained ranged from 40.15 to 88.55 mm, with a weight of 150-565 grams. The relationship between width and capacity is allometric. The values obtained from these factors ranged from 1.01 to 1.03 for men and 1.01 to 1.012 for females. The gonad maturity level of male and female mud crabs was dominated by TKG III and IV. This indicated that the research time was in spawning period.

scholarly journals Biomorfometrik Kepiting Bakau (Scylla sp.) Hasil Tangkapan di Perairan Semarang Guna Menunjang Konservasi Sumberdaya Hayati

2018 ◽  
Vol 7 (2) ◽  
pp. 81 ◽  
Author(s):  
Anggun Sri Hardiyanti ◽  
Sunaryo Sunaryo ◽  
Ita Riniatsih ◽  
Adi Santoso
Keyword(s):  
Condition Factor ◽  
Carapace Width ◽  
Economic Value ◽  
Maturity Level ◽  
Ratio Distribution ◽  
Spawning Period ◽  
Gonad Maturity ◽  
Male Ratio ◽  
Mangrove Crab ◽  
Almost All

Kepiting bakau (Scylla sp.) merupakan komoditas perikanan yang memiliki nilai ekonomi tinggi. Permintaan terhadap komoditas kepiting dari tahun ke tahun cenderung meningkat, sehingga dalam memenuhi semua permintaan ini seluruhnya berasal dari hasil tangkapan di alam, yaitu sebesar 70% dan banyaknya penangkapan kepiting bakau tanpa memperhatikan ukuran yang layak tangkap. Penelitian ini bertujuan untuk mengkaji biomorfometrik kepiting bakau, meliputi jumlah, distribusi, nisbah kelamin, hubungan lebar karapas dan berat, faktor kondisi dan tingkat kematangan gonad. Penelitian menggunakan metode deskriptif eksploratif. Penelitian dilaksanakan pada bulan  Mei – Juni 2017 di kawasan perairan Semarang, yaitu di Mangkang Wetan, Tapak, Tanah Mas dan Tambak Lorok. Hasil penelitian menunjukkan, bahwa jumlah kepiting bakau yang diamati sebanyak 616 ekor, terdiri atas 362 betina (58,77%) dan 254 jantan (41,23%), perbandingan betina dan jantan 1,43 : 1. Ukuran lebar karapas berkisar antara 47,05 - 132,56 mm dengan berat berkisar antara 33,02 - 513,09 g. Hubungan lebar karapas dengan berat bersifat allometrik negatif dan positif. Nilai faktor kondisi yang didapatkan berkisar 1,368 – 9,752. Tingkat kematangan gonad kepiting betina maupun jantan didominasi oleh TKG II dan III, dengan demikian diduga pada bulan Mei – Juni di perairan Semarang sedang terjadi masa pemijahan. Biomorphometry of Mangrove Crab (Scylla sp.) Catched in SemarangMangrove crab (Scylla sp.) is one of the fishery commodities that have high economic value. The demand for crab commodity from year to year tends to increase, in order to fulfilling all these demands almost all of them come from the catch in nature that is equal to 70%, and this led to the occurrence of a lot of mangrove crab catching regardless of the size of the catch. This study aimed to examine the biomorphometric of mangrove crab, which includes the composition, sex ratio distribution, widht and weight relation, condition factors and gonad maturity level. The descriptive explorative methods was used in this research. This research was conducted from May - June 2017 in the Semarang waters included Mangkang Wetan, Tapak, Tanah Mas and Tambak Lorok. The results showed that the composition of mangrove crab were 616, consist of 362 females (58,77%) and 254 males (41,23%), with the comparison of female and male ratio of 1,43 : 1. The size of the obtained carapace width ranged from 47,05 - 132,56 mm with the size of the weight ranged from 33,02 – 512,09 g. The relations between width and weight of caparace indicated allometric. The value of the obtained condition factor ranged from 1,368 – 9,752. Gonad maturity level of male and female mangrove crab was dominated by TKG II and III, because the research location was in the spawning period.

scholarly journals Reproductive biology of silurid catfishes Ompok miostoma (Vaillant 1902) in Mahakam River East Kalimantan

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
. Jusmaldi ◽  
Dedy Duryadi Solihin ◽  
Ridwan Affandi ◽  
MF Rahardjo ◽  
Rudhy Gustiano
Keyword(s):  
Sex Ratio ◽  
Reproductive Biology ◽  
Spawning Season ◽  
Spawning Period ◽  
Male And Female ◽  
Gonad Maturity ◽  
East Kalimantan ◽  
Fish Samples ◽  
Total Fish ◽  
Somatic Index

Reproductive biology of silurid catfish O.miostoma(Vaillant 1902)as one of endemic species in Mahakam River East Kalimantan is not yet known. This study aimed to analysisreproductive aspect related to changing seasons, including sex-ratio, spawning season, spawning location, length at first gonad maturity, gonado-somatic index, and fecundity. Total fish samples (n=1214)were collected monthly from November 2013 to October 2014 at four locations in the Mahakam River, using many fishing gears.The results of this research showthe total length of fish ranged from 132.19 to 227.30 mm and weight ranged from 20.00 to 70.40 g. The overall sex ratio of male and female was1: 1.56, while at gonad maturity stages were1:1.77. The spawning season range from November to January and peak spawning occurs in December. The highest spawning location was found at swamp flood Semayang Lake. The length at first gonad maturity of male ranged of 191.05-202.60 mm, while it was in 179.56-198.50 female. Maximum average gonado-somatic index (GSI) values obtained for male and female were 0.32 and 2.07 respectively during spawning period in November and declined to minimum in February. The total fecundity and eggs diameter rangedfrom 2648 to 12495 eggsind-1and 0.61 to 1.30 mm respectively. There was a positive correlation between fecundity andtotal length and weightof fishes.AbstrakBiologi reproduksi ikan lais O. miostoma (Vaillant 1902)sebagai salah satu spesies endemik di Sungai Mahakam Kalimantan Timur belum pernah diketahui. Tujuan penelitian ini adalah menganalisisaspek reproduksi ikan laisberkaitan dengan perubahan musimyang mencakupnisbah kelamin, musim pemijahan, lokasi pemijahan, ukuran kali pertama matang gonad, indeks kematangan gonad dan fekunditas.Total ikan contoh 1214 ekor telah dikumpulkan setiap bulan mulai dari bulan November 2013 sampai Oktober 2014di empat lokasi perairan Sungai Mahakam, menggunakan berbagai alat tangkap. Hasil penelitian menunjukkanukuran panjang total ikan berkisar dari 132,19-227,30 mm dan bobot berkisar dari  20,00-70,40 gram.Nisbah kelamin seluruh ikan jantan dan betina yang diamati 1 : 1,56, sedangkanpada tahap kematangan gonad 1:1,77. Musim pemijahan terjadi mulai dari bulan November sampai Januari dan puncak pemijahan pada bulan Desember. Lokasi pemijahan tertinggi ditemukan di rawa banjiran Danau Semayang. Ukuran ikan pertamamatang gonad pada jantan berkisar dari 191,05-202,60 mm dan betina berkisar dari 179,56-198,50 mm. Rata-rata indeks kematangan gonad (IKG)  tertinggi ditemukan pada jantan dan  betina berturut turut 0,32  dan 2,07 selama musim pemijahanpada bulan November dan menurun hingga terendah pada bulan Februari. Fekunditas total berkisar dari 2.648-12.495 butir telur per individu.Ada korelasi positif antara fekunditas dengan panjang total dan bobot ikan.

scholarly journals ANALISA ASPEK REPRODUKSI IKAN TOMAN (Channa micropeltes) DI SUNGAI BELIDA KABUPATEN MUARA ENIM

2020 ◽  
Vol 8 (1) ◽  
pp. 12-21
Author(s):  
Danang Yonarta ◽  
Yulisman Yulisman ◽  
Riswandi Riswandi
Keyword(s):  
Sex Ratio ◽  
Time Interval ◽  
Maturity Level ◽  
Female Fish ◽  
Natural Conditions ◽  
Male And Female ◽  
Gonad Maturity ◽  
Fish Resources ◽  
Gonadal Maturity ◽  
Abundant Population

Management of snakehead fish resources in swamp waters need to be done to anticipate a decline in stock in the waters. At this time the area where snakehead fish still have an abundant population is in southern sumatera, precisely in the Belida River, Muara Enim Regency. Until now there has been no information regarding the reproductive aspects of snakehead fish, their location and spawning season. The purpose of this study was to obtain information about the reproductive aspect of snakehead fish which includes sex ratio, gonad maturity level. Gonad maturity index and egg fecundity. The research was conducted in September-December 2019. The location was determined based on the natural conditions of the Belida River and human activities. Fish sampels were caught using experimental gill nets with ½ mash net size. Sampling of fish is done every 4 months with a time interval of once a month. The resuls of study in the male and female fish ratio 1,6:1. This ratio consisted of 109 fish (62,3%) and 66 female fish (37,7%). Gonadal maturity indeks  for male snakehead fish ranged from 0,21 to 0,86, while female snakehead fish ranged from 1,18 to 2,30. snakehead fish egg fecundity were 24.786 eggs with a diameter of 2,20 – 2,51

scholarly journals Reproductive Snakehead Fish (Channa striata Bloch, 1793) in Swamps Waters

2021 ◽  
Vol 328 ◽  
pp. 08013
Author(s):  
Sunarni Sunarni ◽  
Sisca Elviana ◽  
Stenly M B S Wairara
Keyword(s):  
Data Analysis ◽  
Sex Ratio ◽  
Maturity Level ◽  
Male And Female ◽  
Gonad Maturity ◽  
Channa Striata ◽  
First Time ◽  
Fish Gonads

The purpose of this study was to determine the reproduction of Snakehead fish (Channa striata Bloch, 1793) in the waters of the Merauke district wasur swamp. The data analysis used was the sex ratio, the level of gonad maturity, and the first size of gonad maturity. The results showed that the sex ratio of male and female snakehead fish in October and November at stations I and II tended to be balanced, while in September the sex ratio of snakehead fish at station I was balanced and at station II was not balanced. The maturity level of snakehead fish gonads at TKG III in September was around 35.48%, in October 28.57% and 15.38% in November. The size of the first time the gonads were ripe, the results showed that the first time the fish were ripe, the gonads were 190 mm long and weighing 50.3 g.

scholarly journals Biologi Rajungan Ditinjau dari Aspek Morfometrik dan Sex Ratio yang Didaratkan di Perairan Rembang

2020 ◽  
Vol 9 (1) ◽  
pp. 65-74
Author(s):  
Muhammad Juli Hendra Putra ◽  
Subagiyo Subagiyo ◽  
Ria Azizah Tri Nuraini
Keyword(s):  
Sex Ratio ◽  
Conservation Management ◽  
Economic Value ◽  
Swimming Crab ◽  
Maturity Level ◽  
Portunus Pelagicus ◽  
Male And Female ◽  
Gonad Maturity ◽  
Total Female ◽  
The Village

ABSTRAK : Rajungan (Portunus pelagicus) memiliki nilai ekonomi tinggi, berbanding lurus dengan penangkapan yang meningkat. Tingkat pemanfaatan yang tidak konservatif akan mempengaruhi  ukuran dan kondisi rajungan di suatu populasi, serta stok rajungan di suatu perairan. Penelitian bertujuan untuk mengetahui kajian konservasi rajungan (Portunus pelagicus) berdasarkan morfometri dan sex ratio yang didaratkan oleh nelayan  di Perairan Desa Gegunung Wetan, Kecamatan Rembang, Kabupaten Rembang. Metode yang digunakan dalam penelitian bersifat deskriptif. Pengamatan rajungan dilakukan pada salah satu pengepul di Desa. Rajungan di amati berdasarkan morfometri dan sex rasio selama 30 hari. Hasil Informasi dapat dijadikan pedoman dalam menentukan kebijakan mengenai pengelolaan perikanan rajungan yang berkelanjutan dan bersifat konservatif. Hasil dari penelitian diketahui bahwa kelimpahan rajungan jantan sebesar 46% (1379 ekor) rajungan betina 56% (1621 ekor) dari 3000 ekor sampel rajungan. Rasio perbandingan jantan dan betina 1:1,18. Berdasarkan distribusi ukuran lebar karapas rajungan di perairan Rembang adalah berkisar anatara 72–167  mm dan distribusi berat sebesar 40–303 gram. Distribusi tingkat kematangan gonad pada perairan Rembang adalah 608 ekor pada TKG 1; 658 ekor pada TKG 2; dan 355 pada TKG 3. Data menunjukan bahwa pola pertumbuhan rajungan yang ada di perairan Rembang adalah allometrik negatif  baik rajungan jantan maupun rajungan betina. Abstract: Blue swimming crab (Portunus pelagicus) has a high economic value, directly proportional to the increased catch. The level of non-conservation utilization will affect the size and condition of the blue swimming crab in a population, as well as the blue swimming crab stock in a waters. This study is aimed to determine the blue swimming crab conservation study (Portunus pelagicus) based on morphometry and sex ratio brought by fishermen in the waters of Gegunung Wetan Village, Rembang District, Rembang Regency. The method used in this study is descriptive. Observation of blue swimming crab samples was carried out in one of the collectors in the village. Blue swimming crab was observed based on morphometry and sex ratio for 30 days. Informative results can be used as a guide in determining policies regarding sustainable and conservation management of blue swimming crab fisheries. The results of the study revealed that the abundance of male blue swimming crab was 46% (1379 male blue swimming crab) and the abundance of the female blue swimming crab was 56%  (1621 female blue swimming crab) of 3000 blue swimming crab samples. The ratio of male and female  is 1:1.18. Based on the size distribution of the width of the blue swimming crab carapace in the waters of Getanung Wetan it ranges from 72-167 mm and the distribution of weight is 40-303 grams. 13.8% (413 blue swimming crab) sized≤10 cm and 86.2% (2587 blue swimming crab) sized ≥10 cm. The distribution of gonad maturity level in the waters of Gegunung Wetan is 608 female blue swimming crab at TKG 1; 658 female blue swimming crab at TKG 2; and 355 female blue swimming crab at TKG 3. There were 355 female blue swimming crab (22%) of the total female blue swimming crab laying eggs. The data showed that the blue swimming crab growth pattern in Gegunung Wetan waters was negative allometric both male and female blue swimming crab.

scholarly journals Stock Status of Blue Swimming Crab (Portunus pelagicus Linnaeus, 1758) in Tiworo Strait Waters, Southeast Sulawesi, Indonesia

2020 ◽  
Vol 25 (2) ◽  
pp. 85-90
Author(s):  
Yustika Permatahati Intan Permatahati ◽  
Nila Nikmatia Bugis ◽  
La Sara ◽  
Tezza Fauzan Hasuba Hasuba
Keyword(s):  
Carapace Width ◽  
Growth Patterns ◽  
Fishing Ground ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Male And Female ◽  
Gonad Maturity ◽  
Stock Status ◽  
Spawning Potential Ratio ◽  
Very High

The blue swimming crab (BSC) fishery in Tiworo Strait has been heavily exploited since two decades ago when its worldwide demand and price was very high. Study on population aspects of this organism in this waters is limited. The aim of present study was to investigate growth patterns, population stock status, and size at first gonad maturity of Portunus pelagicus. One of the main fishing ground of BSC around Tiworo Strait waters is at Bangko and Gala Islands. Samples of BSC were taken monthly using gillnet and collapsible trap. Each sample taken was identified its sex, measured its carapace width, and weighed. Data collected from fishing ground of BSC were analyzed to find out growth patterns, population stock status using spawning potential ratio (SPR) method, and the first gonad maturity (CW50). The results of study showed that growth patterns of BSC male and female following isometric growth patterns (b=0) (P<0.05). It was found out that SPR of BSC from both fishing ground was 22.46% and 23.71%, respectively which indicates that population stock status of BSC in Tiworo strait waters is “moderate level” (SPR > 20%). The size at first gonad maturity (CW50) was attained at carapace width of 9.16 cm for male and 10.16 cm for female. Those imply that BSCs allowed to be caught should be >10 cm. 

Morphometry and Gonad Maturity of Male Snow Crab, Chionoecetes opilio

1992 ◽  
Vol 49 (12) ◽  
pp. 2460-2468 ◽  
Author(s):  
Michel Comeau ◽  
Gérard Y. Conan
Keyword(s):  
Carapace Width ◽  
Immature Stage ◽  
Juvenile Stage ◽  
Snow Crab ◽  
Sexual Character ◽  
Gonad Maturity ◽  
Chionoecetes Opilio ◽  
Juvenile Males ◽  
The Relationship ◽  
Determinant Factor

The relationship between chela height (CH) and carapace width (CW) of male snow crab, Chionoecetes opilio, goes through three allometric stages. The "immature stage" (mostly < 34 mm CW) evolves into a "juvenile stage" (34–120 mm CW) through a "juvenile molt" defining a change in allometry marked by an angular point around 34 mm CW. Fifty percent of males reach gonad maturity, defined by the presence of spermatophores inside the vasa deferentia, at an estimated size of 34 mm CW) The third allometric stage, "morphometrically mature," is separated from the juvenile stage by a "molt to morphometric maturity" at sizes ranging from 50 to 120 mm CW. Juvenile males have smaller claws than morphometrically mature males of the same size. This secondary sexual character is justified by a specific behavior of the males holding the pereipods of the female in one chela during precopulatory embrace. Male snow crab efficiently mate in nature with intermolt multiparous females only after reaching morphometric maturity. Therefore, the presence of spermatophores is not the sole determinant factor necessary for male copulation. Juvenile males larger than the minimum legal size of 95 mm CW are harvestable before, they may efficiently mate.

scholarly journals Analisis Aspek Reproduksi Kepiting Bakau (Scylla sp.) Di Perairan Kendal, Jawa Tengah

2019 ◽  
Vol 2 (1) ◽  
pp. 29-36
Author(s):  
Ester Tiurlan ◽  
Ali Djunaedi ◽  
Endang Supriyantini
Keyword(s):  
Gonad Index ◽  
Local Market ◽  
Marine Biota ◽  
Maturity Level ◽  
Chi Square ◽  
Spawning Period ◽  
Female Ratio ◽  
Male And Female ◽  
Central Java ◽  
Mangrove Crab

Kepiting bakau Scylla sp. merupakan salah satu biota laut yang mempunyai nilai ekonomis penting. Penyebarannya hampir di seluruh kawasan pesisir Indonesia, yang memiliki ekosistem mangrove termasuk di perairan Kendal. Banyaknya penangkapan kepiting bakau tanpa memperhatikan ukuran yang layak tangkap. Oleh karena itu penelitian ini dilakukan untuk memperoleh beberapa aspek reproduksi kepiting bakau Scylla sp. di perairan Kendal, Jawa Tengah. Pengambilan sampel dilakukan pada bulan Februari–Maret 2017, dua minggu sekali selama dua bulan di perairan Kendal, Jawa Tengah. Metode yang digunakan dalam penelitian ini adalah metode deskriptif eksploratif dengan parameter pendukung seperti suhu, salinitas, pH, dan DO. Materi yang digunakan adalah kepiting bakau Scylla sp. Analisis yang digunakan untuk menghitung perbandingan jumlah kepiting bakau jantan dan betina adalah uji chi square. Hasil penelitian menunjukkan bahwa komposisi ukuran kepiting bakau mempunyai lebar karapas 81-130 mm, berat 100-350 gram dengan ukuran rata-rata yang tertangkap 99,62 mm, perbandingan jantan dan betinanya 1:2,09. Hubungan lebar karapas dengan berat menunjukkan sifat allometrik positif. Faktor kondisi yang didapatkan adalah 1,0185. Tingkat kematangan gonad kepiting bakau di dominasi oleh TKG II, nilai indeks kematangan gonad pada kepiting bakau betina berkisar antara 6,84% - 18,49%. Tingkat kematangan gonad yang di dominasi oleh TKG II dikarenakan di lokasi penelitian tidak sedang masa pemijahan.   Mangrove crab (Scylla sp.) is one of the marine biota that it has value economically important. It spreads in almost all over coastal areas of Indonesia, which has the mangrove ecosystem. Mangrove crab has a high nutritional value. Thus, encouraging people in Kendal to consume a large amount of mangrove crab and reach the local market demand.This led to the occurrence of a lot of mangrove crab catching regardless of the size of the catch.Therefore, this study was conducted to obtain some of reproduction aspects of Scylla sp. in the Kendal waters, Central Java. Sampling was conducted in February-March 2017,every two weeks in two months in Kendal waters, Central Java. The method used in this research was descriptive explorative method with supporting parameters such as temperature, salinity, pH, and DO. The used material was mangrove crab (Scylla sp.). Chi square test was used to analyze and calculate the ratio of male and female mangrove crabs. The results showed that the size composition of mangrove crab had a carbide width of 71-130 mm, weight of 100-350 grams, with average size captured was 99.62 mm, male and female ratio of 1: 2.09. The Relations between width and weight of caparace indicated negative allometric properties. The obtained condition factor was 1.0184767. Maturity level of mangrove crab gonad was dominated by TKG II, gonad index maturity value on female mangrove crab ranged between 6.84% - 18.49%. The maturity level of gonad was dominated by TKG IIbecause the research location was not in the spawning period.

Is the Ratio of Male and Female Dream Characters Related to the Waking-Life Pattern of Social Contacts?

1998 ◽  
Vol 87 (2) ◽  
pp. 513-514 ◽  
Author(s):  
Michael Schredl ◽  
Tim Loßnitzer ◽  
Stefan Vetter
Keyword(s):  
Sex Ratio ◽  
Social Contacts ◽  
Male And Female ◽  
Dream Characters ◽  
Life Pattern ◽  
The Relationship

The present study investigated the relationship between the sex ratio of dream characters and the person's waking-life pattern of social contacts. Results partly confirm the continuity between waking and dreaming.

scholarly journals Aspek Biologi Ikan Layang (Decapterus russelli) di Perairan Latuhalat, Kecamatan Nusaniwe, Pulau Ambon

Omni-Akuatika ◽  
2016 ◽  
Vol 12 (3) ◽  
Author(s):  
Ong T.S Ongkers ◽  
Jesaja A Pattikawa ◽  
Frederick Rijoly
Keyword(s):  
Sex Ratio ◽  
Size Distribution ◽  
Growth Pattern ◽  
Sex Ratios ◽  
Purse Seine ◽  
Allometric Growth ◽  
Maturity Level ◽  
Gonad Maturity ◽  
Fish Samples ◽  
Biological Aspects

This research was carried out in the waters of Latulahalat, Ambon Island from June to August 2016. The objectives of the research were to study some biological aspects namely sex ratio, gonad maturity level, size distribution and growth pattern of scad mackerel, Decaterus russelli. Fish samples were collected every month at fish landing from purse seine fishers. Sex ratios of scad mackerel in the area were equal i.e. 1:1 with the male dominated gonad maturity levels I and IV while female dominated gonad maturity levels II, III and V.  In general, male fishes were smaller than female ones in term of length and weight. Scad mackerel in the area showed positive allometric growth except for male on August which showed isometric growth Keywords: Decaterus russelli, sex ratio, .gonad maturity level, growth pattern 

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