scholarly journals ASPEK REPRODUKSI IKAN WADER IJO (OSTHEOCHILUS HASSELTI) DI DANAU RAWAPENING AMBARAWA, KABUPATEN SEMARANG

2018 ◽  
Vol 6 (1) ◽  
pp. 77-86
Author(s):  
Muhammad Rizky Nugraha ◽  
Anhar Solichin ◽  
Boedi Hendrarto
Keyword(s):  
Sampling Method ◽  
Average Length ◽  
Gonadosomatic Index ◽  
Mesh Size ◽  
Chi Square ◽  
Gill Net ◽  
Level Ii ◽  
Mature Fish ◽  
First Maturity ◽  
Egg Diameter

ABSTRAK Ikan Wader Ijo (O. hasselti) merupakan ikan khas di Danau Rawapening.  Populasinya saat ini diduga mengalami penurunan, akibat penangkapan ikan Wader Ijo yang sedang bertelur dan penggunaan alat tangkap dengan mesh size kecil. Penelitian ini bertujuan untuk mengetahui aspek reproduksi ikan Wader Ijo, faktor lingkungan dan mesh size gill net yang aman digunakan. Penelitian yang dilakukan bersifat deskriptif, dengan teknik pengambilan sampel acak. Penelitian dilaksanakan Juli - Agustus 2016 di Danau Rawapening. Sampel diperoleh 93 ekor menggunakan gill net mesh size 2 inchi, dengan panjang total 111 – 210 mm. Nisbah kelamin 1:6,75 dengan dominasi ikan betina. Sampel didominasi ikan matang gonad pada TKG IV. Berdasarkan analisa PCA, Ikan Wader Ijo pada TKG II, III dan IV memiliki korelasi negatif dengan pH, arus dan oksigen terlarut. Angka Indeks Kematangan Gonad tertinggi betina diperoleh 30,30%, sedangkan jantan 19,67%. Ikan Wader Ijo yang tertangkap belum mengalami recruitment overfishing karena ukuran ikan pertama kali matang gonad jantan 100,63 mm dan betina 110,90 mm lebih kecil dari ukuran rata-rata yang tertangkap153 mm. Fekunditas diperoleh 80.862 – 19.880 butir/individu. Berdasarkan analisa Regresi Power, fekunditas Wader Ijo dipengaruhi oleh panjang tubuhnya. Diameter telur yang diperoleh berkisar 0,01 – 1,01 mm. Berdasarkan analisa Chi-Square, bagian yang berbeda dalam ovarium memiliki hubungan dengan ukuran diameter telur. Mesh size gill net yang aman digunakan minimal berukuran 1,54 inchi. Kata Kunci : Wader Ijo; Aspek Reproduksi;  Rawapening ABSTRACT Bonylip Barb (O. hasselti) is a local fish in Rawapening lake which population of this species in Rawapening already decrease, because of exploitation spawning Bonylip Barb and the used of fishing gear with small mesh size. This research aimed to know reproduction aspects of Bonylip Barb, environmental factors and mesh size of gill net. The method used in this research was descriptive with random sampling method. A total of 93 specimens were collected by gill net mesh size 2 inch from July to August 2016 at Rawapening. Specimens have total lenght 111 – 210 mm. Sex ratio was 1 : 6,75 dominated by female. Gonadal stage dominated by mature fish on level IV. Based on PCA analysis, gonadal stage level II, III and IV have negative correlations with pH, current and dissolved oxygen. The highest Gonadosomatic Index on female was 30,30%, while the male one was 19,67%. Length of first maturity not only male 100,63 mm but also female 110,90 mm smaller than average length of capture 155 mm, it means that Bonylip Barb in Rawapening still safe from recruitment overfishing. Fecundity ranged from 80.862 to 19.880 granules/individual. Based on power regression, fecundity was determined by the total length. Egg diameter ranged from 0,1 to 1,01 mm. Based on Chi-Square, different path of ovary have a corelation  with  egg diameter. Mesh size gill net that used in Rawapening was not recommended under 1,54 inch. Keywords: Bonylip Barb, Reproduction Aspect, Rawapening 

Aspects of the fishery, maturation and net selectivity of the wedge sole (Dicologoglossa cuneata) off south-western Iberia: implications for fishery management

2009 ◽  
Vol 90 (7) ◽  
pp. 1465-1474 ◽  
Author(s):  
Miguel Neves Santos ◽  
Pedro Gil Lino
Keyword(s):  
Fishery Management ◽  
River Mouth ◽  
Mesh Size ◽  
Scientific Basis ◽  
Catch Per Unit Effort ◽  
Important Species ◽  
Gill Net ◽  
Catch Rates ◽  
Log Normal ◽  
First Maturity

The wedge sole (Dicologoglossa cuneata, Moreau 1881) is a commercially important species for the artisanal fleet operating off the south-western Iberian Peninsula. During 2004 and 2005 a study was undertaken aiming to provide a scientific basis for management. Data collection included information on aspects of the fishery, spawning season, size at first maturity, tangle and gill-net selectivity. Seven nominal mesh sizes were used (40, 45 and 50 mm tangle nets and 40, 50, 60 and 70 mm gill-nets). Spawning lasts from December to June, with peaks in March and May. Length at first maturity for females was estimated at 18.5 cm. Catch rates decreased sharply with increasing mesh size, with tangle nets providing the highest yields. The log-normal selectivity model provided the best fit for specimens that were wedged. The higher catch-per-unit-effort of the smaller mesh sizes and the modal length of the fitted selectivity curve being below the size-at-maturity for wedge sole, suggests that the 50 mm nominal mesh size tangle net is the most appropriate for ensuring the fishery sustainability. Nevertheless, the minimum legal size should increase to at least 18 cm and a time–area closure should be implemented off the Guadiana River mouth.

scholarly journals Reproductive Biology of Marine Catfish, Arius latiscutatus (Günther, 1864) and Arius gigas (Boulenger, 1911) from the Bays of Guinea

2020 ◽  
pp. 1-13
Author(s):  
Pierre Koivogui ◽  
Yao Aristide Konan ◽  
Bakari Coulibaly ◽  
Essetchi Paul Kouamelan ◽  
Tidiani Koné
Keyword(s):  
Reproductive Biology ◽  
Gonadosomatic Index ◽  
Gonadal Development ◽  
Cold Season ◽  
Oocyte Diameter ◽  
Chi Square ◽  
Coastal Fisheries ◽  
Republic Of Guinea ◽  
Macroscopic Observation ◽  
First Maturity

Background and Objectives: Marine catfish are abundant in the bays of Tabounsou and Sangareah in Republic of Guinea, but the knowledge on their biology is still scanty. The reproductive biology of Arius latiscutatus Günther, 1864 and A. gigas Boulenger, 1911 was studied through monthly sampling, from January to December 2016. Methodology: Fish were caught using gill nets in several sampling sites. Five gonadal stages were described, based on macroscopic observation of gonad form, size, weight, color and oocyte diameter. Results: The population was dominated by males (61%) in A. latiscutatus and females (53%) in A. gigas, showing a sex-ratio of 1:1.54 (Chi-square, P < 0.05) and 1:0.88 (P > 0.05), respectively. The length-weight relationship was a positive allometry for A. latiscutatus and A. gigas, and males (35.37 and 35.47 cm, respectively) reached first maturity earlier than females (39.7 and 40.8 cm, respectively). Changes in the gonadosomatic index (GSI) and in stages of gonadal development showed that A. latiscutatus spawned between April and October, while A. gigas spawned in May to November. The peak of condition factor was observed in June (0.68±0.05) and July (0.55±0.04) in females of A. latiscutatus and A. gigas, respectively. Conclusion: Both species, having only one annual breeding season, A. latiscutatus spawns earlier than A. gigas. Coastal fisheries should be restricted in cold season to preserve the ability of broodstock renewal for these species.

scholarly journals The Biological Aspect of Mackerel Scad (Decapterus Macarellus Cuvier, 1833) In Samudera Hindia (West Sumatera Block)

Omni-Akuatika ◽  
2020 ◽  
Vol 16 (3) ◽  
pp. 92
Author(s):  
Heri Widiyastuti ◽  
Andina Ramadhani Putri Pane ◽  
Moh Fauzi ◽  
Thomas Hidayat
Keyword(s):  
Indian Ocean ◽  
Sex Ratio ◽  
Average Length ◽  
Mesh Size ◽  
Growth Patterns ◽  
Purse Seine ◽  
West Sumatra ◽  
The Indian Ocean ◽  
Biological Aspects ◽  
First Maturity

Mackerel scad (Decapterus macarellus) is one of the important economical caught in the Indian Ocean West Sumatra waters captured using purse seine. Increased production of mackerel scad will lead to increased exploitation, causing population changes. Therefore, research was carried out to find out the biological aspects of the fish so that resource management can be done. The sampling was conducted in Lampulo, Sibolga, and Air Bangis from February to November 2016 with total samples of 716 fishes. This research was conduct to study some biological aspects which consist of size distribution, length-weight relationship, sex ratio, gonad maturity level, the length at first capture, and length of the first maturity in Indian ocean west Sumatera waters. The results showed that the size of the mackerel scad had ranged between 16 - 33.6 cm FL and the average was 24.5 cm. Growth patterns are allometric negative, sex ratio male and female in an unbalanced condition. The mackerel scad is most caught by purse seine in maturity condition. The average length at first captured was 25.08 cm FL and length at first mature was 20.47 cm FL. These were an ideal biological condition and must be maintained because it provides an opportunity for fish to increase the population. The mesh size purse must follow the Ministry of Maritime Affairs and Fisheries Regulation Number 71/2016 that adjusted for minimum at 1 inch. Keywords: Mackerel scad, Indian Ocean, purse seine

scholarly journals Reproductive Biology of Oci Fish Selaroides leptolepis in Tomini Bay

2020 ◽  
Vol 9 (4) ◽  
pp. 407-415
Author(s):  
Nuralim Pasisingi ◽  
Putri Sapira Ibrahim ◽  
Zulkifli Arsalam Moo ◽  
Munirah Tuli
Keyword(s):  
Reproductive Biology ◽  
Sampling Method ◽  
Average Length ◽  
Time Interval ◽  
Gonad Maturity ◽  
Length Range ◽  
Management Policies ◽  
Interval Sampling ◽  
First Maturity ◽  
Fisheries Biology

Local people name Selaroides leptolepis distributed in Tomini Bay as Oci Fish. A study of the fish reproductive biology, which is one aspect of fisheries biology, is crucial to support the implementation of sustainable Oci Fish resource management policies. This study aims to determine the average length at first maturity, gonad maturity stages, and fecundity of the fish in Tomini Bay. Sampling was carried out using a stratified random sampling method from the catches of the fishermen landed in Fish Landing Base Kampung Tenda, Gorontalo City. The time interval sampling was conducted per month during April, May, and June 2020. Fish and egg samples preserved using ice cubes and a 10% formaldehyde solution correspondingly. The results of the study showed that the Oci Fish in Tomini Bay had a length range of the first maturity between 166 and 174 mm with a gonad maturity index ranging from 1.773 to 2.760%. The average fish fecundity was 16623 ± 4850 eggs.

Conservation, Ecology, and Management of Catfish: The Second International Symposium

2011 ◽  
Keyword(s):  
Gulf Of California ◽  
Average Length ◽  
Gonad Development ◽  
Maturity Stage ◽  
Important Species ◽  
Conservation Ecology ◽  
Gill Net ◽  
Negative Effect ◽  
First Maturity ◽  
Fishing Practices

<em>Abstract</em>.—The chihuil sea catfish <em>Bagre panamensis </em>from the southeastern Gulf of California is an important species that is commercially exploited. Currently, the species is thought to have relatively high abundances. However, studies on biology of this species are scarce; therefore, harvest regulations do not exist for this species in Mexico. The aim of this work was to describe reproductive biology of this species as an initial basis for management of this resource, to assess if the current fishing practices could have an effect on its population, and finally, to begin promoting effective management of this population. Gill-net samples were carried out from October 2008 to October 2009. All fish were dissected; gender and gonad maturity stage were determined macroscopically. Results indicated that the spawning season runs from May to August and generally with synchronic gonad development. Fecundity of the chihuil sea catfish was 36, which is low because this species shows parental care via oral incubation of fry, reducing mortality. Estimated length at first maturity is 350 mm total length (TL). Average length at first catch from the artisanal gill-net fishery is 300 mm TL, indicating that this fishery is harvesting fish that have yet to have had a single reproductive event. A large number of captured fish consisted of males that were incubating fry, thus, likely causing large fry mortality. Current harvest practices may have a negative effect on the chihuil sea catfish population in the Gulf of California. A closed season is proposed for this species from May to August with a minimum harvest length of 400 mm TL.

scholarly journals The first data on the population parameters and morphometry of Mesogobius batrachocephalus (Pallas 1814) (Family: Gobiidae) in the southern Black Sea

2021 ◽  
Vol 4 (2) ◽  
pp. 116-128
Author(s):  
Mehmet Aydın
Keyword(s):  
Black Sea ◽  
Growth Parameters ◽  
Average Length ◽  
Gonadosomatic Index ◽  
Total Mortality ◽  
Mesh Size ◽  
The Black Sea ◽  
Population Parameters ◽  
The Caspian Sea ◽  
Female Ratio

Knout goby, Mesogobius batrachocephalus Pallas, 1814, which belongs to Gobiidae, inhabits in the Black Sea, Sea of Azov, the Caspian Sea and the rivers that flow in these three seas. The major population parameters and morphometry of Mesogobius batrachocephalus from the coasts of the southern Black Sea were investigated in this study. A total of 641 individuals were sampled between January 2019 and December 2019 between the depths of 2 to 120 m depth by using a trammel net with a mesh size of 17-24 mm. The average length and weight values were calculated as 23.1 cm (5.3-34.0) and 130.1 g (1.34-377.54) respectively. The male to female ratio of the population was found as 1:0.91 (P>0.05). Age of sampled 641 individuals varies between zero and seven. For all the sampled individuals, the von Bertalanffy growth parameters were calculated as; L∞ = 38.2 cm, k = 0.245 year-1 and t0 = -1.873 year and the length-weight relationship was found as W = 0.0058 TL3.148. Total mortality (0.481), natural mortality (0.466), fishing mortality (0.015), growth performance index (2.55) and condition factor (0.913) were calculated. The maximum value of gonadosomatic index was reached in March. Average relative fecundity was found to be 118.3 eggs per g (78.9-234.5), while the average diameter of the eggs was found as 2733.0 µm ±221.18 (2287.1-3097.8). This study provides the first data on the population parameters and the morphometry of Mesogobius batrachocephalus. These data could contribute to the establishment of a sustainable management plan for fisheries resources in the Black Sea.

scholarly journals The influence of population structure and reproductive aspects of the genus Stellifer (Oken, 1817) on the abundance of species on the southern Brazilian coast

2011 ◽  
Vol 71 (4) ◽  
pp. 991-1002 ◽  
Author(s):  
JL. Rodrigues-Filho ◽  
JR. Verani ◽  
AC. Peret ◽  
LM. Sabinson ◽  
JO. Branco
Keyword(s):  
Activity Index ◽  
Gonadosomatic Index ◽  
Reproductive Activity ◽  
Reproductive Period ◽  
Brazilian Coast ◽  
Effective Population ◽  
Chi Square ◽  
Chi Square Test ◽  
First Maturity ◽  
The Relationship

The differences between abundance and the relationship with aspects of population and reproductive Stellifer rastrifer, Stellifer stellifer and Stellifer brasiliensis were analysed. Data were collected monthly trawl directed for capture of seabob shrimp in Armação do Itapocoroy, an important fishing area on the southern Brazilian coast. The chi-square test showed that the population of S. rastrifer presented values of capture significantly higher than others in all evaluated periods. The frequency distribution of total length curves combined with records of the size at first maturity (L50) showed that S. rastrifer is a species with a majority of the adults effectively participating in the reproductive period. The frequency of occurrence of individuals in reproduction monthly examined together with changes in the gonadosomatic index (GSI) and the reproductive activity index indicated that spring was the main breeding season for the three species. However, it was observed that the reproductive period of S. rastrifer was more pronounced and more extensive than that of its congeners, apparently providing it with ecological advantages and enabling a more effective population balance given the pressure exerted by fishing in the study area.

Reproductive biology of the Egyptian sole, Solea aegyptiaca (Actinopterygii: Pleuronectiformes: Soleidae), in southern Tunisian waters (Central Mediterranean)

2018 ◽  
Vol 99 (4) ◽  
pp. 975-981
Author(s):  
Faten Khalifa ◽  
Aymen Hadj Taieb ◽  
Ferid Hajji ◽  
Habib Ayadi ◽  
Othman Jarboui
Keyword(s):  
Average Length ◽  
Gonadosomatic Index ◽  
Reproductive Season ◽  
Central Mediterranean ◽  
Size Classes ◽  
Total Fecundity ◽  
Reproduction Biology ◽  
Males And Females ◽  
First Maturity ◽  
Macroscopic Analysis

AbstractSolea aegyptiaca (Chabanaud, 1927) is one of the most common Soleid species in southern Tunisian waters. This study provides the first detailed information on the reproduction biology of S. aegyptiaca in these areas. Samples of S. aegyptiaca were collected by trawl from the Gulf of Gabes (Tunisia) between April 2013 and March 2015. A total of 1638 specimens were examined, ranging from 9.7 to 30.7 cm total length. The sex ratio was in favour of males in smaller size classes and females in larger size classes. The macroscopic analysis of the gonads and the progression of the monthly values of the gonadosomatic index (GSI) indicated that the reproductive season extended from October to February, with GSI peaking in November and December for males and females respectively, and that spawning occurs once a year from November to February. The utilization of lipid reserves, stored predominantly in the liver as well as in muscles, was depicted. The estimated average length at first maturity was 22.31 ± 0.41 cm for males and 23.19 ± 0.184 cm for females. Total fecundity of mature females ranged from 14,160–62,700 eggs per fish, showing a significant increase with size, with an average of 33,020 ± 5239 eggs per fish.

scholarly journals REPRODUCTIVE ASPECTS OF SCALLOPED PERCHLET, Ambassis nalua (HAMILTON, 1822) IN PABEAN BAY INDRAMAYU, WEST JAVA

2017 ◽  
Vol 9 (1) ◽  
pp. 113-124 ◽  
Author(s):  
Nisha Desfi Arianti ◽  
M.F. Rahardjo ◽  
Ahmad Zahid
Keyword(s):  
Sex Ratio ◽  
Sampling Period ◽  
Spawning Season ◽  
Diameter Distribution ◽  
Male And Female ◽  
Fish Samples ◽  
Males And Females ◽  
Mature Fish ◽  
First Maturity ◽  
Egg Diameter

ABSTRACTScalloped perchlet, Ambassis nalua,  is one of fishes in Pabean Bay, Indramayu. This research aims to determine the reproductive aspects of Ambassis nalua in Pabean Bay Indramayu including sex ratio, spawning season, first maturity, fecundity and spawning pattern. Fish samples were collected by trap net and trammel net at three sites in Pabean Bay from April to October 2015. A total of 424 of A. nalua were caught, consist of 114 males and 310 females; with total length ranged from 38.04 to 112.63 mm and total weight ranged from 0.37 to 25.44 g. Sex ratio of mature fish  was 1:1.9. The mature males and females were found in every month of sampling period. The gonado-somatic index (GSI) ranged from 0.40 to 0.83 and 2.36 to 4.54 for male and female, respectively. The peak of spawning season was found in September. The first maturity (Lm50) for male and female were 79.17 mm and 91.25 mm, respectively. The fecundity varied from 3,451–32,465 eggs. Egg diameter distribution shows that spawning pattern of A. nalua was batch spawner. Keywords: Ambassis nalua, spawning season, sex ratio, reproduction

scholarly journals Biology of reproduction in Otolithoides pama (Hamilton, 1822) in Hooghly-Matlah Estuary of West Bengal, India

2021 ◽  
Vol 68 (1) ◽  
Author(s):  
Dibakar Bhakta ◽  
Sudhir Kumar Das ◽  
B.K. Das ◽  
T.S. Nagesh
Keyword(s):  
Body Weight ◽  
West Bengal ◽  
Gonadosomatic Index ◽  
Reproductive Activity ◽  
Demersal Fish ◽  
Estuarine System ◽  
Ovary Weight ◽  
Total Length ◽  
First Maturity ◽  
Egg Diameter

Pama croaker, Otolithoides pama (Hamilton, 1822) is one of the commercially important demersal fish of Hooghly-Matlah estuarine system, West Bengal, India. Reproductive biology of 618 samples of O. pama (Hamilton, 1822) collected from the Hooghly-Matlah estuarine system of West Bengal, India for a period of 18 months (November 2016 to April 2018) was investigated. The total length (TL), body weight (BW) and ovary weight (OW) of the samples varied from 100-384 mm, 7.29-470.71 g and 1.5-29.49 g, respectively. The sex distribution was 1 male for 1.07 female and the ratio did not differ statistically. The length at first maturity (Lm) was recorded as 183 mm for males and 196 mm for females. The reproductive activity was found throughout the year with three peak spawning season with high gonadosomatic index (GSI) values, i. e., during February-March, June and September-November. The absolute fecundity ranged from 4652 to 170688 eggs (24950±32441.2) and relative fecundity ranged from 96 to 808 eggs per g body weight (382±176.83). Fecundity exhibited a relatively higher significant correlation with ovary weight (r = 0.973, p<0.01), compared to total length, total weight and ovary length. Egg diameter frequency showed polymodal distribution, indicating that the species is a batch or asynchronous spawner.

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