scholarly journals Komposisi Jenis Plankton Pada Musim Penangkapan Ikan Penja (Gobioidea sp) Di Muara Sungai Mandar

2020 ◽  
Vol 4 (1) ◽  
pp. 29-42
Author(s):  
Chichilia Qaila Azzahrah Rahman ◽  
Moh. Tauhid Umar ◽  
Nita Rukminasari ◽  
Sahabuddin Sahabuddin
Keyword(s):  
Diversity Index ◽  
Pelagic Fish ◽  
Sampling Time ◽  
Sampling Location ◽  
Small Pelagic Fish ◽  
Fishing Season ◽  
Long Time ◽  
Index Value ◽  
Biology Laboratory ◽  
Aquaculture Development

Penja is an endemic fish in the Mandar river and is one of the small pelagic fish species that has been used by fishermen in Polewali Mandar for a long time. Penja fish is one of the water organisms that utilize plankton as its food. This study aims to determine the composition of the plankton species the fishing season in Mandar waters of Polewali Mandar Regency, West Sulawesi Province. This research was conducted in November-December 2017. The sampling location was conducted in two different water locations which are at estuary and body of Mandar River, Polewali Mandar Regency, West Sulawesi Province. And the identification of samples was done at the Biology Laboratory of Plankton and Natural Feed at the Research Center for Brackishwater Aquaculture Development and Fisheries Extension (BRPBAP3) of Maros Regency. The results of this study indicate that the highest abundance of plankton during the fishing season in the estuary waters and the month of December. Bacillariophyceae class is the most plankton class found during the study and there is 37 genus plankton consisting of 28 genus of phytoplankton and 9 genus of zooplankton. The range of diversity index value during fishing time, sampling location, research month and sampling time are 1 <H '<3 which means medium diversity, uniformity index value is 0.7-0.9 so that the plankton uniformity index is relatively the same or equal, and the Domination index value indicates that no domain genus in the community.

scholarly journals Kepadatan Dan Persebaran Kepiting (Brachyura) Di Ekosistem Hutan Mangrove Segara Anakan Cilacap

2017 ◽  
Vol 20 (2) ◽  
pp. 131
Author(s):  
Sri Redjeki ◽  
Mas’ad Arif ◽  
Retno Hartati ◽  
Laras Kinanti Pinandita
Keyword(s):  
Diversity Index ◽  
Population Monitoring ◽  
Sampling Location ◽  
Nursery Ground ◽  
Mangrove Forests ◽  
Biological Index ◽  
Mangrove Ecosystems ◽  
Index Approach ◽  
Index Value ◽  
Abundance And Distribution

Segara Anakan area is a lagoon surrounded by mangrove forests and muddy land. Mangrove forests have an ecological function such as spawning ground, nursery ground, and feeding ground for various biota. The destruction of mangrove forests caused by human activities is quite alarming and affects the survival of living biota in it, one of them is crabs. Changes in the structure and composition of the crabs in mangrove ecosystems caused by habitat changes can be used as an indicator for water quality by biological index approach through population monitoring, community composition, or even the ecosystem function. So that, by the study of abundance and distribution of crabs on mangrove vegetation, the results can be used as monitoring of environmental conditions of mangrove ecosystems in Segara Anakan Area. This research was conducted to determine about the composition, abundance, diversity index, uniformity index, dominance index, and pattern of distribution of crabs on mangrove ecosystems in Segara Anakan, Cilacap. The sampling was conducted in July, 2016 in 3 locations namely Panikel, Bondan, and Kalibuntu. To determine the sampling location using random method of stratification. Crab sampling using 5m x 5m transect method in 3 stations with 3 repetitions at each station. The results of this research found 12 species consisting of 3 families of crabs. Ocypodidae Family is the most commonly crabs found in 3 location. The highest abundance of crab is in Kalibuntu (1,56 ind/m2) an the lowest abundance is in Panikel (1,27 ind/m2). There are two pattern of distribution of crabs in this research,  namely random and clumped. The diversity index values are in the medium category, whereas the uniformity index value is in the high category. In this research there is no dominance in all research location. Keywords : Crab, Mangrove, Abundance, Distribution, Structure of Community  Kawasan Segara Anakan merupakan laguna yang dikelilingi oleh hutan-rawa mangrove yang luas dan daratan berlumpur. Hutan mangrove memiliki fungsi ekologis antara lain sebagai tempat pemijahan, pembesaran, dan mencari makan bagi berbagai biota didalamnya. Kerusakan hutan mangrove yang terjadi karena adanya aktivitas manusia cukup mengkhawatirkan dan berpengaruh terhadap kelangsungan hidup biota yang hidup didalamnya, salah satunya adalah kepiting. Perubahan struktur dan komposisi kepiting pada ekosistem mangrove yang diakibatkan oleh adanya perubahan habitat dapat dijadikan indikator kualitas perairan dengan pendekatan indeks biologi melalui monitoring jumlah populasi, komposisi komunitas maupun fungsi ekosistemnya. Sehingga dengan dilakukannya kajian tentang Kepadatan dan Persebaran kepiting pada vegetasi mangrove hasilnya dapat digunakan sebagai monitoring kondisi lingkungan ekosistem mangrove di Kawasan Segara Anakan. Penelitian ini dilakukan untuk mengetahui komposisi, kepadatan, indeks keanekaragaman, keseragaman, dominansi, dan pola sebaran kepiting pada ekosistem mangrove di Segara Anakan Cilacap. Pengambilan sampel dilaksanakan pada bulan Juli 2016 di 3 lokasi yakni Desa Panikel, Bondan, dan Kalibuntu. Penentuan lokasi sampling dengan metode acak berstratifikasi Pengambilan sampel kepiting menggunakan metode transek 5m x 5m dengan jumlah stasiun sebanyak 3 dan 3 kali pengulangan pada setiap stasiunnya. Hasil penelitian ditemukan 12 jenis spesies yang terdiri dari 3 famili kepiting. Famili Ocypodidae paling banyak ditemukan pada 3 lokasi penelitian. Kepadatan kepiting tertinggi terdapat pada Lokasi Kalibuntu (1,56 ind./m2) dan terendah di Lokasi Panikel (1,27 ind/ m2). Terdapat dua pola sebaran kepiting di lokasi penelitian, yaitu acak dan mengelompok. Nilai Indeks Keanekaragaman masuk dalam kategori sedang, sedangkan nilai indeks keseragaman dalam kategori tinggi. Dalam penelitian ini tidak terdapat dominansi pada seluruh stasiun penelitian. Kata  Kunci :  Kepiting, Hutan Mangrove, Kepadatan, Persebaran, Struktur Komunitas 

scholarly journals ANALYSIS OF NITRATE, PHOSPHATE AND CONCENTRATION ABILITY OF DIATOM (Bacillariophyta) PLANKTONIK IN THE SUMATERA PROVINCE OF WEST NIRWANA BEACH

2020 ◽  
Vol 2 (1) ◽  
pp. 21-28
Author(s):  
Theresia Tampubolon ◽  
Irvina Nurrachmi ◽  
Syahril Nedi
Keyword(s):  
Marine Biology ◽  
Diversity Index ◽  
Research Area ◽  
Sampling Location ◽  
Sample Bottle ◽  
Lugol Solution ◽  
Relationship Of ◽  
Biology Laboratory ◽  
The Relationship

This research was conducted in August 2018 with the aim to determine the concentration of nitrate and phosphate in the waters of Nirwana Beach, find out the type and abundance of diatoms found in the waters of Nirwana Beach, and determine the relationship of nitrate and phosphate concentrations to diatoms in Nirwana Beach waters. Determination of sampling location using purposive sampling, namely by taking into account the conditions and conditions of the research area. Sampling of nitrate and phosphate using a sample bottle measuring 100 ml then given preservatives and diatom samples using a bucket and filtered with plankton net no.25 and preserved with 4% lugol solution as much as 3-4 drops and analysis was carried out at the Marine Chemistry and Marine Biology Laboratory , Faculty of Fisheries and Marine Affairs, University of Riau. The results showed nitrate concentration in Nirwana Beach waters ranging from 0.5 mg / l - 0.3 mg / l. And phosphate concentration in the waters of Nirwana Beach ranges from 0.19 mg / l - 0.08 mg / l. In the coastal waters of Nirvana there are 16 species of diatoms found. The highest abundance of diatom species from all species found was Cosconidiscus sp with an average of 4263 ind / l per station. While the lowest abundance of species is Melosira sp, Thalassionema sp, Neodelphinies sp, Rhizossolenia sp and Cocconeis sp with an average of 73.5 ind / l. Diatom diversity index (H ') in Nirwana Beach waters is classified as moderate and community stability is categorized as moderate, there is no type that dominates the uniformity index (E) Nirwana Beach waters are still balanced and there is no competition for food or places. and phosphate with an abundance of diatoms which in this case means that the higher the concentration of nitrate and phosphate, the more abundance of diatoms.

scholarly journals Characteristics of purse seine fisheries in the Sulawesi Sea (case study in Tumumpa fishing port)

2021 ◽  
Vol 919 (1) ◽  
pp. 012016
Author(s):  
Baihaqi ◽  
Mahiswara ◽  
T W Budiarti
Keyword(s):  
Data Collection ◽  
Fork Length ◽  
Pelagic Fish ◽  
Purse Seine ◽  
Fishing Gear ◽  
Small Pelagic Fish ◽  
Fishing Season ◽  
Fish Resources ◽  
Pelagic Fishing

Abstract The purse seine is the dominant fishing gear operating at the Tumumpa Fishing Port with a vessel of >90%. The purse seines that have developed are large pelagic targets, with the main catch targets being skipjack, mackerel tuna, and tuna. Tuna, mackerel tuna and skipjack are important commodities for fisheries in Indonesia. This study aims to determine the characteristics of purse seine fishing gear and its catch in the Sulawesi Sea. Data collection was carried out for two years from 2019-2020 at Tumumpa Fishery Port. Indications for the use of fish resources are calculated by comparing the length-at-first-capture (Lc) with the length-at-first-mature (Lm). The results showed that purse seines are very dominant in exploiting large pelagic resources (skipjack, mackerel tuna and tuna) with the proportion reaching 78%, small pelagic (21% scads and 1% other fish). The large pelagic fishing season using the purse seine vessel occurs in May – November, with 2 peak seasons in July and September. While the small pelagic occurs in May – September, with the peak occurring in July. The size when the frigate tuna was first caught was at a fork length of 25.15 cm (Lc) and Lm in a size of 28.52 cm for females and 28.29 cm for males. Meanwhile, the first scads was caught (Lc) at a length of 21.4 cm with the length-at-first-mature (Lm) being 20 cm for the female and 19 cm for the male. Based on this analysis, it was shown that the purse seines is a selective fishing gear for small pelagic fish but not selective for large pelagic fish.

scholarly journals Fluktuasi hasil tangkapan mini purse seine yang didaratkan di Pelabuhan Samudra Bitung (Catch fluctuations of mini purse seine landed in Oceanic Fisheries Port, Bitung)

2018 ◽  
Vol 2 (6) ◽  
Author(s):  
Sunarto Sunarto ◽  
Isrojaty Johanes Paransa ◽  
Alfred Luasunaung
Keyword(s):  
Pelagic Fish ◽  
Bony Fish ◽  
Purse Seine ◽  
Catch Per Unit Effort ◽  
Small Pelagic Fish ◽  
Fishing Season ◽  
Unit Effort ◽  
Catch Composition ◽  
Descriptive Method

Fish catches landed in the Oceanis Fisheries Port (OFP), Bitung, are mackerel (Decapterus sp), ray finned bony fish (Euthynus sp), yellowstripe scad (Selaroides sp), and mackerel (Rastrelliger sp). This study used descriptive method and aimed to know the composition and the fluctuation of mini purse seine catches landed in OFP Bitung, to know the catch per unit effort (CPUE), and to analyze the fishing season.  Catch composition in 2012-2016 consisted of Euthynnus spp. (37.30%), Decapterus sp. (27.59%), Selaroides sp. (25.89%), and Rastrelliger sp. (9.22%). The highest total number of catch occurred in 2014 (650.29 tons), then in 2015 (509. 91 ton), and 2016 (338.31 tons). The highest CPUE was recorded in 2012 and 2013, in November and August, respectively. In 2014, the highest occurred in September then December. In 2015, the highest was found in  January then March. In 2016, the highest was recorded in June than October and November. Fishing season in 2012 and 2013 occurred in October and August; In 2014, the highest was in September then December; in 2015, the highest occurred in January, and in 2016, the highest was in June.Keywords; mini purse seine, small pelagic fish, CPUE, fishing season ABSTRAK Hasil tangkapan yang di daratkan di Pelabuhan Perikanan Samudra (PPS) Bitung , adalah ikan layang (Decapterus sp), ikan tongkol (Euthynus sp), ikan selar (Selaroides sp), dan ikan kembung (Rastrelliger sp). Penelitian menggunakan metoda deskriptif, bertujuan mengetahui komposisi dan fluktuasi jumlah tangkapan mini purse seine yang didaratkan di PPS Bitung, mengetahui tingkat upaya penangkapan dengan mini purse seine, menganalisis musim penangkapan ikan dengan mini purse seine yang didaratkan di PPS Bitung.  Komposisi jumlah tangkapan mini purse seine rata-rata Tahun 2012 - 2016 terdiri ikan tongkol (37,30%); ikan layang (27,59%), ikan selar (25,89%) dan ikan kembung (9,22%). Total jumlah tangkapan tertinggi terjadi pada Tahun 2014 (650,29 ton), kemudian Tahun 2015 (509, 91 ton) dan Tahun 2016 (338,31 ton).  tingkat upaya penangkapan ikan (CPUE) dengan mini purse seine Tahun 2012 dan 2013, tertinggi pada bulan November kemudian Agustus; Tahun 2014 tertinggi bulan September kemudian Desember; Tahun 2015 tertinggi bulan Januari kemudian Maret; Tahun 2016 tertinggi bulan Juni kemudian Oktober dan November. Musim penangkapan ikan dengan mini purse seine Tahun 2012 dan 2013 terjadi pada bulan Oktober dan Agustus; Tahun 2014 tertinggi bulan September kemudian Desember; Tahun 2015 tertinggi bulan Januari dan Tahun 2016 tertinggi di bulan Juni.Kata-kata kunci, mini purse seine, pelagis kecil, CPUE, musim penangkapan

scholarly journals Makrozoobenthos Gastropoda pada Vegetasi Mangrove di Pesisir Utara, Semarang

2019 ◽  
Vol 8 (1) ◽  
pp. 37
Author(s):  
Haryo Farras Raditya Hutama ◽  
Retno Hartati ◽  
Ali Djunaedi
Keyword(s):  
Community Structure ◽  
Sampling Method ◽  
Diversity Index ◽  
Secondary Data ◽  
Mangrove Ecosystem ◽  
Sampling Location ◽  
Research Station ◽  
Purposive Sampling ◽  
Data Density ◽  
Index Value

Kerusakan hutan mangrove yang terjadi karena adanya aktivitas manusia cukup mengkhawatirkan dan berpengaruh terhadap kelangsungan hidup biota yang hidup didalamnya, salah satunya adalah Gastropoda. Penelitian ini dilakukan untuk mengetahui komposisi jenis makrozoobenthos gastropoda  dan menganalisa struktur komunitasnya. Pengambilan sampel dilaksanakan pada bulan Maret 2015 di 4 lokasi yakni Mangunharjo, Mangkang Wetan, Pantai Maron dan Trimulyo, Semarang. Penentuan lokasi sampling dengan metode purposive sampling method terbagi dari kelebatan mangrove lebat, sedang dan jarang pada setiap lokasi penelitian dengan pertimbangan pengaruh aliran sungai terhadap parameter disetiap stasiunnya.Klasifikasi kelebatan mangrove berdasarkan data sekunder kerapatan mangrove Pesisir Utara Semarang 2015. Pengambilan sampel gastropoda menggunakan metode kualitatif dengan transek 5m x 5m dan 1m x 1m dengan jumlah stasiun sebanyak 8 dan 3 kali pengulangan pada setiap stasiunnya. Hasil penelitian ditemukan 8 jenis spesies yang terdiri dari 4 famili yang berbeda.Famili Potamididae paling banyak ditemukan dengan jumlah 4 spesies. Ditemukan satu spesies Famili Neriitidae yakni Nerita sp. serta satu spesies Famili Ellobiidae yakni Cassidula sp.. Kelimpahan tertinggi terdapat pada Stasiun MR1 (25.667 ind./75m2) dan terendah distasiun MW3 (0.107 ind./75m2). Nilai Indeks Keanekaragaman masuk dalam kategori sedang, sedangkan nilai indeks keseragaman dalam kategori tinggi.Dalam penelitian ini menemukan spesies yang mendominasi pada 2 stasiun yaitu Stasiun MW1 dan MR1. The damage of the mangrove ecosystem which occur due to human activity is quite alarming and effect on the survival of biota that lived in it, one which is Gastropods. This research was conducted to find out the composition of macrozoobenthos gastropods and analyze its community structure. Sampling did on March 2015 at 4 locations, i.e., Mangunharjo, Mangkang Wetan, Maron and Trimulyo, Semarang. This study was conducted to determine and identify the community structure of gastropod macrozoobenthos in mangrove vegetation on the coast of Semarang The determination of sampling location use purposive sampling method that divide the dense mangrove luxuriance, moderate and rarely at location research. The dense mangrove classification based on secondary data from the landsat image of 8 and the data density of mangrove North Coastal Semarang 2015. Sampling use qualitative method with 5 m x 5 m transects and 12 stations with three-time repetitions for each stations. The results found gastropods 8 types of species comprising in 4 different families. Potamididae family is the most dominant where found 4 species. One species of Neriitidae family is found which Nerita sp. and one species of the Ellobidae family is also found, which Cassidula sp.. The highest abundance was found on Station MR1 (25.667 ind./75m2) and the lowest in station MW3 (0.107 ind./75m2). The value of the Diversity Index can be category as average while the Equitability Index value is high. In this study, found there is 2 dominance species on the whole research station, one at MW1 and the other at MR1.

The box-balance model: a new tool to assess fish larval survival, applied to field data on two small pelagic fish

2020 ◽  
Vol 650 ◽  
pp. 289-308 ◽  
Author(s):  
V Raya ◽  
J Salat ◽  
A Sabatés
Keyword(s):  
Field Data ◽  
Fish Larvae ◽  
Larval Growth ◽  
Warming Trend ◽  
Mortality Rates ◽  
Larval Survival ◽  
Pelagic Fish ◽  
Balance Model ◽  
Small Pelagic Fish ◽  
Mesoscale Structures

This work develops a new method, the box-balance model (BBM), to assess the role of hydrodynamic structures in the survival of fish larvae. The BBM was applied in the northwest Mediterranean to field data, on 2 small pelagic fish species whose larvae coexist in summer: Engraulis encrasicolus, a dominant species, and Sardinella aurita, which is expanding northwards in relation to sea warming. The BBM allows one to quantify the contribution of circulation, with significant mesoscale activity, to the survival of fish larvae, clearly separating the effect of transport from biological factors. It is based on comparing the larval abundances at age found in local target areas, associated with the mesoscale structures (boxes), to those predicted by the overall mortality rate of the population in the region. The application of the BBM reveals that dispersion/retention by hydrodynamic structures favours the survival of E. encrasicolus larvae. In addition, since larval growth and mortality rates of the species are required parameters for application of the BBM, we present their estimates for S. aurita in the region for the first time. Although growth and mortality rates found for S. aurita are both higher than for E. encrasicolus, their combined effect confers a lower survival to S. aurita larvae. Thus, although the warming trend in the region would contribute to the expansion of the fast-growing species S. aurita, we can confirm that E. encrasicolus is well established, with a better adapted survival strategy.

Small pelagic fish responses to fine-scale oceanographic conditions: implications for the endangered African penguin

2017 ◽  
Vol 569 ◽  
pp. 187-203 ◽  
Author(s):  
AM McInnes ◽  
PG Ryan ◽  
M Lacerda ◽  
J Deshayes ◽  
WS Goschen ◽  
...  
Keyword(s):  
Pelagic Fish ◽  
Fine Scale ◽  
Small Pelagic Fish ◽  
African Penguin ◽  
Oceanographic Conditions

PEMETAAN RANTAI NILAI IKAN PELAGIS KECIL DI KOTA AMBON

2018 ◽  
Vol 2 (1) ◽  
pp. 15-21
Author(s):  
Yolanda MTN Apituley ◽  
Dionisius Bawole ◽  
Imelda KE Savitri ◽  
Friesland Tuapettel
Keyword(s):  
Value Chain ◽  
Secondary Data ◽  
Pelagic Fish ◽  
Value Chain Analysis ◽  
Small Pelagic Fish ◽  
Fresh Fish ◽  
Chain Analysis ◽  
The Government ◽  
Market Distance ◽  
Role Of The Government

This research was taken in Ambon (Latuhalat and Laha) and in Central Maluku Regency (Waai) in May – July 2018. It was aimed at mapping the value chain of small pelagic fish in Ambon through: 1) mapping of product, financial and information flows and 2). analysis of percentage distribution of small pelagic fish caught. The data used in this study was primary and secondary data, and analyzed by using value chain analysis. The results show that small pelagic fish marketing chain in Ambon consisted of six models with five actors. Each chain is formed due to the conditions and situation of market, resulted by the influencing of catches of fishermen and traders' capital. The broker plays an important role in marketing small pelagic fish in the market and obtaining 10% of the fishermen's catch that can be distributed, both to retailers and cold storage. Fish caught by the fishermen is still fresh in general when arrives in the consumers, because the fishing area is not too far, the market distance with the production centers is also quite close and in general fishermen and traders have understood the importance of maintaining product quality. Even so, the role of the Government in providing marketing facilities and infrastructure is needed so that modern market conditions can be applied in marketing fresh fish in Ambon.

A new look on the morphometric characteristics of Congridae leptocephali from the southern Adriatic Sea

2021 ◽  
pp. 1-5
Author(s):  
M. Mandić ◽  
I. Leonori ◽  
A. De Felice ◽  
S. Gvozdenović ◽  
A. Pešić
Keyword(s):  
Fish Species ◽  
Adriatic Sea ◽  
Pelagic Fish ◽  
Morphometric Parameters ◽  
Morphological Features ◽  
Morphometric Characteristics ◽  
Small Pelagic Fish ◽  
Acoustic Surveys ◽  
Western Side ◽  
Conger Conger

Abstract Anguillid leptocephali of three Congridae species (Conger conger, Ariosoma balearicum and Gnathophis mistax) were caught as bycatch of pelagic trawls during acoustic surveys targeting small pelagic fish species in the southern Adriatic Sea, carried out under the framework of the Italian MEDIAS project (western side) and its extension in the ambit of the FAO AdriaMed project (eastern side). Results refer to the findings of Congridae leptocephali during surveys conducted in 2011, 2014, 2015 and 2016. A total of 25 specimens were caught and analysed (morphological features and pigmentation patterns). Leptocephali of Conger conger were found in the range of 8.4–13.1 cm total length (TL) (between 50 and 132 m depth), Ariosoma balearicum from 9.7–12.2 cm TL (between 50 and 128 m depth) and for Gnathophis mystax in the range from 6.4–11.7 cm TL (between 40 and 79 m depth). The results indicate that the southern Adriatic Pit could be the spawning area of these species in the Adriatic Sea. Present data represent a contribution to existing knowledge about the ecology of leptocephali from the Congridae family in the southern Adriatic Sea, and also indicate the existence of differences in morphometric parameters between different areas, that is, the possibility of the existence of new geographic lines within the genus Ariosoma in the Adriatic Sea.

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