scholarly journals Komposisi Larva Ikan Pada Tutupan Padang Lamun di Perairan Prawean Bandengan, Kabupaten Jepara

2019 ◽  
Vol 8 (2) ◽  
pp. 96
Author(s):  
Sri Redjeki ◽  
Riska Novianti Putri ◽  
Adi Santoso ◽  
Sunaryo Sunaryo ◽  
Sri Sedjati
Keyword(s):  
Environmental Changes ◽  
Fish Larvae ◽  
Diversity Index ◽  
Mesh Size ◽  
Sampling Location ◽  
Seagrass Beds ◽  
Purposive Sampling ◽  
Distribution Index ◽  
Seagrass Ecosystems ◽  
Distribution Of Fish

Larva Ikan (ichtyoplankton) merupakan tahapan awal dari daur hidup ikan dimulai dari perkembangan telur, larva dan juvenil, memiliki tingkat mortalitas tinggi dan peka terhadap perubahan lingkungan, predator, dan kesediaan makanan. Fungsi ekologis padang lamun sebagai daerah asuhan dan tempat berlindung bagi semua jenis organisme laut kecil, salah satunya larva ikan. Kerapatan atau tutupan padang lamun juga sebagai salah satu faktor pendukung melimpahnya organisme dan kekayaan di laut. Tujuan Penelitian ini untuk mengetahui kelimpahan dan distribusi larva ikan yang terdapat pada ekosistem padang lamun, serta mengetahui hubungan kelimpahan larva ikan dengan tutupan padang lamun di Perairan Prawean Bandengan, Jepara. Metode penelitian ini adalah metode deskriptif dengan penentuan lokasi sampling menggunakan  purposive sampling methode. Lokasi penelitian pada 3 stasiun dengan pembagian kerapatan lamun yang berbeda (I = Padat ; II = Sedang ; III = Jarang) dan dilakukan sebanyak 3 kali pengulangan sampling di masing-masing lokasi. Pengambilan sampel larva ikan dilakukan dengan menggunakan larva net  (P = 0,9 m ; L : 0,6m) dengan ukuran mata jaring 800 µm. Hasil penelitian ini ditemukan larva ikan sebanyak 5 famili yaitu Nemipteridae, Gerreidae, Gobiidae, Labridae, dan Mullidae. Famili larva ikan yang paling sering ditemukan adalah Nemipteridae. Rata-rata kelimpahan famili larva ikan pada Stasiun I sebesar 0,419 ind/m3, Stasiun II sebesar 0,205 ind/m3, dan pada stasiun III sebesar 0,069 ind/m3. Nilai rata - rata indeks keanekaragaman termasuk dalam kategori rendah sedang (0,65–1,37), indeks keseragaman larva ikan termasuk dalam kategori rendah-tinggi (0,33-0,65) indeks dominasi larva ikan menunjukan ada yang mendominasi pada tiga stasiun (0,28–0,30) dan indeks sebaran morisita yang dilakukan menunjukan bahwa sebaran larva ikan pada tiga stasiun merata. Fish larvae (ichtyoplankton) are the initial stages of the fish's life cycle starting from the development of eggs, larvae and juveniles, which have a high mortality rate and are sensitive to environmental changes, predators, and food availability. The ecological function of seagrass beds as nurseries and shelter for all types of small marine organisms, one of which is fish larvae. The density or cover of seagrass beds is also one of the supporting factors for the abundance of organisms and wealth in the sea. The purpose of this study was to determine the abundance and distribution of fish larvae found in the seagrass ecosystems, and to determine the relationship of abundance of fish larvae with cover seagrass beds in the waters of Prawean Bandengan, Jepara. This research method is a descriptive method by determining the sampling location using purposive sampling method. The research location was in 3 stations with a different distribution of seagrass density (I = Dense; II = Medium; III = Rare) and carried out 3 times repetition of sampling at each location. Sampling of fish larvae was carried out using larvae net (P = 0,9 m; L: 0,6m) with a mesh size of 800 μm. The results of this reasearch, found fish larvae of 5 families, namely Nemipteridae, Gerreidae, Gobiidae, Labridae, and Mullidae. The most common family of fish larvae was Nemipteridae. The average abundance of fish larvae at Station I was 0,419 ind/m3, Station II was 0,205 ind/m3, and at Station III was 0,069 ind/m3. The average diversity index was included in the low category (0,65 – 1,37), the uniformity index of fish larvae was included in the low-high category (0,33 – 0,65) the fish larvae dominance index shows that there are dominating at three stations (0,28 – 0,30) and the distribution index of distribution (morisita) conducted showed that the distribution of fish larvae at three stations was evenly distributed.

Seagrass Ecosystems of Andaman and Nicobar Islands: Status and Future Perspective

2020 ◽  
Vol 7 (4) ◽  
pp. 169-174
Author(s):  
Chatragadda Ramesh ◽  
Raju Mohanraju
Keyword(s):  
Water Quality ◽  
Primary Production ◽  
Environmental Changes ◽  
Future Perspective ◽  
Marine Biodiversity ◽  
Seagrass Beds ◽  
Seagrass Meadows ◽  
Seagrass Ecosystem ◽  
Seagrass Ecosystems ◽  
Nicobar Islands

Seagrasses are unique marine flowering plants that play an important ecological role by yielding primary production and carbon sequestration to the marine environment. Seagrass ecosystems are rich in organic matter, supporting the growth of bio-medically important epi and endophytic microorganisms and harbor rich marine biodiversity. They are an essential food source for endangered Andaman state animal Dugongs. Seagrasses are very sensitive to water quality changes, and therefore they serve as ecological bio-indicators for environmental changes. The benthic components in and around the seagrass beds support a significant food chain for other Micro and organisms apart from fishery resources. The epiphytic bacterial communities of the leaf blades support the sustenance against the diseases. Recent reports have shown that the loss of seagrass beds in tropical and temperate regions emphasizes the depletion of these resources, and proper management of seagrass is urgent. The decline of seagrass will impact primary production, biodiversity, and adjacent ecosystems, such as reefs. Therefore, restoring the seagrass meadows could be possible with effective implementing management programs, including seagrass meadows in marine protected areas, restoration projects, seagrass transplantation, implementation of legislative rules, monitoring coastal water quality and human activities in the coastal zone. Lacunas on the seagrass ecosystem management in Andaman & Nicobar Islands are addressed.

A Coupled Asymmetrical Multiple Opening Closing Net with Environmental Sampling System

2005 ◽  
Vol 39 (2) ◽  
pp. 22-24 ◽  
Author(s):  
Cedric M. Guigand ◽  
Robert K. Cowen ◽  
Joel K. Llopiz ◽  
David E. Richardson
Keyword(s):  
Fish Larvae ◽  
Mesh Size ◽  
Weather Conditions ◽  
Early Life History ◽  
Sampling System ◽  
Larval Fishes ◽  
Large Samples ◽  
Sensing System ◽  
History Of ◽  
Distribution Of Fish

Recruitment levels of fishes are potentially related to the abundance of larval fishes and their food source. A system that could allow for the concurrent investigation of fine-scale distribution of fish larvae and their potential prey could add significantly to the understanding of the early life history of marine fishes. A coupled Multiple Opening Closing Net and Environmental Sensing System (MOCNESS) that combines two sub-systems (1 m2 and 4 m2 net sets) working in synchronization was designed to answer these questions. The mesh size was different on each set of nets allowing the collection of a broad size range of organisms while optimizing the catch of larger fish larvae and eliminating unnecessary large samples of zooplankton. Moreover, the system eliminated the need to deploy separate MOCNESS using different mesh sizes, thus reducing ship time costs, and avoiding any aliasing associated with trying to sample the same water mass with separate nets fished sequentially. The system has been used at sea under varying weather conditions onboard the R/V F. G. Walton Smith and sampled adequately.

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.

scholarly journals HUBUNGAN KERAPATAN LAMUN DENGAN KELIMPAHAN LARVA IKAN DI PULAU PRAMUKA, KEPULAUAN SERIBU JAKARTA

2016 ◽  
Vol 5 (3) ◽  
pp. 111-118
Author(s):  
Saraswati Saraswati ◽  
Agus Hartoko ◽  
Sasanti Retno Suharti
Keyword(s):  
Sampling Method ◽  
Fish Larvae ◽  
Survey Method ◽  
Nursery Ground ◽  
Aquatic Biota ◽  
Ecological Functions ◽  
Purposive Sampling ◽  
Close Relationship ◽  
Seagrass Ecosystems ◽  
Seagrass Density

ABSTRAKStadia larva merupakan fase awal daur kehidupan bagi ikan. Larva adalah biota perairan yang bersifat planktonik dan termasuk kedalam jenis meroplankton. Ekosistem Padang Lamun di Pulau Pramuka memiliki fungsi ekologis yang cukup penting di wilayah pesisir, dimana ekosistem ini merupakan salah satu daerah asuhan dan daerah mencari makan bagi larva ikan. Adanya perbedaan tingkat kerapatan lamun dan keberadaan makanan dapat memberikan pengaruh terhadap kelimpahan larva ikan. Sehingga hal tersebut menjadi landasan dilakukannya penelitian mengenai Hubungan Kerapatan Lamun Terhadap Kelimpahan Larva Ikan di Pulau Pramuka, Kepulauan Seribu Jakarta. Penelitian ini bertujuan untuk mengetahui kelimpahan larva ikan pada kerapatan lamun yang berbeda dan mengetahui pengaruh kerapatan lamun terhadap kelimpahan larva ikan. Metode yang digunakan adalah metode survei dengan penentuan titik sampling menggunakan metode purposive sampling. Hasil yang diperoleh adalah pada stasiun I tingkat kerapatan lamun padat (34156 individu/100m2) nilai kelimpahan larva ikan sebesar 756 individu/200m2 terdiri dari 8 famili. Stasiun II kerapatan sedang (26410 individu/100m2) nilai kelimpahan larva ikan yaitu 579 individu/200m2 terdiri dari 6 famili, dan stasiun III ketapatan jarang (6321 individu/100m2) nilai kelimpahan larva ikan sebesar 426 individu/200m2 yang terdiri dari 4 famili. Nilai korelasi antara kelimpahan larva ikan dengan kerapatan lamun yaitu sebesar r = 0,772. Berdasarkan hal tersebut dapat disimpulkan bahwa terdapat hubungan yang erat antara kelimpahan dan komposisi famili larva ikan dengan kerapatan lamun. Semakin tinggi nilai kerapatan lamun maka semakin tinggi pula nilai kelimpahan dan komposisi famili larva ikan. Begitu pula semakin rendah nilai kerapatan lamun maka nilai kelimpahan dan komposisi larva ikan juga semakin rendah. Kata Kunci : Kerapatan Lamun; Larva Ikan; Kelimpahan; Pulau Pramuka ABSTRACTLarval stage is the early phase of the life cycle for the fish. The larvae are aquatic biota that are planktonic and included into the type meroplankton. Seagrass ecosystems in Pramuka Island, has important ecological functions in coastal areas, where the ecosystem is one of the nursery ground and feeding ground for fish larvae. The big difference the density of seagrass and the presence of food can influence abundance of fish larvae. Thus, it will be the base for doing this research on The relations between Seagrass Density and Fish Larvae Abundance in Pramuka, Seribu Island Jakarta. This research aims to determine the abundance of fish larvae in different seagrass densities and determine the influence of the seagrass density on the abundance of fish larvae. The method used is survey method in determining the point of sampling using purposive sampling method. The results obtained are at station I the densities in dense seagrass (34156 individuals/100m2) abundance of fish larvae value at 756 individuals/200m2 consisting of eight families. Station II medium density (26410 individuals/100m2) the value of the abundance of fish larvae is 579 individuals/200m2 consisting of 6 families, and station III precision rarely (6321 individuals/100m2) the value of fish larvae abundance at 426 individuals/200m2 consisting of 4 families. The correlation values between the abundance of fish larvae with the density of seagrass in the amount of r = 0,772. Based on the above, we can conclude that there is a close relationship between the abundance and composition of fish larvae families with seagrass density. The higher the density of seagrass, the higher the families abundance and composition of fish larvae. Similarly, the lower the density value then the value of seagrass abundance and composition of fish larvae are also lower. Keywords: Sea Grass Density; Fish Larvae; Abundance; Pramuka Island.

scholarly journals Komposisi Larva Ikan pada Ekosistem Lamun di Perairan Jepara Jawa Tengah

2021 ◽  
Vol 10 (1) ◽  
pp. 7-13
Author(s):  
Muhamad Ravian Wiraputra ◽  
Suryono Suryono ◽  
Hadi Endrawati
Keyword(s):  
Fish Larvae ◽  
Diversity Index ◽  
Purposive Sampling ◽  
Eye Size ◽  
Seagrass Ecosystem ◽  
The Family ◽  
Early Growth Phase ◽  
The Relationship ◽  
Descriptive Method

Larva merupakan fase pertumbuhan awal pada ikan, pada fase tersebut ikan-ikan membutuhkan tempat untuk berlindung dan mencari makanan. Ekosistem lamun sangat mendukung keberlangsungan hidup ikan, fungsi ekologis lamun sebagai daerah memijah, daerah asuhan serta tempat mencari makan bagi ikan. Tujuan penelitian ini untuk mengetahui kehadiran, serta mengetahui hubungan antara kelimpahan larva ikan dan lamun di Perairan Prawean dan Blebak, Kabupaten Jepara. Metode yang digunakan dalam penelitian ini adalah metode deskriptif dan penentuan lokasi sampling menggunakan purposive sampling methode. Penelitian ini dilakukan pada dua lokasi yang berbeda dengan masing-masing lokasi memiliki 2 stasiun, pada setiap stasiun memiliki 3 stasiun. Pengambilan sampel larva ikan dilakukan dengan menggunakan larva net (P = 0,9 m; L : 0,6 m) dengan ukuran mata jaring 800 µm. Sampel yang didapat kemudian disortir dan diidentifikasi menggunakan literatur. Hasil penelitian ini ditemukan Nemipteridae, Lutjanidae, Ambassidae, Sphyraenidae, Bothidae, Clupeidae, Chanidae, Monacanthidae. Famili larva ikan yang dominan adalah Nemipteridae. Nilai indeks keanekaragaman dari empat stasiun termasuk dalam kategori rendah-sedang (0,92 - 1,50). Nilai indeks keanekaragaman dari empat stasiun termasuk dalam kategori sedang-tinggi (0,61 - 1,00). Kisaran nilai indeks dominasi larva ikan dari empat stasiun menunjukan tidak adanya famili yang mendominasi (0,23 - 0,54). Larvae are an early growth phase in fish, in that phase fish need a place to take shelter and find food. Seagrass ecosystem strongly supports the survival of fish, the ecological functions of seagrass as a clusters area, an area of care and a place to eat for fish. The purpose of this research is to know the presence, and know the relationship between the abundance of fish larvae and seagrass in Prawean waters and Blebak, Jepara regency. The method used in this research is the descriptive method and determination of location sampling using purposive sampling Methode. The research was conducted on two different locations with each location having 2 stations, at each station having 3 substations. Sampling of fish larvae is done using the net larva (P = 0.9 m; L: 0, 6m) with mesh eye size 800 μm. The obtained samples were then sorted and identified using literature. The results of this study were found in the larvae of 8 families Nemipteridae, Lutjanidae, Ambassidae, Sphyraenidae, Bothidae, Clupeidae, Chanidae, Monacanthidae. The family of fish larvae most commonly found are Nemipteridae. The value of the diversity index of the four stations is included in the low-medium category (0.92 - 1.50). The value of the diversity index of four stations is included in the medium-high category (0.61 - 1.00). The value of the index of the dominance of the fish from the four stations indicates that there is no dominant family (0.23 - 0.54). 

DIVERSITY OF FISH LARVAE AROUND THE ESTUARY OF THE BANYUASIN RIVER, SOUTH SUMATERA PROVINCE

2020 ◽  
Vol 6 (2) ◽  
Author(s):  
Moh. Rasyid Ridho ◽  
Enggar Patriono ◽  
Sarno Sarno ◽  
Sahira Wirda
Keyword(s):  
Initial Phase ◽  
Sampling Method ◽  
Environmental Changes ◽  
Negative Impact ◽  
Fish Larvae ◽  
River Estuary ◽  
Sampling Technique ◽  
Critical Phase ◽  
Morisita Index ◽  
Index Value

The initial phase of the fish life cycle is a critical phase associated with high mortality due to sensitivity to predators, food availability, and also environmental changes that occur in nature. Disruption of the initial stages of fish life has a negative impact on fish populations. Until now there has been no information about fish larvae around the Banyuasin River Estuary. Therefore, research is needed on the diversity of fish larvae around the Banyuasin River Estuary, South Sumatra Province. This research were used purposive sampling method, sampling technique in the form of Cruise Track Design with continuous parallel survey trajectory. Based on the results of the study found as many as 10 families consisting of 1483 individuals of fish larvae in March and 1013 individuals of fish larvae in May consisting of Engraulidae 1,601 individuals of fish larvae, Mungiloidei as many as 109 individuals, Leiognathidae 50 individuals, Chanidae 453 individuals, Scatophagidae 20 individuals , Belonidae 39 individuals, Gobioididae 5 individuals, Chandidae 183 individuals, Syngnatihidae 6 individuals, and Gobiidae 30 individuals fish larvae. The index value of fish larvae diversity is classified as medium category (March 1.02 and May 1.12), Morisita index shows the distribution pattern of fish larvae classified as a group (March 0-14.17 and May 2.43-10.40 ), and the evenness index value is in the medium category (March 0.437 and May 0.521).

Isolation, morphometry, and culture of Colurella sp. (Rotifera: Ploimida)

2013 ◽  
Vol 1 (2) ◽  
pp. 143
Author(s):  
Petrus P Letsoin ◽  
Henneke Pangkey ◽  
Julius Sampekalo ◽  
Inneke F.M Rumengan ◽  
Stenly Wullur ◽  
...  
Keyword(s):  
Body Size ◽  
Marine Fish ◽  
Fish Larvae ◽  
Nannochloropsis Oculata ◽  
Tropical Fish ◽  
Sampling Location ◽  
Larval Rearing ◽  
Brachionus Rotundiformis ◽  
Marine Fish Larvae ◽  
Significant Difference

The rotifer Brachionus rotundiformis (total body length 240.59±10.24 μm, lorica length 175.28±9.18 μm, and lorica width 124.28±7.76μm) is commonly used as starter food in the larval rearing of marine fish. But, larvae of some marine tropical fish species required starter food with body size smaller than B. rotundiformis. The present study was aimed to isolate minute rotifers from nature and to assess the possibility of culturing these rotifers. Sampling of rotifers was conducted in an estuary of Mangket (Kema-Minut), using plankton net (mesh size 40 µm). A trial of culturing the rotifers was conducted at salinities of 10, 20 and 30 ppt by using a microalga, Nannochloropsis oculata. A species of rotifer identified as Colurella sp. (family Lepadellidae) was successfully isolated from the sampling location. Body size of Colurella sp. was extremely small (Total length 123.22±5.45 μm, lorica length 95.96±3.81 μm, and lorica width 53.57±3.11 μm), which were smaller than Brachionus rotundiformis SS-type as a conventional starter food for marine fish larvae.  Results of culturing the minute rotifer Colurella sp. showed that the species grew well at salinities of 10, 20 and 30 ppt with no significant difference among treatments (ANOVA, p>0.05), indicating a potential use of minute rotifer Colurellasp. as starter food for marine fish larvae. Rotifera Branchionus rotundiformis (ukuran tubuh: panjang total 240,59±10,24 μm, panjang lorika 175,28±9,18 μm, dan lebar lorika 124,28±7,76μm) sering digunakan sebagai pakan awal pemeliharaan larva ikan laut. Namun, larva beberapa spesis ikan laut tropis membutuhkan pakan awal berukuran tubuh lebih kecil dari Branchionus rotundiformis. Penelitian ini bertujuan untuk mendapatkan minute rotifer dari alam (berukuran tubuh lebih kecil dari B. rotundiformis) dan menguji kemungkinan pemeliharaannya. Sampling rotifer dilakukan di perairan estuari Desa Mangket (Kema-Minut), menggunakan plankton net (ukuran mata jaring 40 µm). Uji coba pemeliharaan dilakukan pada salinitas (10, 20, dan 30 ppt) dengan menggunakan Nannochloropsis oculata. Satu spesies minute rotifer yang teridentifikasi sebagai Colurella sp. (family Lepadellidae) berhasil diisolasi dari lokasi sampling. Colurella sp. memiliki ukuran tubuh sangat kecil (panjang total [PT] 123,22±5,45 µm, panjang lorika [PL] 95,96±3,81 µm, dan lebar lorik [LL] 53,57±3,11 µm) yang mana lebih kecil dari Branchionus rotundiformis tipe-SS sebagai pakan awal larva ikan laut. Hasil uji coba pemeliharaan minute rotifer Colurella sp. menunjukkan bahwa spesis ini dapat tumbuh pada salinitas 10, 20, dan 30 ppt dengan perbedaan kepadatan populasi yang tidak signifikan antar perlakuan (Uji ANOVA, p > 0.05) mengindikasikan potensi pemanfaatan minute rotifer Colurella sp. sebagai pakan awal larva ikan laut.

scholarly journals Preliminary Study on Fish Larvae at Selected Coastal Waters of Sarawak

1970 ◽  
Vol 4 (2) ◽  
pp. 1-8
Author(s):  
Norhakimi Muhamad ◽  
Siti Akmar Khadijah Ab Rahim
Keyword(s):  
Coastal Waters ◽  
Intertidal Zone ◽  
Larval Dispersal ◽  
Sampling Methods ◽  
Fish Larvae ◽  
Mesh Size ◽  
Subtidal Zone ◽  
Preliminary Study ◽  
Study Sites

A survey were carried out from April to November 2012 at five study sites namely Teluk Pandan beach, Rambungan beach, Puteri beach, Sampadi Island and Satang Besar Island, Sarawak. This survey was carried out in order to obtain early documentation of fish larvae at selected coastal waters of Sarawak. Seine net (1 mm mesh size) which was pulled by two persons at intertidal zone; and bridle net (0.5 mm mesh size) that was towed by boat at subtidal zone (Sampadi Island only) were used to collect the samples. A total of 2,562 fish larvae which comprise 25 families were obtained from both sampling methods. A total of 16 families of fish larvae were caught by seine net from the intertidal zone. The same number of families was collected at the subtidal zone of Sampadi Island by bridle net. Ambassidae, Clupeidae, Engraulidae and Gerreidae found to be dominant families in the study sites. Clupeidae and Gerreidae shown a wide larval dispersal area because they were collected at all study sites. These findings seem to indicate that the subtidal zone of Sampadi support more species of fish larvae.

scholarly journals Struktur Komunitas Fitoplankton di Kolam Bekas Pertambangan Batubara Desa Kampung Baru Kecamatan Cempaka

BIOSCIENTIAE ◽  
2021 ◽  
Vol 17 (2) ◽  
pp. 37
Author(s):  
Sukoco Sukoco ◽  
Gunawan Gunawan ◽  
Muhamat Muhamat
Keyword(s):  
Community Structure ◽  
Coal Mining ◽  
Sampling Method ◽  
Diversity Index ◽  
Pool Analysis ◽  
Fertility Rate ◽  
The State ◽  
Purposive Sampling ◽  
Phytoplankton Communities ◽  
Average Abundance

This study aims to determine the structure of phytoplankton communities in the pool are former coal mining Desa Kampung Baru Kecamatan Cempaka which include abundance, diversity, uniformity and dominance. Phytoplankton samples taken in two pools with a purposive sampling method with a three-point shooting at each pond. Sampling was performed three times. Phylum of phytoplankton were identified in both pools as much as 2 phylum (Chloropyta and Chrysopita) with 17 genera. Average abundance of phytoplankton in the first pool of 7174 ind / liter and 6873 ind / liter in the second pool. The average diversity index of phytoplankton in the first pool of 1.540 and 1.621 in the second pool. Average uniformity index of phytoplankton in the first pool of 0622 and 0.623 in the second pool. The average index of phytoplankton dominance in the first pool of 0271 and 0250 in the second pool. Analysis of community structure (abundance, diversity, uniformity and dominance) shows the condition of the two ponds in the state is quite stable and capable of supporting life inside the phytoplankton. Where the pool in the fertility rate is the level of contamination is, the conditions included in the category of individuals spread more evenly and there are no species that dominate other species in the extreme.

scholarly journals ANALISIS KUALITAS PERAIRAN BERDASARKAN KOMPOSISI DAN KELIMPAHAN FITOPLANKTON DI SUNGAI LANANGAN, KLATEN

2018 ◽  
Vol 7 (3) ◽  
pp. 253-262
Author(s):  
Faudzi Ath Tho Azzam ◽  
Niniek Widyorini ◽  
Bambang Sulardiono
Keyword(s):  
Sampling Method ◽  
Phytoplankton Community ◽  
Diversity Index ◽  
Animal Husbandry ◽  
Open Water ◽  
Survey Method ◽  
Purposive Sampling ◽  
Freshwater Aquaculture ◽  
Range Of Values

Sungai Lanangan merupakan bagian hulu Sungai Bengawan Solo yang terletak di Desa Daleman, Kecamatan Tulung, Kabupaten Klaten. Jenis limbah seperti limbah domestik, industri, pertanian, perikanan dan peternakan telah mencemari Sungai Lanangan. Limbah organik dari industri tepung aren dan mie soun yang dibuang di Sungai Lanangan mencapai 50 ton limbah per hari. Hal tersebut menyebabkan perubahan kualitas air dan komposisi fitoplankton di Sungai Lanangan.Penelitian ini dilakukan dari bulan Januari - Februari 2018 di Sungai Lanangan. Tujuan dari penelitian ini adalah untuk mengetahui kelimpahan dan komposisifitoplankton serta mengetahui kualitas perairan berdasarkan struktur komunitas fitoplankton di Sungai Lanangan tersebut. Penelitian ini menggunakan metode survei denganpengambilan sampel menggunakan metode purposive sampling. Frekuensi pengambilan sampel dilakukan setiap 1 minggu sekali selama 3 minggu. Sampel diambil dari 3 stasiun, dimana stasiun 1 dengan karakteristik perairan terbuka; Stasiun 2 dengan karakteristik dekat industri pengolahan tepung aren; dan stasiun 3 dengan karakteristik dekat dengan daerah budidaya air tawar.Hasil penelitian didapatkan 11 genera fitoplankton yaitu dari kelas Bacillariophyceae (4 genera), Cyanophyceae (2 genera), Chrysophyceae (1 genus), Ulvophyceae (2 genera), Zygnematophyceae (1 genus) dan Chlorophyceae (1 genus). Kelimpahan rata-rata fitoplankton tertinggi terdapat pada stasiun 2 dengan kelimpahan 1.989 ind/l yang didominasi oleh genus Oscillatoria. Indeks keanekaragaman rata-rata pada setiap stasiun adalah 1,68 pada stasiun 1; 1,63 pada stasiun 2; dan 1,52 pada stasiun 3. Dari hasil indeks keanekaragaman yang didapatkan tersebut menunjukkan kisaran nilai antara 1,52 hingga 1,68 yang berarti bahwa kualitas perairan Sungai Lanangan tercemar ringan.  Lanangan river is one upstream of Bengawan Solo river which located at Daleman, Tulung, Klaten. types of waste such as domestic waste, industrial waste, agriculture, fishery and animal husbandry polluted Lanangan river. Especially organic waste from palm starch and soun noodle industry that are dumped in the Lanangan river reaches 50 tonnes waste per day. This research was conducted from January to February 2018 in the Lanangan river. The purpose of this research is to find out the abundance and composition of phytoplankton; and to determine the water qualitybased on the structure of the phytoplankton community in Lanangan river. This research uses survey method and use purposive sampling method. The Frequency of sampling is done once a week for 3 week. The samples taken from 3 stations, where station 1 is open water; Station 2 is near palm starch and soun noodle industry; and station 3 is close to freshwater aquaculture area.The resultsof the research found 11 genus of phytoplankton in class Bacillariophyceae, Cyanophyceae, Chrysophyceae, Ulvophyceae, Zygnematophyceae and Chlorophyceae. The highest average of phytoplankton abundance found in station 2 with 1,989 ind/l which is dominated by the genus of Oscillatoria. The average diversity index each station is 1.68 at station 1; 1.63 at station 2; and 1.52 at station 3. From the results obtained the diversity index indicates the range of values between 1.52 to 1.68 which show that the water quality of Lanangan River is lightly to moderate polluted.  

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