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 FAKTOR FISIK KIMIA LINGKUNGAN PENDUKUNG KEANEKARAGAMAN DAN KEMERATAAN HOLOTHUROIDEA PADA ZONA INTERTIDAL DESA HILA KECAMATAN KEPULAUAN ROMANG KABUPATEN MALUKU BARAT DAYA

2016 ◽  
Vol 3 (1) ◽  
pp. 28-32
Author(s):  
Sriyanti I. A. Salmanu
Keyword(s):  
Coastal Waters ◽  
Intertidal Zone ◽  
Sea Cucumber ◽  
Diversity Index ◽  
Characteristic Temperature ◽  
Physical Factors ◽  
Environmental Characteristic ◽  
Fairness Index ◽  
Study Sites ◽  
Holothuria Atra

Background: The sea is an ecosystem that has high biodiversity. Hila Village is one area that has a large enough waters located in the western part of Romang island, District of Romang Islands, Southwest Maluku District. Intertidal Zone Hila Village has different types of substrate, both muddy, sandy, sandy, dreamy, rocky, rocky, sandy, rocky, and rocky rocked. The existence of the types of sea cucumbers (Holothuroidea) in the coastal waters of Hila village quite a lot, physical chemical environmental factors in the coastal waters of Hila Village support the life of the sea cucumber. Method: This research is descriptive research that reveal information about environmental characteristic (temperature, pH, salinity, and dissolved oxygen), diversity and evenness of sea cucumber in intertidal zone of Hila Village. Results: The results of the research on the intertidal zone of Hila Village, Pulau Romang Subdistrict, Southwest Maluku District, were found 7 genus and 8 spesies. The types of Holothuroidea found in the study sites are Bohadschia argus, Holothuria atra, Holothuria edulis, Bohadschia marmorata, Holothuria scraba, Chiridota violaceae, Holothuria fuscopunctata, and Opheodesoma spectabili. The Holothuroidea diversity index in the Intertidal Zone of Hila Village is 1.56, categorized by medium diversity, for evenly distributed evenness because the fairness index is 1.05. Conclusion: The index of the Holothuroidea diversity in the Intertidal Zone of Hila Village is 1.56, categorized by medium diversity, for evenly distributed evenness because the fairness index is 1.05. Chemical Physical Factors The envelope found was the average temperature of 28.270C, the average pH 6.373, and the average salinity of 4.94%, indicating that the Holothuroidea was able to adapt and live in the intertidal zone of Hila Village.

scholarly journals Interaction of oceanography patterns towards the abundance of phytoplankton, zooplankton and ichthyoplankton in teluk penyu waters of Cilacap

2018 ◽  
Vol 47 ◽  
pp. 05002
Author(s):  
Florencius Eko Dwi Haryono ◽  
Rose Dewi ◽  
Taufik Budhi Pramono ◽  
Rifki Ahda Sumantri ◽  
Tri Nur Cahyo ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Relative Abundance ◽  
Coastal Waters ◽  
Fish Larvae ◽  
Mesh Size ◽  
Mangrove Forests ◽  
Zooplankton Species ◽  
High Productivity ◽  
Physical Chemical ◽  
Components Analysis

Coastal waters of Teluk Penyu-Cilacap district is an enlarging area for many species of fish larvae. The waters is directly influenced by the physical, chemical and biological of Indian Ocean patterns. Fish communities inhabit in gulf waters to take advantage of the high productivity in the coastal waters to support their livelihoods. The gulf area is usually associate with other productive ecosystems i.e. rivers that empties into it and mangrove forests. The study aim is to analyze the influence of oceanography pattern to the existence of ichthyoplankton [fish larvae] inhabit at Teluk Penyu waters of Cilacap district. Sampling is conducted monthly from April - June 2009 at 3 sites. The sites were set 1 mile of distance from coastline at Teluk Penyu Cilacap, PPSC and RSPC waters. Fish larvae were collected using larvae net mesh size 0.5 mm and 75 cm mouth diameter and phytoplankton and zooplankton are collected using plankton net . Larvae net was towed on the surface of the waters using a motorized boat with a speed 1 knot. Data were analyzed statistically based on Principal Components Analysis/PCA. 30 species of phytoplankton and 25 species of zooplankton species were identified from the waters. The species of phytoplankton and zooplankton were obtained difference species at each site. The highest abundance of phytoplankton were species of Chaetoceros and the abundance of zooplankton from the highest subsequence are species of Coelosphaerium dubium and Platydorina. The highest of relative abundance of ichthyoplankton in Teluk Penyu tourism waters was obtained 41,463% of the crawfish [Crumrnophthalmus spp.], followed by pheasant fish [Auriglobus nefastus] 8.53667%, and swordfish (Chirocentrus dorab spp.) 2.439%, and fish beloso [Tumbilic saurida] and gulamah fish (Johnius dussumieri) which are 1.2195%. The abundance of phytoplankton and zooplankton associated to ichthyoplankton abundance. The Southern of Teluk Penyu gulf waters was highest abundance area of ichthyoplankton.

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.

scholarly journals Zonation in a cryptic Antarctic intertidal macrofaunal community

2012 ◽  
Vol 25 (1) ◽  
pp. 62-68 ◽  
Author(s):  
Catherine L. Waller
Keyword(s):  
Outer Surface ◽  
Intertidal Zone ◽  
General View ◽  
Annual Cycles ◽  
West Antarctic ◽  
Order Of Magnitude ◽  
Size Of Animals ◽  
Study Sites ◽  
Macrofaunal Community ◽  
The Antarctic

AbstractDespite the general view that the Antarctic intertidal conditions are too extreme to support obvious signs of macrofaunal life, recent studies have shown that intertidal communities can survive over annual cycles. The current study investigates distribution of taxa within a boulder cobble matrix, beneath the outer, scoured surface of the intertidal zone at Adelaide Island, west Antarctic Peninsula. The intertidal zone at the study sites comprised compacted, flattened cobble pavements, which have been shown to be highly stable over time. Community structure was investigated using univariate and multivariate approaches. Virtually no macrofauna were present on the outer surface, but richness, diversity, abundance and size of animals increased with depth into the rock matrix. Abundance of taxa increased by an order of magnitude between the outer surface and the lowest level sampled. These findings show that the Antarctic intertidal is not always the uninhabitable environment currently perceived, and that under these highly variable environmental conditions at least some species have the capacity to survive.

scholarly journals Relating Hydrodynamic Forcing and Topographic Response for Tide-Dominated Sandy Beaches

2020 ◽  
Vol 8 (3) ◽  
pp. 151 ◽  
Author(s):  
Evelien Brand ◽  
Anne-Lise Montreuil ◽  
Rik Houthuys ◽  
Margaret Chen
Keyword(s):  
Intertidal Zone ◽  
Spring Tide ◽  
Field Measurements ◽  
Sandy Beaches ◽  
Tidal Currents ◽  
Sediment Supply ◽  
Wave Steepness ◽  
Natural Sediment ◽  
Order Of Magnitude ◽  
Study Sites

To relate hydrodynamic forcing and topographic response for a tide-dominated sandy beach, extensive field measurements were carried out in the intertidal zone. Hydrodynamics and beach topography were monitored during a total of 12 weeks at two different study sites: one with a featureless intertidal zone and one with intertidal bars. The results of both study sites indicate that the intertidal beach grows when wave steepness is small, whereas it erodes when wave steepness is large. Spring-neap variations in tidal current direction heavily distort this trend: strong spring tidal currents transport sediment away from the beach, resulting in enhanced erosion. Tide-induced beach volume changes are on the same order of magnitude as wave-induced changes. Besides waves and tides, the effect of variations in the amount of sediment supply is substantial, with enhanced accretion when the sediment supply is large. The effect of variations in sediment supply on the intertidal beach topography is subordinate to the effect of waves and tide, though. From this study, it is concluded that larger waves are primarily erosive, but they can also enhance the natural sediment supply. Furthermore, it is found that tidal currents can be equally important as waves in shaping the beach topography, especially during spring tide on macrotidal beaches.

The contamination of inland waters by microplastic fibres under different anthropogenic pressure: Preliminary study in Central Europe (Poland)

2020 ◽  
Vol 38 (11) ◽  
pp. 1231-1238
Author(s):  
Anita Kaliszewicz ◽  
Michał Winczek ◽  
Kamil Karaban ◽  
Dominik Kurzydłowski ◽  
Maria Górska ◽  
...  
Keyword(s):  
High Probability ◽  
Control Sample ◽  
Mesh Size ◽  
Freshwater Ecosystems ◽  
Inland Waters ◽  
Anthropogenic Pressure ◽  
Large Cities ◽  
Field Samples ◽  
Northeastern Poland ◽  
Preliminary Study

The contamination of freshwater ecosystems with microfibres has not yet been studied in Poland. We analysed samples from a river and three lakes located in central and northeastern Poland. A significantly higher number of fibres were reported in the river, which runs through large cities, compared with the lake situated within the Landscape Park. Fibres smaller than 1.0 mm dominated, especially in the river where they constituted 39% of all fibres detected. We found more microplastics (⩽ 4930 fibres·m−3) by using a mesh size of 20 µm compared with other studies of inland waters. The use of Raman spectroscopy allowed us to identify conventional plastic polymers: polyethylene terephthalate, polyester and polyurethane. We estimated that up to 25 g of microplastic in the form of fibres might be in the lake water under the surface. We found microplastic fibres in Majcz Lake situated within the Masurian Landscape Park. This suggests that microfibres are carried by the wind and rain and enter freshwater isolated from sewage outlets. By using the control sample and an air-test of microfibres in the laboratory, we observed that there is a high probability of contamination with microplastic in the field samples (up to 30% of all fibres detected). The contamination risk noted from the samples cannot be ignored; this could be particularly important for analysis of microplastic in remote freshwater ecosystems.

scholarly journals Spatial distribution and abundance of nonindigenous coral genus Tubastraea (Cnidaria, Scleractinia) around Ilha Grande, Brazil

2005 ◽  
Vol 65 (4) ◽  
pp. 661-673 ◽  
Author(s):  
A. F. Paula ◽  
J. C. Creed
Keyword(s):  
Spatial Distribution ◽  
Coastal Waters ◽  
Sampling Methods ◽  
Geographic Range ◽  
Shallow Waters ◽  
Rocky Shores ◽  
Visual Estimation ◽  
Hard Substratum ◽  
Coral Genus ◽  
Different Depths

The distribution and abundance of azooxanthellate coral Tubastraea Lesson, 1829 were examined at different depths and their slope preference was measured on rocky shores on Ilha Grande, Brazil. Tubastraea is an ahermatypic scleractinian nonindigenous to Brazil, which probably arrived on a ship's hull or oil platform in the late 1980's. The exotic coral was found along a great geographic range of the Canal Central of Ilha Grande, extending over a distance of 25 km. The abundance of Tubastraea was quantified by depth, using three different sampling methods: colony density, visual estimation and intercept points (100) for percentage of cover. Tubastraea showed ample tolerance to temperature and desiccation since it was found more abundantly in very shallow waters (0.1-0.5 m), despite the fact that hard substratum is available at greater depths at all the stations sampled. At most sites, 1 to 5 colonies per 0.25 m² were found most frequently, but occasionally more than 50 colonies were found per 0.25 m², indicating a somewhat gregarious spatial distribution for this coral. The coral Tubastraea was found to occupy slopes of every possible angle in the Canal Central of Ilha Grande, but more colonies were found occupying slopes of 80 to 100°. Therefore, its insensitivity to angles of recruitment and its tolerance for different depths makes it an organism with great ecological tolerance, with a potential to colonize new areas and increase its current range in Brazil's coastal waters.

A preliminary study of heavy metal contamination in Yangtze River intertidal zone due to urbanization

2004 ◽  
Vol 49 (11-12) ◽  
pp. 910-915 ◽  
Author(s):  
Huan Feng ◽  
Xiaofei Han ◽  
Weiguo Zhang ◽  
Lizhong Yu
Keyword(s):  
Heavy Metal ◽  
Intertidal Zone ◽  
Metal Contamination ◽  
Yangtze River ◽  
Heavy Metal Contamination ◽  
Preliminary Study

Larval dispersal and recruitment of Haliotis discus hannai and Tegula spp. on Miyagi coasts, Japan

1995 ◽  
Vol 46 (3) ◽  
pp. 519 ◽  
Author(s):  
R Sasaki ◽  
SA Shepherd
Keyword(s):  
Coastal Waters ◽  
Larval Dispersal ◽  
Survival Rates ◽  
Adaptive Significance ◽  
Depth Range ◽  
Haliotis Discus Hannai ◽  
Storm Events ◽  
Average Survival ◽  
Miyagi Prefecture ◽  
Haliotis Discus

The spatial dispersal and vertical distribution of larvae of Haliotis discus hannai and Tegula spp. were examined in relation to storm events in Miyagi Prefecture, Japan, from 1983 to 1993. Epidemic spawning is induced by typhoons and minor storms. After typhoons, larvae are dispersed in coastal waters up to 3 km from shore to a depth of 30 m and later are advected toward the coast by onshore winds. After minor storms, larvae are locally dispersed close to shore. Larvae of H. discus hannai and Tegula spp. become vertically stratified and settle on the substratum at depths in accordance with the vertical depth range of their larvae. Strong settlements of H. discus hannai of up to 200 m-2 were recorded around headlands, with average survival rates of about 13% per month in the first 2-3 months. The adaptive significance of dispersal over short and long distances is considered.

Sign in / Sign up

Export Citation Format

Share Document