scholarly journals KOMPOSISI LARVA IKAN DI KAWASAN KOSERVASI MANGROVE DUSUN SENIK, DESA BEDONO, KECAMATAN SAYUNG, DEMAK

2018 ◽  
Vol 6 (2) ◽  
pp. 147-155
Author(s):  
Rexa Kurnia Rinaldi ◽  
Niniek Widyorini ◽  
Pujiono Wahyu Purnomo
Keyword(s):  
Distribution Pattern ◽  
Larval Fish ◽  
Fish Larvae ◽  
Mangrove Ecosystem ◽  
Fish Distribution ◽  
Sampling Point ◽  
Conservation Area ◽  
Morisita Index ◽  
Early Growth Phase ◽  
Mangrove Conservation

ABSTRAK Stadia larva merupakan fase pertumbuhan awal ikan. Distribusi dan Kelimpahan larva ikan di Ekosistem Mangrove merupakan proses rekruitmen alami. Kawasan Konservasi Mangrove Dusun Senik Desa Bedono merupakan daerah asuhan dan daerah mencari makan bagi larva ikan, saat ini daerah tersebut terkena abrasi. Hilangnya sebagian besar daratan memberikan pengaruh terhadap distribusi dan kelimpahan larva ikan. Penelitian ini bertujuan untuk mengetahui jenis, kelimpahan, dan sebaran larva ikan di kawasan konservasi mangrove Desa Bedono. Penelitian dilakukan di Kawasan Konservasi Mangrove Desa Bedono bulan September - Oktober 2016.  Metode penelitian yang digunakan adalah survei dengan penentuan titik sampling secara purposive. Hasil yang diperoleh jumlah larva ikan yang tertangkap sebanyak 20.320 individu/150m3 yang terdiri dari 12 famili yaitu: Mugilidae (1.120 ind/150m3), Chanidae (20 ind/150m3), Gerreidae (60 ind/150m3), Apogonidae (17.360 ind/150m3),  Scatophagidae (40 ind/150m3), Gobiidae (180 ind/150m3), Belonidae (40 ind/150m3), Ambassidae (20 ind/150m3), Lutjanidae (620 ind/150m3), Engraulidae (60 ind/150m3), Nemipteridae (40 ind/150m3), dan Oryziatidae (760 ind/150m3). Nilai kelimpahan larva ikan pada titik I sebesar 393 ind/150m3, titik II sebesar 607 ind/150m3, titik III sebesar 800 ind/150m3, titik IV sebesar 1.687 ind/150m3, titik V sebesar 1.633 ind/150m3, titik VI sebesar 607 ind/150m3, titik VII sebesar 235 ind/150m3, titik VIII sebesar 793 ind/150m3. Berdasarkan indeks morisita, pola sebaran larva ikan adalah acak. Kesimpulan yang dapat diambil adalah famili Apogonidae mendominasi dengan persentase 85,43%, nilai kelimpahan tertinggi terdapat pada titik IV, dan pola distribusi larva ikan menyebar secara acak yaitu keberadaan spesies tidak memiliki kecenderungan untuk hidup berkoloni dan dapat bertahan hidup di mana saja pada suatu ekosistem. Kata Kunci : Larva ikan; Komposisi; Kelimpahan; Pola Distribusi; Kawasan Konservasi Mangrove ABSTRACT Larval stage is the early growth phase of fish. Distribution and abundance of larval fish in mangrove ecosystem is a natural recruitment process. Mangrove Conservation Area at Senik hamlet Bedono village is the breeding and feeding areas for fish larvae, now the area is damaged by abrasion. The loss of the most mainland affects to the distribution and abundance of fish larvae. This study aims to determine the type, abundance and distribution of fish larvae in mangrove conservation area at Bedono village. The study was conducted in Bedono village Mangrove Conservation Area in September-October 2016. The research method that is used is a survey with purposive sampling point determination. The results obtained, the number of fish larvae caught are 20.320 individuals/150m3 consisting of 12 families, namely: Mugilidae (1.120 ind/150m3), Chanidae (20 ind/150m3), Gerreidae (60 ind/150m3), Apogonidae (17.360 ind/150m3), Scatophagidae (40 ind/150m3), Gobiidae (180 ind/150m3), Belonidae (40 ind/150m3), Ambassidae (20 ind/150m3), Lutjanidae (620 ind/150m3), Engraulidae (60 ind/150m3), Nemipteridae (40 ind/150m3), and Oryziatidae (760 ind/150m3). The value abundance of fish larvae in point I is 393 ind/150m3, in point II is 607 ind/150m3, in point III is 800 ind/150m3, point IV is 1.687 ind/150m3, point V is 1.633 ind/150m3, point VI is 607 ind/150m3, point VII is 235 ind/150m3, point VIII is 793 ind/150m3. Based on morisita index, the distribution pattern of fish larvae is random. The conclusion of this research are family Apogonidae dominates by percentage 85.43%, the highest abundance values is contained in point IV, and the  distribution pattern of fish larvae randomly spread, means that the species does not live in colonies and can survive anywhere in an ecosystem. Keywords     : Fish Larvae; Composition; Abundance; Distribution; Mangrove Conservation Area

scholarly journals DISTRIBUSI DAN KELIMPAHAN LARVA IKAN DI KAWASAN PERAIRAN DESA MANGUNHARJO KECAMATAN TUGU KOTA SEMARANG

2018 ◽  
Vol 7 (1) ◽  
pp. 86-98
Author(s):  
Handika Wahyu Viyoga ◽  
Anhar Solichin ◽  
Nurul Latifah
Keyword(s):  
Fish Larvae ◽  
Fish Larva ◽  
Environmental Parameters ◽  
Distribution Patterns ◽  
Mangrove Ecosystem ◽  
Coastal Ecosystem ◽  
Sampling Point ◽  
Correlation Criterion ◽  
Morisita Index ◽  
Family Based

Distribusi dan kelimpahan larva ikan sangat bergantung dengan kondisi perairan di dalamnya. Kawasan perairan Desa Mangunharjo merupakan daerah yang unik karena memiliki tiga ekosistem yang berbeda yaitu ekosistem pantai, ekosistem muara, dan ekosistem mangrove. Penelitian ini bertujuan untuk mengetahui pola distribusi dan kelimpahan larva ikan pada tiga ekosistem yang berbeda di kawasan perairan Desa Mangunharjo. Penelitian dilaksanakan pada bulan Juli-Agustus 2017. Metode penelitian yang digunakan adalah survei dengan penentuan titik sampling secara systematic random. Hasil yang diperoleh menunjukkan bahwa jumlah larva ikan yang tertangkap sebanyak 1.089 individu terdiri dari 7 famili yakni: Ambassidae (260 ind/100m3), Nemipteridae (94 ind/100m3), Engraulidae (424 ind/100m3), Apogonidae (20 ind/100m3), Mugilidae (156 ind/100m3), Gobidae (37 ind/100m3), dan Chanidae (98 ind/100m3). Larva ikan famili Engraulidae tertangkap paling banyak selama dilakukan penelitian. Berdasarkan analisis indeks Morisita, pola distribusi larva ikan adalah acak. Kesimpulan yang dapat diperoleh ialah nilai kelimpahan larva ikan tertinggi terdapat pada ekosistem pantai sebesar 673 ind/100m3 dan terendah terdapat pada ekosistem muara sebesar 188 ind/100m3. Nilai keanekaragaman pada ekosistem pantai, muara, dan mangrove tergolong sedang. Nilai keseragaman di semua ekosistem pengambilan sampel termasuk tinggi. Nilai indeks dominasi pada setiap ekosistem termasuk dalam kriteria nilai yang mendekati 0, yang dapat diartikan tidak ada individu yang mendominasi. Hasil uji Kruskal Wallis untuk nilai kelimpahan larva ikan menunjukkan terdapat perbedaan kelimpahan larva ikan yang nyata di setiap ekosistem. Keterkaitan parameter lingkungan dengan kelimpahan larva ikan yang di uji menggunakan regresi linier berganda menunjukkan nilai korelasi (R) yang termasuk ke dalam kriteria hubungan sedang, untuk nilai determinasi (R2) sebesar 0,131 yang menunjukkan 13,1% kelimpahan ikan dipengaruhi oleh parameter lingkungan. The distribution and abundance of fish larvae depends on the condition of the waters. The waters of Mangunharjo Village are unique because they have three different ecosystems, the first coastal ecosystem, the two estuarine ecosystems, and the last of the mangrove ecosystem. This study aims to determine the distribution patterns and abundance of fish larvae in three different ecosystems in the waters of Mangunharjo Village. The research was conducted on July-August 2017. The research method used the survey, with sistematic random sampling point. The results showed amount of fish larvae caught were 1,089 individuals consisting of 7 families, that is Ambassidae (260 ind/100m3), Nemipteridae (94 ind/100m3), Engraulidae (424 ind/100m3), Apogonidae (20 ind/100m3), Mugilidae (156 ind/100m3), Gobidae (37 ind/100m3), and Chanidae (98 ind/100m3). The most larvae caught on the study is Engraulidae family. Based on the Morisita index analysis, the pattern of fish larvae distribution is random. The conclusion that can be obtained is the highest value of fish larvae abundance found in the coastal ecosystem of 673 ind / 100m3 and the lowest is in the estuary ecosystem of 188 ind / 100m3. The value of diversity in coastal, estuarine and mangrove ecosystems is moderate. The value of uniformity in all sampling ecosystems is high. The value of the dominance index in all ecosystem is included in the criterion of value close to 0, which can be interpreted as no individual dominates. The Kruskal Wallis test results for the fish larvae abundance values indicate that there are differences in fish larva abundance which is evident in each ecosystem. The correlation of environmental parameters with abundance of fish larvae tested using multiple linear regression showed correlation value (R) belonging to intermediate correlation criterion, for determination value (R2) equal to 0,131 showing 13,1% fish abundance influenced by environmental parameter.

Influence of tidal phase and circulation on larval fish distribution in a partially mixed estuary, Corral Bay, Chile

2003 ◽  
Vol 83 (1) ◽  
pp. 217-222 ◽  
Author(s):  
Cristian A. Vargas ◽  
Sandro E. Araneda ◽  
Guillermo Valenzuela
Keyword(s):  
Larval Fish ◽  
Fish Larvae ◽  
Salt Water ◽  
Larval Density ◽  
Abundant Species ◽  
Fish Distribution ◽  
Older Individuals ◽  
Austral Spring ◽  
Tidal Front ◽  
Tidal Phase

The influence of circulation on abundance patterns of larval fish was compared at different phases of the tide in the vicinity of an estuarine front in Corral Bay, Chile during austral spring. Greatest differences in water salinity were found across the frontal region on ebb tides. Because rainfall was low, density differences were primarily due to tidal intrusion of salt water. Larval density was relatively low during both sampling periods with Strangomera bentincki, Oodntesthes regia laticlavia, Gobiesox marmoratus and Hypsoblennius sordidus as the most abundant species. Total ichthyoplankton was always higher near the tidal front (Stations 2 and 3). Spatial distribution in relation to tidal phase showed different patterns for the most abundant fish larval species. Circulation and larval distribution revealed that the bay was a source of young fish larvae but older individuals could also be recruited in and retained there. Results show that the front could act as a physical boundary for larvae transported from offshore through specific mechanism of circulation related with the tidal regime.

Different key roles of mesoscale oceanographic structures and ocean bathymetry in shaping larval fish distribution pattern: A case study in Sicilian waters in summer 2009

2016 ◽  
Vol 115 ◽  
pp. 6-17 ◽  
Author(s):  
Angela Cuttitta ◽  
Enza Maria Quinci ◽  
Bernardo Patti ◽  
Sergio Bonomo ◽  
Angelo Bonanno ◽  
...  
Keyword(s):  
Distribution Pattern ◽  
Larval Fish ◽  
Fish Distribution

scholarly journals DISTRIBUSI DAN KELIMPAHAN LARVA IKAN DI KAWASAN PERAIRAN PANTAI DUKUH BEDONO KECAMATAN SAYUNG KABUPATEN DEMAK (Distribution and Abundance of Fish Larvae in Coastal Waters of Bedono Village, Sayung, Demak Regency)

2018 ◽  
Vol 6 (4) ◽  
pp. 339-347
Author(s):  
Avisha Fauziah Erzad ◽  
Sahala Hutabarat ◽  
Max Rudolf Muskananfola
Keyword(s):  
Coastal Waters ◽  
Research Method ◽  
Fish Larvae ◽  
Coastal Region ◽  
Sampling Point ◽  
Mangrove Plant ◽  
Index Analysis ◽  
Life Phase ◽  
Morisita Index ◽  
Distribution Of Fish

Larva ikan merupakan fase kehidupan awal dari pertumbuhan ikan dimana perkembangan organ tubuh belum terbentuk secara sempurna. Distribusi dan kelimpahan larva ikan sangat bergantung pada kondisi perairan di dalamnya. Kawasan perairan pantai merupakan perairan yang terhubung langsung ke laut dan masih dipengaruhi oleh aktivitas daratan. Perairan pantai dukuh Bedono mengalami degradasi akibat berkurangnya tanaman mangrove dan terjadinya rob. Penelitian ini bertujuan untuk mengetahui distribusi dan kelimpahan larva ikan di kawasan perairan pantai dukuh Bedono. Penelitian dilaksanakan pada bulan Maret-April 2017. Metode penelitian yang digunakan adalah survei dengan penentuan titik sampling secara purposive. Hasil yang diperoleh menunjukkan bahwa jumlah larva ikan yang tertangkap sebanyak 2.064 individu terdiri dari 10 famili yakni: Ambassidae (245 ind/100 m3), Mugilidae (507 ind/100 m3), Chanidae (378 ind/100 m3), Engraulidae (288 ind/100 m3), Lutjanidae (73 ind/100 m3), Nemipteridae (109 ind/100 m3), Carangidae (145 ind/100 m3), Gobiidae (160 ind/100 m3), Gerreidae (92 ind/100 m3), dan Oryziatidae (67 ind/100 m3). Larva ikan famili Mugilidae tertangkap paling banyak selama pelaksanaan penelitian. Berdasarkan analisis indeks morisita, pola sebaran larva ikan adalah acak. Kesimpulan yang dapat diperoleh ialah nilai kelimpahan larva ikan tertinggi terdapat pada titik IV sebesar 267 ind/100m3 dan terendah terdapat pada titik III sebesar 185 ind/100 m3. Pola persebaran larva ikan pada semua titik adalah acak dimana semua larva ikan dapat menyesuaikan dan bertahan hidup di mana saja pada suatu ekosistem. Fish larvae are the early life phase of the growth of fish where the development of organs has not been fully formed. The distribution and abundance of fish larvae depend on the condition of the waters in it. Coastal waters are waters that connect directly to the sea and are still influenced by land activities. The coastal waters of Bedono village have degradation due to the decreasing of mangrove plant and the increasing of seawater period. This study aims to determine the distribution and abundance of fish larvae in the coastal region of Bedono village. The research was conducted in March-April 2017. The research method used was a survey with purposive sampling point. The results showed that the number of captured fish larvae of 2,064 individuals consisted of 10 families: Ambassidae (245 ind/100 m3), Mugilidae (507 ind/100 m3), Chanidae (378 ind/100 m3), Engraulidae (288 ind/100 m3) , Lutjanidae (73 ind/100 m3), Nemipteridae (109 ind/100 m3), Carangidae (145 ind/100 m3), Gobiidae (160 ind/100 m3), Gerreidae (92 ind/100 m3), and Oryziatidae (67 ind/100 m3). Fish larvae of the Mugilidae family were caught at the most during the study. Based on the morisita index analysis, the pattern of fish larvae distribution is random. The conclusion that can be obtained is the highest value of fish larvae abundance found at point IV of 267 ind/100 m3 and the lowest is at point III of 185 ind/100 m3. The pattern of the distribution of fish larvae at all points is unevenly where all fish larvae can adapt and survive anywhere in an ecosystem.

scholarly journals DISTRIBUSI DAN KELIMPAHAN LARVA IKAN PADA EKOSISTEM MANGROVE DI DESA PASAR BANGGI KABUPATEN REMBANG

2016 ◽  
Vol 5 (4) ◽  
pp. 199-208
Author(s):  
Firtasari Simanullang ◽  
Djuwito Djuwito ◽  
Abdul Ghofar
Keyword(s):  
Sampling Method ◽  
Larval Fish ◽  
Fish Larvae ◽  
Fish Larva ◽  
Diversity Indices ◽  
Mangrove Ecosystem ◽  
Stratified Sampling ◽  
Mangrove Area ◽  
Central Java ◽  
Key Words Fish

ABSTRAK Kabupaten Rembang merupakan salah satu kabupaten yang  terletak di pesisir Pantai utara Jawa Tengah yang mempunyai kawasan rehabilitasi mangrove seluas 106,66 ha. Ekositem mangrove di Kabupaten Rembang telah dikelola oleh masyarakat dan LSM setempat untuk dijadikan kawasan wisata dan masyarakat juga membuka lahan tambak yang dapat memberi tekanan bagi fungsi ekologis mangrove. Salah satu dampak yang sangat dikhawatirkan adalah terganggunya habitat vital serta perkembangan larva ikan di area asuhan hutan mangrove. Tujuan penelitian ini adalah mengetahui jenis famili larva ikan, distribusi, kelimpahan, keseragaman, keanekaragaman dan dominasi larva ikan di ekosistem mangrove di Desa Pasar Banggi Kabupaten Rembang. Penelitian ini dilakukan pada bulan April 2016. Pengambilan sampel dilakukan sebanyak tiga kali, dengan interval waktu 1 minggu sekali. Penelitian ini menggunakan metode survei sedangkan pengambilan sampel dilakukan dengan metode stratified sampling. Hasil penelitian didapatkan larva ikan dari tujuh famili, yaitu: Gerreidae, Gobiidae, Clupeidae, Engraulidae, Adrianichtyidae, Megalopidae dan Carangidae. Indeks keanekaragaman berkisar antara 0,087- 0,770, dengan nilai tertinggi di wilayah mangrove umur sekitar tiga  tahun. Indeks keseragaman berkisar antara 0,062 – 0,555, nilai tertinggi juga pada wilayah umur mangrove sekitar tiga tahun. Nilai indeks dominasi berkisar antara 0,577 – 0,972, dengan nilai tertinggi pada wilayah mangrove berumur lima puluh tahun. Kelimpahan tertinggi larva ikan yang tertangkap pada lokasi penelitian didapat pada wilayah A (wilayah mangrove berumur sekitar lima puluh tahun) adalah sebesar 40 Ind/m3, wilayah B (wilayah mangrove berumur sekitar tujuh tahun) sebesar 22 Ind/m3 dan yang terendah adalah wilayah C (wilayah mangrove berumur sekitar tiga tahun) sebesar 19 Ind/m3..                      Kata Kunci : Kelimpahan Larva Ikan; Mangrove; Kabupaten Rembang ABSTRACT Rembang Regency located in the northeastern part of Central Java which has 106.66 ha mangrove rehabilitation area. Mangrove ecosystem in Rembang has been managed by local communities and NGOs for eco-tourism. The local people also have actively cleared mangrove area for artificial ponds that are put an ecological pressure into mangrove ecosystem function.  One of the important impact that needs to be concerned is the disruption of vital habitat as well as the development of fish larvae in mangrove area. The purpose of this study was to determine the type of fish larvae families, distribution, abundance, uniformity, diversity and dominance of larval fish in in the mangrove ecosystem of Pasar Banggi, Rembang. The samplings were conducted in April 2016 three times, with intervals one week. The sampling method was done by stratified sampling method. In three times sampling we obtained seven families of fish larvae in the following name: Gerreidae, Gobiidae, Clupeidae, Engraulidae, Adrianichtyidae, Megalopidae and Carangidae. The diversity indices range between 0,087- 0,770, with the highest in level in mangrove area with mangrove age of three years. The uniformity index ranges between 0,062 – 0,555, the highest value is also in mangrove area with mangrove age of three years. The dominance index values ranging between 0,577 – 0,972, with the highest value in the in mangrove area with mangrove age of fifty years. Highest abundance of fish larvae were caught among the sites acquired in the area A ( mangrove area about fifty years ) is 40 Ind / m3 , region B ( mangrove area about seven years ) of 22 Ind / m3 and the lowest is the area C ( mangrove area about three years old ) by 19 Ind / m3 .Key Words: Fish Larva Abundance, Mangrove , Rembang District

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).

scholarly journals Fish larvae exploit edge vortices along their dorsal and ventral fin folds to propel themselves

2016 ◽  
Vol 13 (116) ◽  
pp. 20160068 ◽  
Author(s):  
Gen Li ◽  
Ulrike K. Müller ◽  
Johan L. van Leeuwen ◽  
Hao Liu
Keyword(s):  
Larval Fish ◽  
Fish Larvae ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Reynolds Numbers ◽  
Bony Fish ◽  
The Body ◽  
Functional Explanation ◽  
Image Velocimetry ◽  
Median Fins

Larvae of bony fish swim in the intermediate Reynolds number ( Re ) regime, using body- and caudal-fin undulation to propel themselves. They share a median fin fold that transforms into separate median fins as they grow into juveniles. The fin fold was suggested to be an adaption for locomotion in the intermediate Reynolds regime, but its fluid-dynamic role is still enigmatic. Using three-dimensional fluid-dynamic computations, we quantified the swimming trajectory from body-shape changes during cyclic swimming of larval fish. We predicted unsteady vortices around the upper and lower edges of the fin fold, and identified similar vortices around real larvae with particle image velocimetry. We show that thrust contributions on the body peak adjacent to the upper and lower edges of the fin fold where large left–right pressure differences occur in concert with the periodical generation and shedding of edge vortices. The fin fold enhances effective flow separation and drag-based thrust. Along the body, net thrust is generated in multiple zones posterior to the centre of mass. Counterfactual simulations exploring the effect of having a fin fold across a range of Reynolds numbers show that the fin fold helps larvae achieve high swimming speeds, yet requires high power. We conclude that propulsion in larval fish partly relies on unsteady high-intensity vortices along the upper and lower edges of the fin fold, providing a functional explanation for the omnipresence of the fin fold in bony-fish larvae.

Multi-functional pollution mitigation in a rehabilitated mangrove conservation area

2009 ◽  
Vol 35 (5) ◽  
pp. 898-907 ◽  
Author(s):  
Sriyani Wickramasinghe ◽  
Maurizio Borin ◽  
Sarath W. Kotagama ◽  
Roland Cochard ◽  
Alfredo J. Anceno ◽  
...  
Keyword(s):  
Conservation Area ◽  
Pollution Mitigation ◽  
Mangrove Conservation

Risk factors associated with Enteromyxum scophthalmi (Myxozoa) infection in cultured turbot, Scophthalmus maximus (L.)

Parasitology ◽  
2006 ◽  
Vol 133 (4) ◽  
pp. 433-442 ◽  
Author(s):  
M. I. QUIROGA ◽  
M. J. REDONDO ◽  
A. SITJÀ-BOBADILLA ◽  
O. PALENZUELA ◽  
A. RIAZA ◽  
...  
Keyword(s):  
Risk Factors ◽  
Distribution Pattern ◽  
Control Strategies ◽  
Host Density ◽  
Scophthalmus Maximus ◽  
Fish Distribution ◽  
Fish Mortality ◽  
Infection Prevalence ◽  
Western Spain ◽  
Turbot Scophthalmus Maximus

An epidemiological cohort study of Enteromyxum scophthalmi in cultured turbot was performed on a farm in North Western Spain. Four different ongrowing stocks (A, B, C, D) were monitored monthly until market size. Fish from stocks C and D were divided into 2 subgroups, receiving filtered (CF and DF) or unfiltered (CUF and DUF) water. The lack of water filtration was positively associated with infection prevalence, as all fish kept in filtered water remained uninfected. Parasite abundance varied seasonally (P<0·05) in stock B and subgroup CUF. Infection was also associated (P<0·05) with host weight, and the highest prevalences and intensities were detected in 101–200 g and 201–300 g fish. Distribution pattern of E. scophthalmi in subgroups CUF and DUF had a variance higher than the mean, indicating overdispersion. The minimum period necessary for the first detection of the parasite and for the appearance of disease symptoms and mortality, varied depending on the stock and introduction date, although a long pre-patent period was always observed. Several factors, such as host density, parasite recruitment and parasite-induced fish mortality can contribute to the observed distribution pattern. Risk factors found to be associated with E. scophthalmi infection, including water quality and accumulation of infective stages in the culture tanks, should be considered when designing control strategies to prevent the introduction and spread of infective stages in the facilities.

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