scholarly journals ANALISIS KECEPATAN FILTRASI DENGAN JENIS PAKAN YANG BERBEDA TERHADAP KELANGSUNGAN HIDUP SPAT KERANG MUTIARA (Pinctada maxima)

2018 ◽  
Vol 8 (1) ◽  
pp. 23-31
Author(s):  
Muhammad Maizi Diploma Putra ◽  
Nunik Cokrowati ◽  
Muhammad Masyarul Rusdani
Keyword(s):  
Clearance Rate ◽  
Filtration Rate ◽  
Isochrysis Galbana ◽  
Pavlova Lutheri ◽  
Pinctada Maxima

         Penelitian ini bertujuan untuk mengetahui kecepatan filtrasi kerang mutiara dengan jenis pakan yang berbeda, untuk selanjutnya ditentukan jenis pakan yang disukai oleh spat kerang mutiara (Pinctada maxima). Penelitian ini dilaksanakan di PT. Autore Pearl Culture, Kecamatan Pemenang, Kabupaten Lombok Utara, NTB pada tanggal 25 April hingga 25 Mei 2017. Penelitian ini menggunakan faktor uji jenis pakan yang berbeda, masing-masing faktor uji terdiri dari 3 perlakuan yaitu pemberian pakan alami dengan jenisIsochrysis galbana, Pavlova lutheri, Chaetoceros sp., dengan kepadatan 270.000 sel/ml. Setiap unit percobaan selanjutnya disusun dalam Rancangan Acak Lengkap (RAL), dengan media pemeliharaan berupa toples plastik volume 5000 ml. Pemeliharaan dilakukan selama 30 hari. Parameter yang diamati adalah clearance rate, filtration rate, aktivitas makan, tingkat konsumsi pakan dan tingkat kelangsungan hidup. Data dianalisis menggunakan analisis sidik ragam (ANOVA) dengan taraf nyata 5%. Hasil penelitian menunjukkan bahwa kecepatan filtrasi dengan pemberian jenis pakan yang berbeda selama pemeliharaan spat kerang mutiara (P. maxima) memberikan pengaruh nyata (p<0,05) terhadap kelangsungan hidup spat. Dengan nilai kelangsungan hidup rata-rata tertinggi diperoleh dari pemberian pakan Chaetoceros sp. yaitu sebesar 76.67% ±19.66 dibandingkan dengan pemberian Isochrysis galbana, Pavlova lutheri.

scholarly journals Effect of microalgal diets on filtration and ingestion rates of the rotifer Brachionus plicatilis

2016 ◽  
Vol 63 (3) ◽  
Author(s):  
Jayasree Loka ◽  
K.K. Philipose ◽  
S.M. Sonali
Keyword(s):  
Filtration Rate ◽  
Brachionus Plicatilis ◽  
Ingestion Rate ◽  
Initial Density ◽  
Isochrysis Galbana ◽  
Nannochloropsis Oculata ◽  
Ingestion Rates ◽  
Significant Difference ◽  
Rotifer Brachionus Plicatilis ◽  
Chaetoceros Calcitrans

Effect of marine microalgal diet on filtration and ingestion rates of Brachionus plicatilis was studied. Marine microalgae viz., Nannochloropsis oculata, Isochrysis galbana, Chaetoceros calcitrans and a combination of N. oculata and I. galbana (Nanno+Iso) at different cell concentrations were selected for the experiment and triplicates were maintained for each feed. Significant difference (p<0.05) was observed in the filtration and ingestion rates of B. plicatilis, between the treatments. Peak filtration rate of 12.2x10-5 cells ml-1 ind-1 min-1 was recorded in B. plicatilis fed with Nanno+Iso, followed by I. galbana. Ingestion rate was found to be significantly high (p<0.05) for those fed with C. calcitrans, followed by Nanno+Iso. Filtration rate was significantly high (p<0.05) in rotifers stocked at an initial density of 50 nos. ml-1 fed with Nanno+Iso. The results indicated that a combination of Nanno and Iso is the best suitable microalgal diet for rotifer with peak filtration (12.2x10-5cells ml-1 ind-1 min-1) and ingestion (5.4x10-3 cells ml-1 ind-1 min-1) rates during the first 60 min.

scholarly journals Tiakina Kia Ora: Protecting Our Freshwater Mussels

2021 ◽  
Author(s):  
◽  
Hannah Jane Rainforth
Keyword(s):  
Organic Matter ◽  
Clearance Rate ◽  
Filtration Rate ◽  
Rejection Rate ◽  
Ecological Knowledge ◽  
Management Framework ◽  
Sediment Loads ◽  
Suspended Sediment Concentrations ◽  
Local Species ◽  
Survival And Growth

<p>Matauranga (traditional ecological knowledge) built up by Whanganui iwi during their long association with the Whanganui River provides information on local biota and anthropological changes to the river. This matauranga records a decline in one local species, the kakahi (Echyridella menziesii (Gray, 1843)). Reasons suggested for this decline include alterations to flow and desiccation following a hydropower scheme, sedimentation, domestic and agricultural pollution, gravel extraction and channel modification. Decline was confirmed by a survey of historic kakahi beds: decline was evident at 16 (73%) of 22 sites. Of those 16 sites, there were 7 sites where decline was so severe that the population had been extirpated. Of the 15 historic beds where kakahi are still extant, four (27%) were remnant populations. Evidence of recruitment was found at only four (27%) of the 15 extant populations, or 18% of the total number of sites searched. Effect of suspended sediment concentrations ranging from 5.5 to 1212 mg.L-1 on ka kahi feeding behaviour and physiology was explored. Both filtration rate and rejection rate increased with increased sediment load (from 1.62 mg.h-1 to 190.88 mg.h-1 and from 0.62 to 201.53 mg.h-1 respectively) but clearance rate decreased with sediment increase (from 0.42 to 0.20 L.h-1). Behaviour was unaffected, with kakahi filtering on average 78% of the time. As particulate organic matter increased, clearance rate decreased and filtration rate increased. Filtration rate declined with increasing % organic matter. Kakahi can continue feeding under very high sediment loads for short periods. Much remains uncertain about kakahi, from their early biology to reasons for decline. Restoration options were explored using an adaptive management framework within which different hypotheses can be trialled in an experimental manner. This proved difficult due to confounding factors. However, given the established link between vegetation clearance and sedimentation, an initial restoration focus which evaluates catchment revegetation and its impact on kakahi survival and growth is suggested.</p>

Glomerular filtration changes during vasotocin-induced antidiuresis in kelp gulls

1988 ◽  
Vol 255 (6) ◽  
pp. R936-R939
Author(s):  
D. A. Gray ◽  
T. Erasmus
Keyword(s):  
Glomerular Filtration Rate ◽  
Linear Relationship ◽  
Glomerular Filtration ◽  
Water Permeability ◽  
Clearance Rate ◽  
Intravenous Infusion ◽  
Filtration Rate ◽  
Plasma Clearance ◽  
Plasma Concentrations ◽  
Arginine Vasotocin

In conscious kelp gulls, intravenous infusion of arginine vasotocin (AVT) at rates of 0.03, 0.1, 0.3, and 1.0 ng.kg-1.min-1 resulted in a linear relationship between the log values of the AVT plasma concentrations (measured by radioimmunoassay) and the infusion rates, which indicated a plasma clearance rate for AVT of 15.4 ml.min-1.kg-1 when endogenous AVT formation is considered. Evaluation of the renal actions of AVT at each dose level showed that antidiuresis was consistently associated with reductions in glomerular filtration rate as well as changes in tubule water permeability. Thus the water-conserving action of plasma AVT on the kelp gull kidney involves contributions from both glomerular and tubular mechanisms over the entire physiological range found in these birds.

scholarly journals Efek Perbedaan Kerapatan Media Substrat Terhadap Proses Penempelan Larva Tiram Mutiara (Pinctada maxima)

2018 ◽  
Vol 11 (1) ◽  
pp. 61
Author(s):  
Raismin Kotta
Keyword(s):  
Isochrysis Galbana ◽  
Pinctada Maxima

Usaha budidaya kerang mutiara lebih banyak terarah pada kegiatan pembesaran dan produksi mutiara, sehingga kebutuhan akan spat sebagai bahan baku utama semakin meningkat. Penelitian telah dilakukan pada bulan oktober 2017 di Laboratorium Balai Pengembangan Perikanan Pantai Sekotong Lombok Barat menggunakan metoda eksperimen.Tujuan Penelitian ini adalah untuk mengetahui perbandingan kerapatan media kolektor yang berbeda terhadap proses penempelan yang lebih efektif pada larva tiram mutiara fase plantygrade di laboratorium. Hasil yang di peroleh pada perlakuan P2 Media substrat/kolektor kerapatan 80% sangat baik dan cukup padat yaitu sebanyak 370 ekor spat/substrat. Sedangkan penempelan spat terendah ditemukan pada perlakuan P1 Media kolektor kerapatan 50% sebanyak 217 ekor spat/substrat. Dapat disimpulkan bahwa semakin lebar kerapatan media kolektor maka semakin kecil proses penempelan larva fase plantygrade. Berdasarkan analisis statistik bahwa kerapatan 50% perlakuan P1 dan perlakuan P2 menunjukan adanyan berbeda nyata, dimana Thitung (1,561) < Ttabel (2.228) ini berarti penempelan larva menggunakan substrat/kolektor kerapatan 50% dengan 80% yang berbeda tetapi tidak berpengaruh pada penempelan larva tiram mutiara fase plantygrade. Hasil pengamatan nilai rata-rata kualitas perairan seperti; Suhu 28,9 0C, pH 7,1, Salinitas 33 ppt, dan DO 5,9  ppm. Pemberian jenis pakan alami terhadap tiram mutiara pada fase plantygrade antara lain yaitu fitoplankton jenis  Isochrysis galbana, Chaetoceros simplex dan Nannoclhoropsis sp.

scholarly journals Tiakina Kia Ora: Protecting Our Freshwater Mussels

2021 ◽  
Author(s):  
◽  
Hannah Jane Rainforth
Keyword(s):  
Organic Matter ◽  
Clearance Rate ◽  
Filtration Rate ◽  
Rejection Rate ◽  
Ecological Knowledge ◽  
Management Framework ◽  
Sediment Loads ◽  
Suspended Sediment Concentrations ◽  
Local Species ◽  
Survival And Growth

<p>Matauranga (traditional ecological knowledge) built up by Whanganui iwi during their long association with the Whanganui River provides information on local biota and anthropological changes to the river. This matauranga records a decline in one local species, the kakahi (Echyridella menziesii (Gray, 1843)). Reasons suggested for this decline include alterations to flow and desiccation following a hydropower scheme, sedimentation, domestic and agricultural pollution, gravel extraction and channel modification. Decline was confirmed by a survey of historic kakahi beds: decline was evident at 16 (73%) of 22 sites. Of those 16 sites, there were 7 sites where decline was so severe that the population had been extirpated. Of the 15 historic beds where kakahi are still extant, four (27%) were remnant populations. Evidence of recruitment was found at only four (27%) of the 15 extant populations, or 18% of the total number of sites searched. Effect of suspended sediment concentrations ranging from 5.5 to 1212 mg.L-1 on ka kahi feeding behaviour and physiology was explored. Both filtration rate and rejection rate increased with increased sediment load (from 1.62 mg.h-1 to 190.88 mg.h-1 and from 0.62 to 201.53 mg.h-1 respectively) but clearance rate decreased with sediment increase (from 0.42 to 0.20 L.h-1). Behaviour was unaffected, with kakahi filtering on average 78% of the time. As particulate organic matter increased, clearance rate decreased and filtration rate increased. Filtration rate declined with increasing % organic matter. Kakahi can continue feeding under very high sediment loads for short periods. Much remains uncertain about kakahi, from their early biology to reasons for decline. Restoration options were explored using an adaptive management framework within which different hypotheses can be trialled in an experimental manner. This proved difficult due to confounding factors. However, given the established link between vegetation clearance and sedimentation, an initial restoration focus which evaluates catchment revegetation and its impact on kakahi survival and growth is suggested.</p>

scholarly journals EFFECTS OF CURRENT VELOCITY ON FILTRATION AND INGESTION RATE OF PEARL OYSTER (Pinctada maxima)

2012 ◽  
Vol 7 (2) ◽  
pp. 123
Author(s):  
Apri I. Supii ◽  
Dewi Puji Lestari ◽  
Sudewi Sudewi
Keyword(s):  
Current Velocity ◽  
Filtration Rate ◽  
Block Design ◽  
Ingestion Rate ◽  
General Pattern ◽  
Pearl Oyster ◽  
Filter Feeder ◽  
Randomized Block Design ◽  
Suspension Filtration ◽  
Pinctada Maxima

Pinctada maxima is a filter feeder organism obtaining food particles by filtration from water suspension. Filtration and ingestion rate of a large number of benthic filter feeders in a variety of coastal environment have been known influenced by current velocity. The purposes of this study were to examine the effects of current velocity on filtration and ingestion rate of pearl oyster P. maxima and to determine the best current velocity. Randomized Block Design was used in this experiment with four current treatments of 8, 16, 24, and 32 cm s-1. The results of this experiment demonstrated that current velocity has a marked effect on filtration rate of P. maxima and that this species follows the general pattern of response observed for other bivalves. Different velocity affected filtration and ingestion rate in pearl oyster P. maxima. It was gradual decline in the suspension feeding with increasing velocity. Filtration rate of bivalves with siphons facing into the current, were directly inhibited by hydrodynamic effects on the functioning of the bivalves pump. At increasing current velocity, pressures applied to the inhalant and exhalant aperture facing into the flow would result in higher pressures than that of produced by the ciliary pump, resulting in reduced filtration rate. The highest filtration and ingestion rate in this experiment were obtained at velocity of 8 cm s-1 that achieved 3.409±0.485 l/h and 37.91±1.27 (x107) cells/h, respectively.

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