Academic literature on the topic 'Cherax quadricarinatus'
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Journal articles on the topic "Cherax quadricarinatus"
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Bochow, Shaun, Kelly Condon, Jennifer Elliman, and Leigh Owens. "First complete genome of an Ambidensovirus; Cherax quadricarinatus densovirus, from freshwater crayfish Cherax quadricarinatus." Marine Genomics 24 (December 2015): 305–12. http://dx.doi.org/10.1016/j.margen.2015.07.009.
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Iqbal, Martin Ali, Isdradjad Setyobudiandi, Majariana Krisanti, and Yusli Wardiatno. "Egg Production of Cherax quadricarinatus (von Martens, 1868) in Lido Lake, West Java." Journal of Tropical Fisheries Management 3, no. 2 (November 25, 2019): 45–52. http://dx.doi.org/10.29244/jppt.v3i2.30561.
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Cherax quadricarinatus merupakan salah satu komoditas penting perikanan di Danau Lido, namun spesies ini sering menjadi invasif. Produksi telur digunakan sebagai informasi dasar pengelolaan lobster air tawar di Danau Lido. Penelitian ini bertujuan untuk menganalisis produksi telur lobster air tawar Cherax quadricarinatus di perairan Danau Lido Bogor, Provinsi Jawa Barat. Penelitian ini dilakukan pada bulan Desember 2017 hingga Februari 2018 dengan jumlah sampel sebanyak 101 ekor betina. Pola pertumbuhan Cherax quadricarinatus berdasarkan uji-t adalah alometrik negatif. Panjang karapas yang berbeda berpengaruh nyata terhadap jumlah telur total. Jumlah telur rata-rata yang dihasilkan selama tiga bulan pengambilan contoh yaitu 212 ± 65 butir telur. Volume telur rata-rata yang dihasilkan yaitu 4,2376± 1,2270 mm3 dan diameter telur rata-rata yang dihasilkan yaitu 1,9919± 0,1869 mm.
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Kusmini, Irin Iriana, Estu Nugroho, Alimuddin Alimuddin, and Mulyasari Mulyasari. "KARAKTERISTIK GENOTIPE HIBRIDA HUNA BIRU (Cherax albertisii) DENGAN HUNA CAPITMERAH (Cherax quadricarinatus)." Jurnal Riset Akuakultur 5, no. 2 (November 25, 2016): 191. http://dx.doi.org/10.15578/jra.5.2.2010.191-197.
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Pada pengelolaan induk di hatchery sering terjadi silang dalam (inbreeding) yang dapat menyebabkan terjadinya penurunan keragaman genetik. Salah satu program untuk meningkatkan keragaman genetik adalah dengan hibridisasi. Penelitian bertujuan untuk mengetahui keragaman genetik turunan persilangan antara huna biru Cherax albertisii dengan huna capitmerah Cherax quadricarinatus. Metode penelitian menggunakan analisis RAPD (Randomly Amplified Polymorphism DNA). Hasil penelitian menunjukkan nilai heterozigositas hibrida lebih tinggi (0,187-0,290) dibanding nonhibrida (0,0997-0,2211). Hibridisasi antara jantan huna capitmerah dengan betina huna biru (RA) menghasilkan nilai heterozigositas yang lebih tinggi dibandingkan dengan persilangan antara betina huna capitmerah dengan jantan huna biru (AR).Management of fish broodstock in hatchery can reduced genetic variation. One program that can be conducted to increase the genetic variation is hibridization. The aim of this research was to find out genetic variation (heterozigosity) of the offspring of Cherax albertisii-Cherax quadricarinatus hybrid. The methods used in this research was RAPD analysis (Random Amplified Polymorphism DNA). The result showed that heterozigosity value of hybrid (0.187-0.290) was higher than that of non hybrid (0.0997-0.2211). Hybridization of redclaw male with blue crayfish female (RA) gave better result in heterozigosity value and genetic distance than that of redclaw female with blue crayfish male (AR).
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Budiardi, Tatag, D. Y. Irawan, and Dinamella Wahjuningrum. "Growth and Survival Rate of Redclaw Crayfish Cherax quadricarinatus Reared with Different Density in Recirculation System." Jurnal Akuakultur Indonesia 7, no. 2 (July 1, 2008): 109. http://dx.doi.org/10.19027/jai.7.109-114.
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<p>The objective of this research was to know the growth and survival rate of redclaw crayfish (<em>Cherax quadricarinatus</em>) reared in recirculation system with density 20, 30, 40 and 50 m<sup>-2</sup>. Lobster with 6.02 ± 0.13 cm length and 6.23 ± 0.51 gram initial body weights were cultured in 60 x 30 x 40 cm aquarium and compiled in recirculation system, for 42 days. Result of research showed that there are statistically difference at growth rate daily weight, coefficient of variances and feed efficiency (p0.05). From this research it can be concluded that the best density for freshwater crayfish (<em>Cherax quadricarinatus</em>)<em> </em>was 50 m<sup>-2</sup>.</p><p>Keywords: density, growth, survival rate, redclaw crayfish, <em>Cherax quadricarinatus</em></p><p> </p><p>ABSTRAK</p><p>Penelitian ini bertujuan untuk mengetahui pertumbuhan dan kelangsungan hidup lobster capit merah (<em>Cherax quadricarinatus</em>) yang dipelihara pada sistem resirkulasi dengan kepadatan 20, 30, 40 dan 50 ekor/m<sup>2</sup>. Benih lobster yang digunakan memiliki panjang awal rata-rata 6,02 ± 0,13 cm dan berat 6,23 ± 0,51 gram, dipelihara pada akuarium dengan ukuran 60 x 30 x 40 cm yang diisi air setinggi 20 cm dan disusun dalam sistem resirkulasi, selama 42 hari. Hasil penelitian menunjukkan bahwa terdapat perbedaan nyata pada laju pertumbuhan bobot harian, koefisien keragaman dan efisiensi pakan (p0,05). Dari hasil penelitian ini, dapat disimpulkan bahwa padat penebaran yang dapat memberikan hasil maksimum adalah 50 ekor/m<sup>2</sup>.</p>Kata kunci: padat penebaran, pertumbuhan, kelangsungan hidup, lobster capit merah, <em>Cherax quadricarinatus</em>
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Suprapto, Hari, Sudarno Sudarno, and Istikhara Mentari Tito. "Isolasi dan Identifikasi Bakteri Kitinolitik yang terdapat pada Cangkang Lobster Air Tawar (Cherax Quadricarinatus) [Isolation and Identification of Chytinolitic Bacteria from The Crayfish (Cherax Quadricarinatus) Shell]." Jurnal Ilmiah Perikanan dan Kelautan 8, no. 1 (January 13, 2019): 16. http://dx.doi.org/10.20473/jipk.v8i1.11186.
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AbstrakIndonesia memiliki potensi perikanan yang sangat tinggi, salah satunya adalah lobster. Ekspor lobster air tawar cenderung meningkat tiap tahun. Total ekspor hasil lobster budidaya mencapai 94.511 ton/tahun. Pangsa pasar lobster air tawar tidak hanya terbatas di dalam negeri saja tetapi juga ke luar negeri. Penelitian ini bertujuan untuk mengetahui adanya bakteri kitinolitik dan juga jenis-jenis bakteri kitinolitik yang terdapat pada cangkang lobster air tawar. Penelitian ini menggunakan Penelitian ini menggunakan metode observasi untuk mengetahui adanya bakteri kitinolitik yang ada pada cangkang lobster air tawar. Data yang digunakan dalam penelitian ini adalah secara deskriptif. Data yang diperoleh dianalisis secara deskriptif yaitu penyajian data tentang morfologi dan karakteristik dari bakteri kitinolitik yang diisolasi dari cangkang lobser air tawar (Cherax quadricarinatus) dan dibandingkan dengan morfologi dan karakteristik bakteri kitinolitik dengan literatur yang sesuai. Hasil penelitian ini adalah diperoleh bahwa bakteri yang diisolasi dari cangkang lobster air tawar (Cherax quadricarinatus) dapat tumbuh dan berkembang pada media uji. Kemudian hasil uji hidrolisis bakteri kitinolitik ditandai dengan adanya zona bening yang dihasilkan dari bakteri tersebut. Dari hasil pengujian tersebut didapatkan jenis – jenis bakteri yaitu Aeromonas sp., Bacillus sp. dan Pseudomonas sp. AbstractIndonesia have highest potential of fishery. One of them is Lobster. It has increasing slightly, approximately 94.511 ton/years. The aims this research to determine the presence of chitinolytic bacteria and identify its species in crayfish shells. This research was performed via observation method to determine the presence of chitinolytic bacteria, which are exist in crayfish (cherax quadricarinatus) shell. The data used in this research is descriptive. The data descriptively analyzed represented the morphology and characteristics of chitinolytic bacteria isolated from crayfish (Cherax quadricarinatus) and comparison the morphology and characteristics of chitinolytic bacteria with appropriate literature. These results obtained that the bacteria isolated from crayfish (Cherax quadricarinatus) shell can grow and develop in the test medium. Then, chitinolytic activity was signed by the formation of clear zone on the test medium. The results obtained several bacterium species including Aeromonas sp., Bacillus sp. and Pseudomonas sp.
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Wahono, Fandi, Agustono Agustono, and Mirni Lamid. "EFEK PENAMBAHAN L-KARNITIN PADA PAKAN TERHADAP LAJU PERTUMBUHAN BENIH LOBSTER AIR TAWAR (Cherax qudricarinatus)." Journal of Aquaculture and Fish Health 3, no. 1 (April 29, 2019): 8. http://dx.doi.org/10.20473/jafh.v3i1.12984.
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Lobster Air Tawar (Cherax quadricarinatus) merupakan salah satu komoditas perikanan yang bernilai ekonomis tinggi, baik untuk lobster konsumsi ataupun lobster hias. Kebutuhan Lobster Air Tawar konsumsi semakin meningkat, namun produksinya masih sangat rendah sehingga harga di pasaran relatif tinggi. Pakan merupakan salah satu komponen budidaya yang sangat besar peranannya sebagai faktor penentu pertumbuhan maupun dari segi biaya produksi. Hasil penelitian menunjukkan bahwa udang putih yang diberi pakan dengan tambahan 500 ppm L-karnitin menunjukkan pertumbuhan yang optimal. Adanya penelitian tentang L-karnitin yang mampu meningkatkan pertumbuhan udang putih maka diharapkan juga mampu meningkatkan pertumbuhan Lobster Air Tawar. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan L-karnitin pada pakan terhadap pertumbuhan benih Lobster Air Tawar (Cherax quadricarinatus). Metode penelitian ini adalah eksperimen dengan Rancangan Acak Lengkap (RAL). Hasil penelitian ini menunjukkan bahwa pemberian dosis L-karnitin yang berbeda pada pakan buatan menghasilkan laju pertumbuhan harian dan efisiensi pakan yang berbeda nyata (p<0,05). Pertumbuhan benih Lobster Air Tawar (Cherax quadricarinatus) terbaik pada perlakuan D sebesar 0,72 gr/hari, dan efisiensi pakan terbaik pada perlakuan D sebesar 90,68%.
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Mauro, Manuela, Vincenzo Arizza, Marco Arculeo, Alessandro Attanzio, Paola Pinto, Pietro Chirco, Giampaolo Badalamenti, Luisa Tesoriere, and Mirella Vazzana. "Haemolymphatic Parameters in Two Aquaculture Crustacean Species Cherax destructor (Clark, 1836) and Cherax quadricarinatus (Von Martens, 1868)." Animals 12, no. 5 (February 22, 2022): 543. http://dx.doi.org/10.3390/ani12050543.
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In the last few years, there has been a notable development in the breeding of freshwater shrimp (astaciculture), which involved various species and in particular, the two Australian Parastacidae species, Cherax destructor and Cherax quadricarinatus. Information about the haemolymphatic parameters of these two species is fragmentary, and filling these gaps becomes important given their importance in aquaculture. Cellular and biochemical parameters were analyzed in both species to create a reference baseline for these parameters to identify the state of welfare or suffering of these animals. The results showed that the total haemocyte count, haemocyte subpopulations, enzymatic activities and pH are similar between the two species, while total protein and osmolality are higher in C. destructor than C. quadricarinatus. Knowledge of these parameters could assist in evaluating the good health status of these species kept in aquaculture facilities.
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Subbotina, Julia M., and Matvey S. Poilov. "VETERINARY-SANITARY CHARACTERISTICS OF THE CHERAX QUADRICARINATUS." Problems of veterinary sanitation, hygiene and ecology 4, no. 44 (2022): 485–89. http://dx.doi.org/10.36871/vet.san.hyg.ecol.202204012.
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The article raises the issue of veterinary and sanitary cultivation of Australian red-tick crayfish (Cherax quadricarinatus) in artificial conditions. The methods of growing Australian crayfish in aquarium conditions in a closed water supply installation are considered. Hydrochemical, organoleptic and microbiological parameters of water are considered when growing Australian crayfish in artificial conditions.
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Parnes, Shmuel, and Amir Sagi. "Intensification of redclaw crayfish Cherax quadricarinatus culture." Aquacultural Engineering 26, no. 4 (November 2002): 251–62. http://dx.doi.org/10.1016/s0144-8609(02)00034-1.
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Manor, Rivka, Ran Segev, Marcia Pimenta Leibovitz, Eliahu D. Aflalo, and Amir Sagi. "Intensification of redclaw crayfish Cherax quadricarinatus culture." Aquacultural Engineering 26, no. 4 (November 2002): 263–76. http://dx.doi.org/10.1016/s0144-8609(02)00035-3.
Full textDissertations / Theses on the topic "Cherax quadricarinatus"
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Garza, de Yta Antonio Rouse David B. "Hatchery, nursery, nutrition and stock evaluation of redclaw crayfish Cherax quadricarinatus." Auburn, Ala, 2009. http://hdl.handle.net/10415/1851.
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Pavasovic, Ana. "Evaluation of the nutritional requirements of redclaw crayfish, Cherax quadricarinatus." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/16615/1/Ana_Pavasovic_Thesis.pdf.
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Aquaculture represents a sustainable alternative to natural fisheries for provision of high quality, animal protein. Crustaceans make a significant contribution to global aquaculture production, of which decapods are the most economically important group. Among freshwater crayfish, the genus Cherax includes several species that have emerged as important culture species. A suite of favourable biological attributes, including fast growth and an omnivorous feeding habit, have contributed to establishment of successful culture of Cherax quadricarinatus (redclaw) in many countries. Aspects of redclaw production, however, remain relatively undeveloped, in particular feed formulation. To better understand the digestive processes and nutritional requirements of redclaw, this study examined the relationship between diet composition and digestive enzyme activity, growth performance and diet digestibility coefficients.
The extent to which redclaw can efficiently utilise complex polysaccharides, such as cellulose, has been speculated on by authors who reported endogenous cellulase activity in this species. I evaluated the use of insoluble α-cellulose by redclaw, demonstrated that high dietary levels (30%) can significantly reduce the specific activity of selected digestive enzymes (amylase and cellulase), while also lowering apparent digestibility coefficients. Inclusion of α-cellulose above 12% also significantly reduced survival rate, specific growth rate and feeding efficiency in this organism which corresponds with low tolerance for insoluble fibre by other decapods. Even though redclaw possess endogenous cellulases, they appear to have only a limited capacity to utilise insoluble fibre in their diets.
Further, I assessed the impact of different nutrient profiles on digestive enzyme activity, growth and tail muscle composition in redclaw. Purified diets containing varying levels of dietary protein significantly affected activity of digestive enzymes (protease, amylase and cellulase) and the composition of the tail muscle tissue. Redclaw have a relatively low protein requirement, which was reflected here, as little significant difference was observed in growth rates and the feed conversion ratio was only significantly affected by the lowest protein diet. Manipulation of the non-protein energy component in purified diets (protein to lipid ratio) had no effect on growth performance indices in redclaw. Digestive enzyme activity (protease) was however, strongly influenced by both the amount of protein and lipid in the diet and a significant correlation was observed between protease activity and growth performance indices. The findings here, provide preliminary data for consideration of digestive enzymes such as proteases as potential growth indicators for freshwater crayfish. These enzymes are already recognised as reliable biological indicators for comparison of digestive efficiency and potential growth rate in fish. The relationship between diet composition and digestive enzyme expression observed here, stress the need for further empirical evaluation of specific ingredients in artificial diets for redclaw.
A range of single cell, plant and animal-based, agricultural products were assessed for their potential use in diets formulated for redclaw. Analysis of dietary supplements revealed that apparent digestibility of crude protein was generally higher for diets containing plant-based ingredients. A similar outcome was observed for digestibility coefficients of test ingredients. Ingredient type also had a significant effect on digestive enzyme activity. Importantly, a significant correlation was observed for enzyme activity and apparent digestibility coefficients. It appears that redclaw have the capacity to utilise nutrients from a broad range of dietary ingredients successfully including animal, single cell and in particular, plant matter in their diet.
Taken together, the results presented here demonstrate that digestive enzyme activities in redclaw are significantly influenced by diet composition. I show clearly that the ability of redclaw to utilise various nutrients (measured as digestibility coefficients) is highly correlated with digestive enzyme activity. Finally, protease activity demonstrated a potential for use as an indicator of redclaw growth performance. The data presented here will contribute to development of better and cheaper feed formulations for use in redclaw aquaculture and have broader applications to freshwater crustacean culture. In particular, the potential for use of plant-based ingredients in aqua-feeds for redclaw will contribute to a more economically and environmentally sustainable redclaw culture.
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Pavasovic, Ana. "Evaluation of the nutritional requirements of redclaw crayfish, Cherax quadricarinatus." Queensland University of Technology, 2008. http://eprints.qut.edu.au/16615/.
Full textAbstract:
Aquaculture represents a sustainable alternative to natural fisheries for provision of high quality, animal protein. Crustaceans make a significant contribution to global aquaculture production, of which decapods are the most economically important group. Among freshwater crayfish, the genus Cherax includes several species that have emerged as important culture species. A suite of favourable biological attributes, including fast growth and an omnivorous feeding habit, have contributed to establishment of successful culture of Cherax quadricarinatus (redclaw) in many countries. Aspects of redclaw production, however, remain relatively undeveloped, in particular feed formulation. To better understand the digestive processes and nutritional requirements of redclaw, this study examined the relationship between diet composition and digestive enzyme activity, growth performance and diet digestibility coefficients. The extent to which redclaw can efficiently utilise complex polysaccharides, such as cellulose, has been speculated on by authors who reported endogenous cellulase activity in this species. I evaluated the use of insoluble α-cellulose by redclaw, demonstrated that high dietary levels (30%) can significantly reduce the specific activity of selected digestive enzymes (amylase and cellulase), while also lowering apparent digestibility coefficients. Inclusion of α-cellulose above 12% also significantly reduced survival rate, specific growth rate and feeding efficiency in this organism which corresponds with low tolerance for insoluble fibre by other decapods. Even though redclaw possess endogenous cellulases, they appear to have only a limited capacity to utilise insoluble fibre in their diets. Further, I assessed the impact of different nutrient profiles on digestive enzyme activity, growth and tail muscle composition in redclaw. Purified diets containing varying levels of dietary protein significantly affected activity of digestive enzymes (protease, amylase and cellulase) and the composition of the tail muscle tissue. Redclaw have a relatively low protein requirement, which was reflected here, as little significant difference was observed in growth rates and the feed conversion ratio was only significantly affected by the lowest protein diet. Manipulation of the non-protein energy component in purified diets (protein to lipid ratio) had no effect on growth performance indices in redclaw. Digestive enzyme activity (protease) was however, strongly influenced by both the amount of protein and lipid in the diet and a significant correlation was observed between protease activity and growth performance indices. The findings here, provide preliminary data for consideration of digestive enzymes such as proteases as potential growth indicators for freshwater crayfish. These enzymes are already recognised as reliable biological indicators for comparison of digestive efficiency and potential growth rate in fish. The relationship between diet composition and digestive enzyme expression observed here, stress the need for further empirical evaluation of specific ingredients in artificial diets for redclaw. A range of single cell, plant and animal-based, agricultural products were assessed for their potential use in diets formulated for redclaw. Analysis of dietary supplements revealed that apparent digestibility of crude protein was generally higher for diets containing plant-based ingredients. A similar outcome was observed for digestibility coefficients of test ingredients. Ingredient type also had a significant effect on digestive enzyme activity. Importantly, a significant correlation was observed for enzyme activity and apparent digestibility coefficients. It appears that redclaw have the capacity to utilise nutrients from a broad range of dietary ingredients successfully including animal, single cell and in particular, plant matter in their diet. Taken together, the results presented here demonstrate that digestive enzyme activities in redclaw are significantly influenced by diet composition. I show clearly that the ability of redclaw to utilise various nutrients (measured as digestibility coefficients) is highly correlated with digestive enzyme activity. Finally, protease activity demonstrated a potential for use as an indicator of redclaw growth performance. The data presented here will contribute to development of better and cheaper feed formulations for use in redclaw aquaculture and have broader applications to freshwater crustacean culture. In particular, the potential for use of plant-based ingredients in aqua-feeds for redclaw will contribute to a more economically and environmentally sustainable redclaw culture.
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Bustos, Vergara Cristian Wladimir. "Desarrollo del gastrolito en langosta de tenaza roja, Cherax quadricarinatus (von Martens, 1868)." Tesis, Universidad de Chile, 2010. http://repositorio.uchile.cl/handle/2250/131181.
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Memoria para optar al Título Profesional de Médico VeterinarioGran variedad de seres vivos desarrollan sistemas capaces de crear estructuras mineralizadas, que se usan como protección, sostenimiento, alimentación, reservas de minerales, etc. La formación y degradación de estructuras minerales resulta ser un punto crítico en la fisiología de animales invertebrados como los crustáceos y en particular en el modelo animal utilizado en esta memoria de título, la langosta de tenaza roja, Cherax quadricarinatus, especie cuyo desarrollo está en íntima relación con la formación de una reserva mineral llamada gastrolito, que se fabrica en la parte anterior del estómago cardiaco, en una zona especializada de la pared estomacal, el disco del gastrolito, cuyo epitelio presenta distinta estructura según el momento del ciclo de muda y representa un excelente modelo para el estudio de la biomineralización. La matriz extracelular del gastrolito está formada por moléculas cargadas negativamente, entre las que se destacan los proteoglicanos, que son depositados por el epitelio formador. Los proteoglicanos serían los responsables de entregar un orden definido al depósito de carbonato de calcio amorfo que compone al gastrolito. La etapa del ciclo de muda se determinó por observación del exoesqueleto de los individuos, cuando éste era blando se clasificó en la etapa de postmuda y si estaba rígido en cualquiera de las otras dos etapas: intermuda o premuda. Para diferenciarlas se radiografiaron y en intermuda no se observó la imagen compatible con gastrolito y por el contrario, si fue posible observarlo en premuda. Se extrajeron estómagos de las langostas clasificadas, se procesaron de manera rutinaria para realizar cortes histológicos, los que fueron teñidos con las técnicas de hematoxilina-eosina y azul de alciano a pH 2,5; para describir zonas de interés y reconocer la presencia de glicosaminoglicanos, respectivamente. Además se utilizaron reacciones inmunohistoquímicas con el propósito de identificar temporal, espacial y específicamente algunos proteoglicanos presentes en la matriz orgánica del gastrolito. Se logró establecer un orden espacial y temporal para proteoglicanos específicos: Dermatán sulfato y condroitín-4-sulfato están presentes en los tres estados del ciclo de muda, observándose una mayor intensidad de reacción en las etapas de intermuda y premuda principalmente, lo que sugiere, al igual que en otros estudios similares, que serían necesarios para mantener el orden en el tipo de acumulación de carbonato de calcio en la formación de esta biocerámica. Condroitín-6-sulfato se muestra con una reacción más intensa en intermuda y premuda, disminuyendo su intensidad en postmuda, lo que sugiere una participación más activa durante la formación, luego en postmuda está ausente tanto en el epitelio formador como en el gastrolito en degradación y sólo se observa en el tejido conectivo subyacente al lugar de formación del gastrolito. Queratán sulfato presenta una mayor intensidad de reacción en intermuda y premuda principalmente, sugiriendo un rol en el inicio de la calcificación. En el periodo de postmuda se encuentra en el gastrolito principalmente y en el epitelio formador con menor intensidad. Esta distribución temporal de los proteoglicanos sugiere la influencia en el desarrollo de los gastrolitos de la langosta de tenaza roja
Financiamiento: Proyecto Fondap 11980002 y Proyecto ECOS-CONICYT C07-B02
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Xue, Xiaoming. "Enzymic studies of cellulase and xylanase from the digestive system of the redclaw crayfish Cherax quadricarinatus." Thesis, Queensland University of Technology, 1998. https://eprints.qut.edu.au/36965/1/36965_Xue_1998.pdf.
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The structural polysaccharide-degrading enzymes, cellulase and xylanase, in the digestive system of the freshwater redclaw crayfish, Cherax quadricarinatus were investigated in an attempt to elucidate the potential capacity of crayfish to utilise the cell wall components of plant material in their diet.
Cellulase, xylanase and lichenase were all found in the gastric juice, hindgut juice and hepatopancreas of the redclaw crayfish. The specific activities of cellulase and xylanase in the crayfish gastric juice were 2788 and 2060 units per ml, respectively. In contrast, cellulase and xylanase activities were only just detectable in the intestinal juice of the omnivorous Sea Garfish examined as a reference. Analysis of the relative activity of cellulase and xylanase in the different parts of the crayfish digestive tract showed that the foregut possessed total cellulase and xylanase activities 91-fold and 83-fold higher than the hindgut, respectively. This indicates that the foregut is the major organ involved in the digestion of dietary cellulose and xylan in the redclaw crayfish.
Treatment with antibiotics depressed bacterial populations in the gastric juice to very low levels, but only slightly reduced cellulase and xylanase activities. This result indicates that gastric hydrolases present in the redclaw crayfish are produced from the hepatopancreas.
Cellulase from crayfish gastric juice was active across a pH range of 4-9 with a pH optimum of 5. 5. The hepa topancreas cellulase had a similar pH profile to that found in gastric juice. The pH profile of crayfish xylanase was essentially the same as that of the cellulase. The optimum pH values for cellulase and xylanase activities in the redclaw fit well within the observed range of gastric juice pH values in this species. Crayfish cellulase was active across a temperature range of 10°C to 70°C with an optimum between 55°C and 60°C. Similarly, crayfish xylanase was active in a temperature range of 10°C to 65°C with an optimum temperature of 50°C. These results demonstrate the relatively broad stability of these enzymes across a wide range of environmental parameters.
Cellulase and xylanase activities in crayfish grown in an earthen pond were significantly lower than that of individuals raised in the laboratory and fed on a commercial pellet diet. Lower levels of cellulase and xylanase activities in the gastric juice of earthen-pond-reared crayfish were accompanied by lower levels of these enzymes in the hepatopancreas. Starvation resulted in a 2- to 3-fold reduction in gastric cellulase and xylanase activities, compared with crayfish fed on a commercial pellet diet. The significant reduction in hepatopancreatic levels of cellulase and xylanase activities was accompanied by a parallel decline in general protein content in starved crayfish, indicating a reduced level of general protein synthesis in the hepatopancreas associated with starvation.
Crayfish fed on a diet containing starch and milk (SM) had only slightly lower levels of cellulase and xylanase activities in the gastric juice, compared with a group fed on a commercial diet which contained 7% crude fibre. Cellulase levels in the hepatopancreas were also not significantly different between the two groups, although there was a significant decrease in the hepatopancreatic xylanase activity in the SM group. Cellulase and xylanase activities were significantly lower in the group fed on a starch and milk diet plus 25% fibre (cellulose and xylan) than in the commercial diet-fed crayfish. A marked decrease in the protein content of the hepatopancreas was also observed in this group. The activities of both cellulase and xylanase in juvenile crayfish (body wt. of 20-50 grams) were significantly higher (1.5-3-fold) than those of mature crayfish (body wt of 150-280 grams), indicating that the levels of these digestive enzymes may be positively related to growth rate. A positive relationship between growth rate and enzyme activity was also observed in a study using selected lines with fast growth compared with control lines. In a Gilbert River line selected for fast growth rate both the juvenile and adult crayfish possessed significantly higher cellulase and xylanase activities in gastric juice (1. 4-fold to 1. 9-fold higher) than control individuals. Similarly, higher activities (1.2-fold to 1. 7-fold higher) of both enzymes were seen in the hepatopancreas of the selected line. A parallel result (1. 3-fold to 4. 6-fold higher) was observed in selected vs control lines for Flinders River crayfish stocks.
These results suggest that redclaw crayfish produce cellulase and xylanase endogenously in the hepatopancreas, and these enzymes are secreted into the foregut of the animal. Both enzymes were present at very high levels in the gastric juice. Enzyme levels were inflated in lines selected for fast growth rate, but did not increase with increased fibre intake in the diet. The presence of high activities of these fibre-degrading enzymes in the digestive system indicates that the redclaw crayfish has a high capacity to utilise plant cell wall components. As a consequence it is suggested that addition of microbial fibredegrading enzymes to diets may not be necessary to promote crayfish growth.
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Poblete, Hevia Gonzalo Andrés. "Retrosíntesis biomimética en gastrolitos de Langosta Tenaza Roja (Cherax quadricarinatus) mediante técnica de mineralización usando polímeros sintéticos." Tesis, Universidad de Chile, 2009. http://repositorio.uchile.cl/handle/2250/131217.
Full textAbstract:
Memoria para optar al Título Profesional de Médico VeterinarioLa biomimética o mimetismo de lo biológico es una disciplina muy antigua que trata de imitar algo preexistente en la naturaleza, por lo tanto tiene como fuente de inspiración alguna característica o habilidad biológica de los organismos para generar materiales útiles para el ser humano. Debido a la necesidad del ser humano por alcanzar nuevos logros y seguir superando sus limitaciones son que la biomimética ha alcanzado la importancia tecnológica que tiene actualmente. Por tal razón numerosas investigaciones se han realizado con el objeto de dilucidar los diferentes mecanismos moleculares que permitan conocer como se forman estos biomateriales de origen biológico y obtener materiales más complejos con características superiores a las ya existentes. Dado al menor conocimiento que se tiene sobre los materiales amorfos, en la presente memoria de título se estudió un tipo de reserva inorgánico de tipo amorfo del carbonato de calcio (CaCO3) del crustáceo Cherax quadricarinatus llamado gastrolito. Cherax quadricarinatus es un crustáceo que vive en zonas de agua dulce y que presenta un exoesqueleto que muda constantemente. Los gastrolitos son concreciones altamente calcificadas, encontradas en la zona cardiaca del estómago de algunos Decápodos, que actúan como reservorios temporales formados por CaCO3 de tipo amorfo (CCA), material inorgánico crucial para el proceso de muda de su exoesqueleto y un excelente modelo de mineralización de CCA. En estudios de biomineralización se han usado variados tipos de aditivos para evaluar la participación de éstos en ensayos de cristalización in vitro de CaCO3. En esta memoria de título se utilizaron diferentes polímeros acídicos comerciales tales como: ácido fítico (AF), ácido poliaspártico (APS) y ácido poliacrílico (APA) en conjunto con sustratos (esponja y gastrogel) y proteoglicanos (PGS) de fracciones solubles (PG-FS) e insoluble (PG-FI) obtenidos a partir del gastrolitos como aditivos en la cristalización del CaCO3. Los ácidos AF, APS y APA son polímeros comerciales usados por el ser humano en diferentes procesos industriales y que han mostrado tener efectos modificadores sobre la cristalización del CaCO3. 7 El proceso in vitro de cristalización del CaCO3 fue el método de difusión de gases y las técnicas de caracterización de los cristales obtenidos fueron la microscopía electrónica de barrido (SEM) y la difracción de rayos X (XRD), con los cuales se pudo observar la morfología y determinar la estructura cristalina del CaCO3 obtenidos en las diferentes combinaciones ensayadas de polímeros, sustratos (esponja y gastrogel) y proteoglicanos de ambas fracciones (PG-FS; PG-FI) durante la cristalización de CaCO3. Encontramos que los sustratos esponja y gastrogel al ser usados como aditivos únicos en los ensayos de mineralización de CaCO3 mostraron una clara tendencia a la formación de estructuras amorfas y un efecto modulador mecánico del depósito cristalino. Con PG-FS se obtuvieron cristales de CaCO3 con morfología semejantes a los polimorfos de aragonita y calcita y estructuras cristalinas del tipo aragonita, calcita y vaterita, los cuales se determinaron mediante XRD. Sin embargo, con PG-FI se obtuvieron cristales con morfología similar a los polimorfos de aragonita y vaterita y se determinaron estructuras cristalinas del tipo aragonita, calcita y vaterita mediante XRD. Por otro lado, el uso de APA como único aditivo indujo la formación de estructuras cristalinas con morfologías esféricas observadas con SEM y estructuras cristalinas del tipo aragonita y calcita determinadas por XRD. Cuando el APS fue usado se observaron cristales con morfologías espiculadas y estructuras cristalinas del tipo aragonita, calcita y vaterita mediante XRD. Sin embargo, con AF como aditivo se observaron cristales con morfologías irregulares y se determinaron los polimorfos aragonita, calcita y vaterita mediante XRD. Por último, cuando AF se utilizó en presencia de otros aditivos o sustratos se obtuvieron cristales con morfología espiculadas, esféricas, romboédricas, etc. La determinación morfológica de los cristales de CaCO3 in vitro obtenidos mediante el proceso de difusión de gases fueron observados claramente mediante SEM y la determinación cristalina de sus polimorfos mediante XRD confirmando la importancia del efecto nucleador de los diferentes polímeros en combinación con sustratos de origen biológico, creemos, sin embargo, que el uso de nuevas técnicas de caracterización como AFM, XPS y microscopía electrónica de transmisión (TEM) potenciarían enormemente la presente memoria de título contribuyendo a un mejor entendimiento de los procesos moleculares involucrados en los ensayos de cristalización biológica de minerales inorgánicos como el CaCO3. Finalmente concluimos que es importante seguir ahondando en el conocimiento de la formación cristalina de materiales inorgánicos con el objeto de desarrollar nuevos materiales útiles para el ser humano y la creación de nuevas tecnologías de materiales, los cuales podrían llevar al hombre a nuevas fronteras aún no conocidas.
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Baker, Natalie. "Levels and Patterns of Genetic Diversity in Wild Populations and Cultured Stocks of Cherax Quadricarinatus (von Martens, 1868) (Decapoda: Parastacidae)." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16255/1/Natalie_Baker_Thesis.pdf.
Full textAbstract:
Studying species at the molecular level can provide insights into how ecological and biological processes interrelate resulting in the diversity we see today. This information can be applied to conserve species at risk of extinction, or to better manage genetic diversity in species of economic importance. Species that inhabit freshwater riverine systems commonly exhibit population structures that are related to their relative dispersal capability, contemporary stream structure and/or historical stream structure. This thesis examined the populations genetic structure of wild and cultured stocks of the commercially farmed freshwater crayfish, C. quadricarinatus (von Martens), using genetic markers characterized by different modes of inheritance. C. quadricarinatus is distributed naturally in riverine systems in northern Australia, and southern Paupa New Guinea (PNG) and inhabits a variety of freshwater ecosystems ranging from ephemeral to permanent. Life history characteristics of C. quadricarinatus suggest a high level of genetic structuring among wild stocks might exist. However, seasonal flooding coupled with low topography across its distribution in northern Australia may promote sufficient gene flow among rivers to produce genetic homogeneity. Historical gene flow may also influence modern genetic structure as many distinct riverine catchments that C. quadricarinatus inhabits, were once connected at times of lower sea level. Insight into genetic relationships among C. quadricarinatus populations will allow for better management practices of wild populations in the future.
The study investigated phylogenetic relationships among C. quadricarinatus representing 17 discrete natural drainages across the natural range in Australia and PNG, using 16s and COI gene sequences. Sequence analysis of both genes resolved two distinct genealogical lineages in Australia and three in PNG. The two divergent Australian lineages concur with original taxonomic descriptions of Reik (1969) based on external morphological differences. The three C. quadricarinatus populations sampled in PNG were all genetically distinct from each other, with one exhibiting a close association with an Australia lineage. The immense physical barriers (rugged mountain ranges) to gene flow in PNG will almost certainly have reduced dispersal capabilities for C. quadricarinatus. During times of lowered sea levels in the past, Australia and southern PNG were a single landmass with terrestrial and freshwater organisms theoretically able to disperse over associated land and via freshwater connections. The close genetic relationship between PNG and Australian C. quadricarinatus support a recent freshwater connection and hence gene flow between northern Australia and PNG C. quadricarinatus populations.
Genetic differentiation among some C. quadricarinatus lineages exhibit as much genetic divergence at 16s RNA sequences as taxonomically recognised sub-species in the Cherax genus. Since C. quadricarinatus was originally described as different species based on external morphological differences (Reik, 1969), it is recommended that the taxonomy of C. quadricarinatus in Australia and PNG be re-evaluated.
C. quadricarinatus specific microsatellite markers were developed for this study. Five variable loci were employed to investigate the extent of contemporary gene flow among fourteen C. quadricarinatus wild river populations in northern Australia. High FST and genetic distance estimates observed among pair wise comparisons of C. quadricarinatus populations are consistent with limited or no gene flow occurring among drainages. Speculation that C. quadricarinatus may disperse between adjacent or nearby drainages at times of flood, either across floodplains, or via flood plumes therefore seems highly unlikely among the populations examined in the current study. No significant correlation was observed between geographic distance and genetic distance among C. quadricarinatus populations here. C. quadricarinatus populations most closely resemble an island-like model, where gene flow is independent of geographic distance among populations and where genetic divergence occurs to a greater or lesser extent as a result of genetic drift within otherwise isolated populations.
A significant number of C. quadricarinatus populations showed deviations from expected Hardy-Weinberg equilibrium (HWE). Samples sizes may not have been sufficiently large to reflect a true representation of genotypic proportions present in the sampled populations due to the highly variable nature of microsatellite loci. Deviations from HWE equilibrium, however, can also result from null alleles. Null allele estimates suggested a large proportion of null alleles were present in the C. quadricarinatus populations analysed. This may be a result of C. quadricarinatus populations confined to discrete drainages experiencing independent evolution, resulting in mutations in primer binding sites.
The growing economic potential of C. quadricarinatus culture, both domestically and internationally, prompted expanding the current study to examine genetic diversity levels in commercial C. quadricarinatus stocks. The study employed five microsatellite markers to quantify genetic diversity in four Australian and three C. quadricarinatus culture stocks from overseas. Many C. quadricarinatus culture stocks also showed deviations from HWE expectations. This was not a surprising result given that the wild populations also deviated and domestication can also influence HWE. Relatively high levels of genetic diversity were observed. This probably results from intentional mixing of discrete river strains for production of the first commercial stock. Genetic differentiation estimates among culture stocks and assignment tests indicated that overseas culture stocks are most likely derived from the first commercial culture stock developed in Australia and then disseminated widely (the Hutchings stock). Robin Hutchings was a known supplier of live C. quadricarinatus to many international culture initiatives. Assignment of culture stocks back to their wild origins indicated that all C. quadricarinatus culture stocks sampled possess alleles that originate from the Flinders River (proportions ranged from 33-94%).
Domestication of C. quadricarinatus to date has not resulted in significant reductions in levels of genetic diversity (heterozygosity or alleles richness) when compared to wild populations sampled in this study. Comparing culture stocks to wild populations to gauge their 'genetic health' may not be a suitable scale for evaluating genetic diversity in culture stocks. Wild populations are essentially evolving independently, are subjected to harsh seasonal environmental fluctuations resulting in periodic population crashes (genetic bottlenecks), with little or no recruitment from neighbouring drainages (gene flow). This study does however indicate that there is a large amount of genetic diversity distributed among wild populations that has yet to be exploited in culture. Genetic diversity in wild populations provides a resource for future stock improvement programs for C. quadricarinatus culture and thus requires careful conservation and appropriate management.
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Baker, Natalie. "Levels and Patterns of Genetic Diversity in Wild Populations and Cultured Stocks of Cherax Quadricarinatus (von Martens, 1868) (Decapoda: Parastacidae)." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16255/.
Full textAbstract:
Studying species at the molecular level can provide insights into how ecological and biological processes interrelate resulting in the diversity we see today. This information can be applied to conserve species at risk of extinction, or to better manage genetic diversity in species of economic importance. Species that inhabit freshwater riverine systems commonly exhibit population structures that are related to their relative dispersal capability, contemporary stream structure and/or historical stream structure. This thesis examined the populations genetic structure of wild and cultured stocks of the commercially farmed freshwater crayfish, C. quadricarinatus (von Martens), using genetic markers characterized by different modes of inheritance. C. quadricarinatus is distributed naturally in riverine systems in northern Australia, and southern Paupa New Guinea (PNG) and inhabits a variety of freshwater ecosystems ranging from ephemeral to permanent. Life history characteristics of C. quadricarinatus suggest a high level of genetic structuring among wild stocks might exist. However, seasonal flooding coupled with low topography across its distribution in northern Australia may promote sufficient gene flow among rivers to produce genetic homogeneity. Historical gene flow may also influence modern genetic structure as many distinct riverine catchments that C. quadricarinatus inhabits, were once connected at times of lower sea level. Insight into genetic relationships among C. quadricarinatus populations will allow for better management practices of wild populations in the future. The study investigated phylogenetic relationships among C. quadricarinatus representing 17 discrete natural drainages across the natural range in Australia and PNG, using 16s and COI gene sequences. Sequence analysis of both genes resolved two distinct genealogical lineages in Australia and three in PNG. The two divergent Australian lineages concur with original taxonomic descriptions of Reik (1969) based on external morphological differences. The three C. quadricarinatus populations sampled in PNG were all genetically distinct from each other, with one exhibiting a close association with an Australia lineage. The immense physical barriers (rugged mountain ranges) to gene flow in PNG will almost certainly have reduced dispersal capabilities for C. quadricarinatus. During times of lowered sea levels in the past, Australia and southern PNG were a single landmass with terrestrial and freshwater organisms theoretically able to disperse over associated land and via freshwater connections. The close genetic relationship between PNG and Australian C. quadricarinatus support a recent freshwater connection and hence gene flow between northern Australia and PNG C. quadricarinatus populations. Genetic differentiation among some C. quadricarinatus lineages exhibit as much genetic divergence at 16s RNA sequences as taxonomically recognised sub-species in the Cherax genus. Since C. quadricarinatus was originally described as different species based on external morphological differences (Reik, 1969), it is recommended that the taxonomy of C. quadricarinatus in Australia and PNG be re-evaluated. C. quadricarinatus specific microsatellite markers were developed for this study. Five variable loci were employed to investigate the extent of contemporary gene flow among fourteen C. quadricarinatus wild river populations in northern Australia. High FST and genetic distance estimates observed among pair wise comparisons of C. quadricarinatus populations are consistent with limited or no gene flow occurring among drainages. Speculation that C. quadricarinatus may disperse between adjacent or nearby drainages at times of flood, either across floodplains, or via flood plumes therefore seems highly unlikely among the populations examined in the current study. No significant correlation was observed between geographic distance and genetic distance among C. quadricarinatus populations here. C. quadricarinatus populations most closely resemble an island-like model, where gene flow is independent of geographic distance among populations and where genetic divergence occurs to a greater or lesser extent as a result of genetic drift within otherwise isolated populations. A significant number of C. quadricarinatus populations showed deviations from expected Hardy-Weinberg equilibrium (HWE). Samples sizes may not have been sufficiently large to reflect a true representation of genotypic proportions present in the sampled populations due to the highly variable nature of microsatellite loci. Deviations from HWE equilibrium, however, can also result from null alleles. Null allele estimates suggested a large proportion of null alleles were present in the C. quadricarinatus populations analysed. This may be a result of C. quadricarinatus populations confined to discrete drainages experiencing independent evolution, resulting in mutations in primer binding sites. The growing economic potential of C. quadricarinatus culture, both domestically and internationally, prompted expanding the current study to examine genetic diversity levels in commercial C. quadricarinatus stocks. The study employed five microsatellite markers to quantify genetic diversity in four Australian and three C. quadricarinatus culture stocks from overseas. Many C. quadricarinatus culture stocks also showed deviations from HWE expectations. This was not a surprising result given that the wild populations also deviated and domestication can also influence HWE. Relatively high levels of genetic diversity were observed. This probably results from intentional mixing of discrete river strains for production of the first commercial stock. Genetic differentiation estimates among culture stocks and assignment tests indicated that overseas culture stocks are most likely derived from the first commercial culture stock developed in Australia and then disseminated widely (the Hutchings stock). Robin Hutchings was a known supplier of live C. quadricarinatus to many international culture initiatives. Assignment of culture stocks back to their wild origins indicated that all C. quadricarinatus culture stocks sampled possess alleles that originate from the Flinders River (proportions ranged from 33-94%). Domestication of C. quadricarinatus to date has not resulted in significant reductions in levels of genetic diversity (heterozygosity or alleles richness) when compared to wild populations sampled in this study. Comparing culture stocks to wild populations to gauge their 'genetic health' may not be a suitable scale for evaluating genetic diversity in culture stocks. Wild populations are essentially evolving independently, are subjected to harsh seasonal environmental fluctuations resulting in periodic population crashes (genetic bottlenecks), with little or no recruitment from neighbouring drainages (gene flow). This study does however indicate that there is a large amount of genetic diversity distributed among wild populations that has yet to be exploited in culture. Genetic diversity in wild populations provides a resource for future stock improvement programs for C. quadricarinatus culture and thus requires careful conservation and appropriate management.
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Roe, Brett, and b. roe@cqu edu au. "Ecologically Engineered Primary Production in Central Queensland, Australia - Integrated Fish and Crayfish Culture, Constructed Wetlands, Floral Hydroponics, and Industrial Wastewater." Central Queensland University. Sciences, 2005. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20080717.092551.
Full textAbstract:
The issue of sustainability has greatest significance in the midst of unilateral bio-socioeconomic degradation resulting from intense and increasing societal pressures placed on the unified global ecology. In such an environment, sustainable development seeks to manage natural resources within a free market economy, aiming to meet the needs of today's population, and to protect and enhance current resource quality and abundance. In this light, techniques of integrated sustainable primary production and wastewater management are the subject matters of this applied research. There are many researchable issues which could be addressed within the subject matter. The first focus in the research scope was driven by the most severe sustainability issue facing Central Queensland (Australia) in 2000: the depletion and degradation of freshwater supplies. Central Queensland (CQ) is an arid sub-tropical region that has suffered from a marked reduction in rainfall and increase in temperature over the last 100 years, {Miles, 2004 #172}, and by the year 2000, conditions had been exacerbated by eight years of severe drought and warmer than average temperatures and resulted in widespread animal and crop failures due to freshwater shortages. Such a problem required a multi-faceted ecological, social, and economic approach. Hence, research centred on investigating the science of integrating regional water-related industries and agribusiness, and biodiverse ecosystems to achieve water and wastewater reuse applications, and associated eco-socioeconomic benefits. Specifically, this research investigates the integration of (a) electrical power station wastewater (b) barramundi culture, (c) red claw culture, (d) constructed wetlands (for water quality management and habitat creation), and (e) hydroponic flower culture. This research produced outcomes of integrated water and wastewater reuse and recycling, marketable agriproducts production (fish, crayfish, and flowers), water and wastewater reuse and conservation, wetland primary production, carbon dioxide sequestration, aquatic pollution control, and biodiversity creation and support. Successful design and management, experimental trialing and evaluation of system components and subjects, and the development of a knowledge base including static and dynamic system models, represent advances in respective research areas, and underpin the emerging discipline of integrated systems approaches to eco-socioeconomic development. Additionally, several gaps in the current body of knowledge regarding integrated systems were filled, and interactive management tools were developed. Apart from this study, the integration of technologies (as described above) has not, to this author's knowledge, been accomplished.
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Chang, Li-Tzu, and 張立慈. "Biological Characteristics of Infestation by Craspedella pedum in Cherax quadricarinatus." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/77761264993951374391.
Full textAbstract:
碩士國立中興大學
獸醫學系暨研究所
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Cherax quadricarinatus is a common foreign species in Taiwan. It carries with parasite. What the species it is? I use optical microscopy, dissecting microscopy, scanning electron microscopy, and differential interference contrast microscopy to assist the identification of the parasite. In addition, use histopathology to find out whether the parasite causes red claw crayfish lesions? The result shows the species is Craspedella pedum which doesn’t cause lesions in Cherax quadricarinatus. And whether it infects Taiwan''s common crustaceans: Macrobrachium rosenbergii and Procambarus clarkia? The result shows it doesn’t infect mature Macrobrachium rosenbergii and Procambarus clarkia, but the influence on the young is still unknown. Is it possible to observe the hatching process of the worm eggs inside the carapace of the red claw crayfish to have a more complete understanding of the parasite life history? Due to rapidly deteriorated water quality, I didn’t get more information.
Books on the topic "Cherax quadricarinatus"
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The biology and acquaculture potential of the tropical freshwater crayfish Cherax quadricarinatus. Brisbane: Queensland Dept. of Primary Industries, 1990.
Find full textBook chapters on the topic "Cherax quadricarinatus"
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Cannon, Lester R. G. "Temnocephalan symbionts of the freshwater crayfish Cherax quadricarinatus from northern Australia." In Turbellarian Biology, 341–47. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-2775-2_47.
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Coughran, Jason, and Shawn Leckie. "Invasion of a New South Wales stream by the Tropical Crayfish, Cherax quadricarinatus (von Martens)." In Pest or Guest, 40–46. P.O. Box 20, Mosman NSW 2088, Australia: Royal Zoological Society of New South Wales, 2007. http://dx.doi.org/10.7882/fs.2007.007.
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Sewell, Kim B., and Lester R. G. Cannon. "A scanning electron microscope study of Craspedella sp. from the branchial chamber of redclaw crayfish, Cherax quadricarinatus, from Queensland, Australia." In Biology of Turbellaria and some Related Flatworms, 151–58. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0045-8_25.
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McClain, W. Ray. "Crayfish Aquaculture." In Fisheries and Aquaculture, 260–84. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190865627.003.0011.
Full textAbstract:
Crayfish have been in demand as desirable food items around the globe for centuries, and entrepreneurs have capitalized on this demand by developing and applying aquaculture principals for the intentional culture of this freshwater crustacean. The current state of the art has advanced within the last half century and is centered on a handful of species, represented by three different families, with some level of commercial production occurring on all continents except Antarctica. Procambarus clarkii (family Cambaridae), a native of south central USA, is cultured in the USA and China and easily forms the bulk of farm-raised and wild-captured crayfish globally. One North American species (Pacifastacus leniusculus) and two European species (Astacus astacus and A. leptodactylus) constitute the main cultured species from the family Astacidae and are grown in small operations throughout Europe and parts of Asia. Four species (Parastacidae), all natives of Oceania, are cultured in their native ranges and were also introduced for aquaculture in several locations around the globe. Cherax destructor and C. albidus, both commonly referred to as yabby, are medium-size crayfish and share similar life histories, whereas C. quadricarinatus (redclaw crayfish) and C. cainii (smooth marron) are larger and more valuable but have very different geographical origins. While commercial crayfish aquaculture is typically based on an extensive or semi-extensive production approach in earthen ponds, more intensive approaches may involve selective breeding, improved strains, brood or nursery phases, and use of raceways or recirculation systems. Pond size can range from 0.05 to 80 ha, depending on the species cultured. Harvesting is accomplished mainly by baited trap, although other gear and techniques are sometimes employed. Global crayfish aquaculture production has expanded significantly in the last decade, due largely to the integration of Procambarus clarkii with that of rice production in the USA and China. This integrated system of production works well because rice farming has similar requirements as crayfish aquaculture, such as clay soils, irrigation systems, and suitable climates; furthermore, the rice crop residue provides the base of the food web for furnishing sustenance to growing crayfish.
Conference papers on the topic "Cherax quadricarinatus"
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"Analysis on Breeding Techniques of Cherax Quadricarinatus." In 2018 International Conference on Biomedical Engineering, Machinery and Earth Science. Francis Academic Press, 2018. http://dx.doi.org/10.25236/bemes.2018.020.
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I.V., Tkacheva, Rumyantseva E.V., and Oganisyan M.M. "TECHNOLOGIE FOR GROWING AUSTRALIAN RED-CLAWED CRAYFISH (CHERAX QUADRICARINATUS)." In II INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE "DEVELOPMENT AND MODERN PROBLEMS OF AQUACULTURE" ("AQUACULTURE 2022" CONFERENCE). DSTU-Print, 2022. http://dx.doi.org/10.23947/aquaculture.2022.151-153.
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This article discusses the cultivation of Australian red-clawed crayfish, namely a costeffective and practical cultivation technology, its adaptability to this method of cultivation, as well as a brief description of the object.
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Lubis, Khairiza, Mufti Sudibyo, Puji Prastowo, and Nurliani Laili. "Morphometric differences between male and female of Cherax quadricarinatus from Sukkean Village, Toba Lake, Indonesia." In THE 8TH ANNUAL INTERNATIONAL SEMINAR ON TRENDS IN SCIENCE AND SCIENCE EDUCATION (AISTSSE) 2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0119349.
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Susanto, Gregorius Nugroho, Supono, and Fadhli Dzil Ikrom. "Sex reversal of juvenile freshwater crayfish (Cherax quadricarinatus) influenced by steroid extract of sea cucumber and 17α-methyltestosterone hormone at different temperatures." In INVENTING PROSPEROUS FUTURE THROUGH BIOLOGICAL RESEARCH AND TROPICAL BIODIVERSITY MANAGEMENT: Proceedings of the 5th International Conference on Biological Science. Author(s), 2018. http://dx.doi.org/10.1063/1.5050123.
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