scholarly journals Optimizing fish structure in angling ponds focusing on white fish

2019 ◽  
pp. 33-36
Author(s):  
József Molnár ◽  
Balázs Csorbai ◽  
Gergely Bernáth ◽  
Levente Várkonyi ◽  
Béla Urbányi ◽  
...  
Keyword(s):  
Fish Species ◽  
Natural Waters ◽  
Stocking Density ◽  
Growth Potential ◽  
Fish Stock ◽  
Commercial Fishing ◽  
Larval Rearing ◽  
Cage System ◽  
Leuciscus Idus ◽  
Rearing Experiment

According to new amendments of laws, commercial fishing licenses of natural waters shall not be issued from the calendar year 2016 in Hungary. However, the most settlement of white fish to angler ponds originated from natural waters. Currently, there is no sufficient quantity of fish species belonging to this group available to fulfil the settlement commitments of fish farmers. The aim of this recent study is to develop a breeding and production technology that is suitable for settlement of large quantities of this fish species of appropriate length of (4–5 cm). The following methods are investigated: aquaculture cage system (pond-in-pond system), monoculture and mixed population with different ratio of white fish in fish structure. Due to the different environmental needs of different fish species, many parameters need to be investigated, for example: stocking density, feeding, oxygen level, monoculture or mixed populations, growth potential and mortality. A preliminary experiment was carried out following the artificial propagation of ide (Leuciscus idus) following a 21-day larval rearing experiment in which the effect of different stoking density was investigated for mortality and growth. On the basis of the expected results, the optimal conditions for the aquaculture cage system will be described, regarding to the white fish stock.

scholarly journals Characteristics of meat, pet, and research rabbit farms in Brazil: An overview based on twelve farms

2021 ◽  
Vol 29 (2) ◽  
pp. 115
Author(s):  
Kassy Gomes da Silva ◽  
Tâmara Duarte Borges ◽  
Leandro Batista Costa ◽  
Cristina Santos Sotomaior
Keyword(s):  
Average Rate ◽  
Animal Health ◽  
Stocking Density ◽  
Growth Potential ◽  
Cage System ◽  
Production Techniques ◽  
Basic Production ◽  
The Mean ◽  
Great Growth ◽  
Wire Cage

<p>Rabbit production has great growth potential in a country where animal production is very important. However, there is little data about this industry in Southern and Southeast Brazil. The aim of this study was to describe Brazilian rabbit farms that provide meat, pets and animals for learning or research. Three pet farms, four meat farms and five research rabbit farms were visited, and the production and farm characteristics data were collected between June 2018 and March 2019. A total of 1170 rabbits and 617 cages were evaluated. Most farms had 21 to 60 (58.3%) does. Considering all farms, the farmers reported an average rate of conception of 71.8%, prolificacy rate of 6.7 kits per parturition, average interval between parturitions of 65 d and 6.3 parturitions/doe yr. The mean mortality rate for breeding rabbits was 10.4%, compared to 1.7% for growing rabbits (rabbits post-weaning until slaughter or sale). The average area of a cage was 0.43±0.1 m², with an average stocking density for growing rabbits of 3 rabbits/m². The most common cage system used by farmers was a flat-deck (66.7% of farms) system with a wire cage (91.7%). Metal (41.7%) and clay (33.3%) feeders were the most common types of feeders, and automatic nipple drinkers were present in 75% of the farms. Dirt accumulation was observed in 11.2% of the cages and 5.7% of the drinkers, but not in feeders. A total of 4.1% of the cages were considered unsafe, and 0.8% had problems with the drinkers. The farms studied ranged from small to medium in size, used an extensive reproductive rhythm and followed basic production techniques. Animal health and management aspects need to be reviewed by the farmer if the rabbit production conditions are to improve.</p>

Inducing Gynogenetic Development of IDE (Leuciscus Idus L.) Using Semen of other Fish Species

2007 ◽  
Vol 22 (4) ◽  
pp. 714-721 ◽  
Author(s):  
Dariusz Kucharczyk ◽  
Andrzej Szczerbowski ◽  
Marek J. Łuczyński ◽  
Roman Kujawa ◽  
Andrzej Mamcarz ◽  
...  
Keyword(s):  
Fish Species ◽  
Leuciscus Idus

Heat balance, haematology and serum chemistry of layers under varying stocking density reared in locally fabricated metal-type cage system

2020 ◽  
Vol 40 (2) ◽  
pp. 92-103
Author(s):  
K. O. Bello ◽  
A. E. Adiatu ◽  
M. O. Osunlakin ◽  
O. O. Oni
Keyword(s):  
Relative Humidity ◽  
Ambient Temperature ◽  
Rectal Temperature ◽  
Heat Balance ◽  
Total Protein ◽  
Stocking Density ◽  
Fabricated Metal ◽  
Cage System ◽  
Chemical Measurements ◽  
Metal Type

One hundred and thirty five 18weeks old Bovans Nera Black strain pullets were used in a 10week study to determine their heat balance and blood profile under varying stocking density in locally fabricated metal-type cage system. The cages were stocked 2, 3 and 4birds/cell. Daily ambient temperature and relative humidity of the cage and rectal temperature of the birds were taken and heat balance calculated. Record of Packed cell volume (PCV), Haemoglobin concentration (Hb), Red blood cell (RBC), White blood count (WBC) and differential of the birds were taken at beginning and end of the study for the haematological indices while blood glucose, total protein, Albumin and blood urea were taken for the bio-chemical measurements. Ambient temperature, relative humidity, and heat balance showed no significant (P>0.05) difference with cage stocking density. Cage stocking density had significant (P<0.05) effect on rectal temperature of layers. Bird stocked 3/cell recorded the least (41.14oC) rectal temperature while those stocked 4/cell recorded the highest (41.27oC). All the haematological parameters of the birds were not significantly (P>0.05) influenced by stocking density of the cage type. Bio-chemical measurements were not significantly (P>0.05) different among layers under varying stocking density of the cage except total protein (P<0.05). Layers stocked 4/cell recorded highest (5.22g/dl) total protein while those stocked 3/cell had the least value (4.37g/dl). However, the values were within the normal range recommended for healthy chicken. The study concluded that locally fabricated metal-type battery cage could be used to rear layers and stocking density of 3birds/cell is ideal without compromising the welfare of the birds.

Necessary Components of Economic Surplus in Fisheries Economics

1980 ◽  
Vol 37 (5) ◽  
pp. 858-870 ◽  
Author(s):  
Lee G. Anderson
Keyword(s):  
Consumer Surplus ◽  
Fish Stock ◽  
Commercial Fishing ◽  
Fishing Industry ◽  
Fisheries Economics ◽  
Economic Surplus ◽  
Detailed Model ◽  
Maximum Economic Yield ◽  
Worker Satisfaction ◽  
Different Levels

There are four main types of economic surpluses that can be achieved when exploiting a fishery. They are rent to the productive nature of the fish stock, normal factor rents to inputs, consumer surplus, and what is called here, worker satisfaction bonus, WSB. The latter refers to nonmonetary benefits individuals can obtain from participating in commercial fishing and, to be complete, in other occupations as well. It is discussed frequently, but has never received any formal treatment in the literature. In this paper the logic behind WSB in the fishing industry is discussed and its implications on policy is shown. A detailed model is developed which can show how all of the components of economic surplus relate to one another and how they will vary at different levels of output.Key words: fisheries economics, economic surplus, worker satisfaction bonus, maximum economic yield

scholarly journals Intensification of “mola” (Amblypharyngodon mola) culture in homestead ponds

2020 ◽  
Vol 9 (2) ◽  
pp. 23-29
Author(s):  
SN Mona ◽  
S Sultana ◽  
KK Ahmed ◽  
N Khan ◽  
KA Huq ◽  
...  
Keyword(s):  
Water Quality ◽  
Fish Species ◽  
Stocking Density ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Culture Period ◽  
Total Biomass ◽  
Supplementary Feed ◽  
By Products ◽  
Indigenous Fish Species

The research was carried out with small indigenous fish species (SIS) named mola (Amblypharyngadan mola) in monoculture system to intensify production in farmers’ homestead ponds with 50% household women involvement during June to December, 2016. Brood mola was stocked at the rate of 2, 4 and 6 m-2 with three replications in each treatment. Supplementary feed (27.1% protein) consisted of commonly available agricultural by-products was provided daily at the rate of 2% of the total biomass along with natural feed as mola is planktivorous species. Seven different water quality parameters were measured fortnightly and found within cultivable range. Gross production of mola were obtained 520.59±23.4, 599.06±258.87, 1063.94±42.87 kg ha-1 from T1, T2 and T3, respectively after 4 months’ culture period. The yield of T3 was significantly greater (P < 0.05) than T1 and T2. The highest gross production was obtained in T3 where stocking density was 6 brood mola m-2. Int. J. Agril. Res. Innov. Tech. 9(2): 23-29, December 2019

scholarly journals Comparison of ovarian cycles of Hungarian riverine fish species representing different spawning strategies 441

2008 ◽  
Vol 53 (No. 10) ◽  
pp. 441-452 ◽  
Author(s):  
K.K. Lefler ◽  
Á. Hegyi ◽  
F. Baska ◽  
J. Gál ◽  
Á. Horváth ◽  
...  
Keyword(s):  
Fish Species ◽  
Ovarian Cycle ◽  
Spawning Period ◽  
Barbus Barbus ◽  
Chondrostoma Nasus ◽  
Leuciscus Idus ◽  
Riverine Fish ◽  
White Bream ◽  
Heterogeneous Size

Investigations on the ovarian cycle of fish species that inhabit Hungarian rivers are necessitated by both environmental and economic reasons. The objective of our research was to explore new fundamental knowledge concerning the ovarian cycle of the white bream (<I>Blicca bjoerkna</I>, Linnaeus, 1758), barbel (<I>Barbus barbus</I>, Linnaeus, 1758), orfe <I>(Leuciscus idus</I>, Linnaeus, 1758) and nase (<I>Chondrostoma nasus</I>, Linnaeus, 1758). Histological investigation of ovaries and determination of proportions of oocytes in different stages of development is an appropriate method for the description of spawning characteristics of these species. Our results show that the GSI value for all four investigated species starts to increase at the end of summer and reaches its maximum before spawning. In the barbel and white bream, the presence of oocytes in the stage of cortical alveoli and the heterogeneous size of oocytes in the stage of vitellogenesis in the pre-spawning period indicate that barbel and white bream are multiple spawners. In contrast, in the orfe and nase, the absence of oocytes in the stage of cortical alveoli and the homogeneous size of cells in the stage of vitellogenesis indicate that orfe and nase are single spawners.

The effect of stocking density, flock size and modified management on laying hen behaviour and welfare in a non-cage system

2006 ◽  
Vol 101 (1-2) ◽  
pp. 111-124 ◽  
Author(s):  
Patrick H. Zimmerman ◽  
A.Cecilia Lindberg ◽  
Stuart J. Pope ◽  
Elizabeth Glen ◽  
J. Elizabeth Bolhuis ◽  
...  
Keyword(s):  
Stocking Density ◽  
Laying Hen ◽  
Flock Size ◽  
Cage System

scholarly journals PENEBARAN IKAN BANDENG DI WADUK JATILUHUR: Analisis Dampak dan Kebijakan Pengembangan

2020 ◽  
Vol 1 (1) ◽  
pp. 1 ◽  
Author(s):  
Sonny Koeshendrajana ◽  
Tenny Apriliani ◽  
Maulana Firdaus ◽  
Zahri Nasution ◽  
Amula Nurfiarin
Keyword(s):  
Water Quality ◽  
Fish Species ◽  
Population Dynamic ◽  
Economic Conditions ◽  
Fish Stock ◽  
Management Options ◽  
Aquatic Resources ◽  
Improve Water Quality ◽  
The Impact ◽  
Research Show

Penebaran ikan bandeng merupakan salah satu opsi pengelolaan yang dilakukan untuk memperbaiki kualitas perairan yang semakin menurun di Waduk Jatiluhur. Penebaran ikan bandeng ke perairan waduk Jatiluhur secara sistematis telah dilakukan sejak tahun 2008, namun demikian, manfaat yang dapat dirasakan belum banyak mendapat perhatian. Penelitian bertujuan untuk mengevaluasi secara sosial ekonomi dampak penebaran ikan bandeng di perairan Waduk Jatiluhur sebagai basis pengembangan di masa mendatang telah dilakukan. Penelitian di lapang menunjukkan bahwa penebaran bandeng memberikan dampak bagi kualitas sumberdaya perairan serta kondisi sosial ekonomi masyarakat. Berdasarkan pertimbangan-pertimbangan tersebut maka beberapa rumusan kebijakan yang perlu ditindak lanjuti adalah: (i) mengkaji dampak penebaran ikan bandeng terhadap pertumbuhan ikan budidaya dalam karamba; (ii) melakukan ujicoba penebaran dengan jenis ikan lainnya yang mampu bereproduksi secara alamiah di perairan waduk dan tidak menganggu kestabilan dinamika populasi ikan; (iii) penguatan kelembagaan penebaran ikan, serta; (iv) melakukan sosialisasi lebih intensif mengenai perlunya kesadaran masyarakat untuk menjaga kelestarian sumber daya perairan.Title: Introducing Milkfish in the Jatiluhur Reservoir: Analysis of Impacts and Policies Development.Introducing milkfish is considered one of management options to improve water quality in the Jatiluhur reservoir. This activity has been systematically carried out since 2008; however, tangible benefits from this activity are less coverage. This research aimed to evaluate socio-economic impacts of milkfish stocking in the Jatiluhur reservoir that can be used as a basis for future fisheries development in this reservoir. Results of this research show that milkfish-stocking in the Jatiluhur reservoir contributed to the improvement of its aquatic resources environment and socio-economic conditions of the society. Based on these findings, several policies recommendation should be followed up and implemented, namely (i) immediately assess the impact of milkfish stocking to the growth of fish cultured in the cage; (ii) stocking different fish species that enable to reproduce naturally in the reservoir waters without disturbing population dynamic of fish stock; (iii) strengthening institution of the fish stocking program, and (iv) intensify dissemination and people awareness to conserve aquatic resources.

scholarly journals Rearing of Mud Crab, Scylla tranquebarica Larvae with Different Stocking Densities

Omni-Akuatika ◽  
2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Gunarto Gunarto ◽  
Sulaeman Sulaeman
Keyword(s):  
Stocking Density ◽  
Larval Rearing ◽  
Life Stages ◽  
Asian Countries ◽  
Mud Crab ◽  
Experimental Tank ◽  
Fibre Glass ◽  
Commercial Diet ◽  
Stage Development ◽  
Southeast Asian Countries

Mud crab (Scylla tranquebarica) is an important aquaculture species, especially in Southeast Asian Countries. However, the larval rearing of this species faces problems resulted in low survival caused not only by intensif canibalism but also by prolonged in larval rearing period. The stocking density during ealy life stages is proposed to influence  the crablet production in the larvae rearing tanks. The objective of this research was to evaluate the effect of stocking densities on larval stage development and crablet production of mud crab, S. tranquebarica. Four different initial stocking densities of larvae were tested using 200 L fibre glass tank, namely:  A). 30 ind,/L, B). 45 ind./L, C). 60 ind./L and D). 75 ind./L. Rotifer, Brachionus sp, and Artemia nauplii were  fed to the larvae with additional commercial diet. Water exchanged in the rearing tank was performed since 7 days post hatching (dph)  to 20 dph  at  a rate of 10 to 40%. Larvae from each experimental tank was sampled periodically (2 to 4 days interval) in order to calculate larvae population, larvae development index (LDI). Megalopa occurences index (MOI), and crablet production were also monitored. The result showed that the highest of LDI and MOI were obtained from  treatment B and D which were significantly different (P<0.05) to the other treatments. Furthermore, the highest of crablet production was obtained from treatment D = 495.3+22.48 ind./tank, which was significantly higher (P<0.05) compared to treatment A (48.5+4.94 ind./tank), treatment B (167.5+10.61 ind./tank) and treatment C (218.33+10.41 ind./tank). Therefore, the stocking density of 75 ind./L is optimum for mud crab S. tranquebarica larvae and recommended to be applied for commercial larvae production in hatchery. Keyword: Production, crablet, stocking density, larvae, Scylla tranquebarica

scholarly journals Eco-legal and economic aspects of developing Malomorsky fishing area of Lake Baikal

Fisheries ◽  
2021 ◽  
Vol 2021 (1) ◽  
pp. 20-26
Author(s):  
Alexander Sukhodolov ◽  
Andrei Fedotov ◽  
Mikhail Makarov ◽  
Pavel Anoshko ◽  
Alina Kolesnikova ◽  
...  
Keyword(s):  
Lake Baikal ◽  
Large Scale ◽  
Water Reservoir ◽  
Economic Assessment ◽  
Fish Stock ◽  
Commercial Fishing ◽  
Fishing Industry ◽  
World Heritage List ◽  
The 19Th Century ◽  
Fishing Area

Lake Baikal is the largest fresh water reservoir of our planet and a unique natural site included in the UNESCO World Heritage List. Meanwhile, Baikal is not only Russia’s largest freshwater fishing reservoir. Large-scale commercial fishing started here at the beginning of the 19th century and, with small breaks caused by bans imposed on industrial fishing due to depletion of valuable commercial fishery species stock, continued until October 2017, when once again restrictions in the fishing industry were imposed. One of the reasons for this was the increasing of the illegal unreported and unregulated fishing which led to depletion of harvestable stock of omul. However, these restrictions neither eliminated extensive unreported fishing, nor solved the problem of rapid fish stock rebuilding in the unique lake. Using methods of mathematical analysis and modeling this article examines factors facilitating breach of law in the fishing industry and unreported fishing for Baikal omul. The article provides a brief characteristic of the Baikal oldest Malomorsky fishing area as well as an eco-economic assessment of the possibility to rebuild the fishing stock within this water zone taking into account the increasing tourist flow in the Baikal region.

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