Seed production of rabbitfish Siganus guttatus (original) (raw)
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Journal of Aquaculture & Livestock Production
A study aimed at the rabbitfish Siganus guttatus (Bloch, 1787), the reproductive ability of one economically important marine and brackish fish in Giang lagoon systems and marine Asia. The future expectations of mariculture development were decided in Vietnam. The region had enough fingerlings for intensive culture and polyculture to contribute to environmental conservation and sustainability. There were 3 experiments in 3 different ecosystems for fish culture and maturity by feeding a commercial feed and finding suitable areas for the maturing period. The results showed that the growing fish kept in cages on the lagoon had the best growth and rate maturity, much higher than fish in cages of shrimp ponds and plastic bottom ponds, as showed a much bigger size of body, 610 g/head for females and 542 g/head for males, while other culture more 500/head, especially after 3 months of feeding, more than 20% matured for females, they reached more 50% at 6 months feeding. The length at first...
HANDBOOK ON FISH PRODUCTION, 2020
Aquaculture is the production of aquatic organisms i.e. fish, crustaceans, mollusc, aquatic plants, algae, etc. It is currently the fastest growing livestock industry in the world (FAO, 2009; Ozigboet al., 2014). Fish production could be carried out in a controlled environment like concrete or earthen ponds, vats made of wooden or fibre glass and plastics tanks or bowls. In many countries including Nigeria, aquaculture is currently limited to fish production because farmers have limited knowledge of other aquatic organisms and low production capacity. Nigeria is blessed with thirty-three billion cubic meters of water. The country’s fish demand is close to 1,000,000 tons. Aquaculture production is about 200,000 tons and domestic catch from rivers and lakes is about 450,000 tons. The gap in the demand and supply is being met through importation. Due to insufficiency of domestic production, importation of fish and fish products accounts for more than half of fish supply in the country. Fish farming, according to Olaoyeet. al., (2012) implies some sort of intervention in the rearing process to enhance production, such as regular stocking, feeding, protection from predators, etc. Aquaculture has the potential to become a sustainable practice that can supplement capture fisheries, eliminate fish importation and significantly contribute to feeding the world’s growing population. Fish production is a good source of employment, food security, income generation, from local and foreign exchange, ecotourism and improve health. Some of the major challenges hindering fish production are lack of technical knowhow on appropriate methods of fingerlings production, method of production of cheap local fish feed using available feed stuff and lack of simple reference materials that can serve as a guide since extension agents are not available. Fish production should not fail because there is huge market for fish. However, poor location of farm, inappropriate fish pond design and construction, poor technical knowhow and facilities, insecurity, poor supervision and inadequate fund to run farms are the reasons why many fish farms have failed. This handbook was written to provide basic information in these areas so that fish production could be a mean of livelihood and sustenance. The hand book is divided into ninesections to cover the core areas of fish production. The sections are biology of fish, artificial propagation of fish/induced breeding, pond construction and management, integrated fish farming, Ornamental fisheries, fish nutrition, fish genetics and fish diseases and health management. Basic technical words are explained in the glossary to help the understanding of trainees.
Broodstock management and seed production of milkfish
1988
Milkfish (Chanos chanos Forsskal) remains one of the cheapest sources of protein for developing countries in Southeast Asia, particularly in the Philippines. The unpredictable supply of wild fry, the only source of seed for the milkfish farmer, contributed largely to the slow growth of the milkfish industry. Research on the artificial propagation of this fish was, therefore, given emphasis. Major research achievements in milkfish breeding of the SEAFDEC Aquaculture Department in the last decade include: (1) successful induced spawning of wild and captive breeders using gonadotropin preparations and gonadotropin-releasing hormone analogues (GnRHa); (2) spontaneous maturation and spawning of captive breeders; (3) completion of the life cycle of milkfish in captivity; (4) development of a simple egg-collecting method; and (5) development of techniques for mass production of milkfish fry. Information on fry ecology and behavior, larval morphology and physiology were also gathered. These published data constitute the bulk of current knowledge on milkfish biology and natural history. Milkfish breeding technology is currently being pilot-tested in several breeding sites of the Bureau of Fisheries and Aquatic Resources (BFAR). Spontaneous maturation and spawning of milkfish have been verified in four sites which differ in environmental characteristics. The economic feasibility of producing milkfish fry and the socioeconomic impact of artificial propagation of milkfish are now being assessed.
Marine fish hatchery: developments and future trends
2015
The basic procedures for producing marine fish fry in hatcheries developed for milkfish fry production nearly 3 decades ago are the basis of fry production systems for all other marine fish species that are now reared in hatcheries in the Philippines and other Southeast Asian countries. These include large-scale microalgae production in outdoor tanks, feeding of appropriate sized rotifer grown on microalgae such as Nannochlorum during the first feeding phase, and shifting to larger prey such as Artemia towards the latter stages of production. In recent years, the increasing demand for high-value species such as groupers, sea bass, red snapper, and pompano in both local and export markets has encouraged a number of hatcheries to produce fry to supply the requirements of fish cage farmers. Techniques are modified using information from research institutions and multi-national firms active in developing products and equipment to improve commercial production of these species. Larval fe...
Asian Aquaculture Volume 04(6) September 1981
1981
The giant tiger prawn (Penaeus monodon Fabricius), locally known as sugpo, has long been recognized as the most commercially important crustacean in the Philippines and many countries in Asia. Even at the high price of P75 to P95 a kilo in Metro Manila, the demand for sugpo continues to increase, locally and internationally, but production has never come near to satisfying the markets, especially Japan, the biggest importer of sugpo. The low supply of sugpo is attributed to the fact that sugpo is hardly caught in large numbers at one time in open waters, says Dr. Hiroshi Motoh, a Japanese prawn expert wh o worked with the SEAFDEC Aquaculture Department for 7 years. Because of the severe conditions in the open sea, fisheries experts estimate that the survival rate f r o m egg to fry of sugpo is only a fraction of 1 %. Pond culture of sugpo is constrained by the unreliable and inadequate supply of fry. The solution to this problem is to produce fry in hatcheries. Recent Advances Research efforts at the SEAFDEC Aquaculture Department in Tigbauan, Iloilo have yielded encouraging results which could greatly bolster the sugpo in-(Continued on page 2) Published quarterly by the Southeast Asian Fisheries Development Center, Aquaculture Department ASIAN AQUACULTURE Bare Improvements i n. . .
To evaluate growth performance of Milkfish
In the present study, wild caught early fingerlings Milkfish (Chanos chanosForsskål, 1755) (length & weight between of 3.8-6.4cm / 3-8g) average weight 5.35g werereared with different types of treatments for three months(15 th November-15 th February) and their performances in terms of growth and survival were determined. It is observed that upon the harvest the fish reached a weight between24-31g and a survival rate of 80.1±1%,thespecific growth rate was higher (82.8%) in fishes gatheredin the combination of soil & chicken manure (SC), followed bya combination of Urea & chicken manure (UC), and commercial pellets(CP) Control feeds. Survival rate was also higher in SC fishes, followed by UC and CP (control)feed. The size-frequency distribution shows that milkfish in the tank SC grew compared with tank CP specimens, their growth rate was lower. Tanks containing SC treatment had better specific growth rate than CP (control) treatment (p<0.05), although there was no significant differences between SC treatment and UC treatment in growth factors. Also, the number of surviving fish in UC treatment was simply higher than SC treatment and CP (control) (p<0.05).
This study determined the growth performance in terms of weight gain, length increment and survival of rabbitfish (S. canaliculatus) in fixed and floating net cages fed with commercial pellets. Net cages with a dimension of 2.5m x 2.5m x 3m were utilized and stocked with 50 pieces fingerlings/cage, replicated three times. Average body weight (ABW) and length increment (TBL) were recorded during sampling every fifteen days. The fish were fed three times daily at 5% of the body weight. Study showed that treatment I (fixed cage) obtained higher ABW and TBL of 60.5 g, 13.54 cm compared to treatment II (floating cage) with 52.67 g, 12.73 cm, respectively. Results showed no significant differences between treatments for sixty days. In terms of survival, data showed that Treatment I obtained 95.33% (SR) while treatment II had 80% but not differ significantly. It is recommended that further study in the same culture system with varying stocking densities and location be conducted to compare the results of this study.
Fish Farming Techniques: Current Situation and Trends
Journal of Marine Science and Engineering
World aquaculture is increasingly diversified and intensive, due to the use of new technologies, having grown a lot in recent decades and contributed significantly to improving food security and reducing poverty in the world, with fish farming being a promising activity for the production of protein with high nutritional value. The large aquaculture companies that recognize the potential of this important modality have invested in the study and production of various productive segments of the most diverse species of fish. This review article aims to provide information on the world panorama of marine fish farming, with the main systems and production stages of the most important organisms with commercial potential, aiming to achieve a highly sustainable production, with high nutritional content and benefits for human health. The production of live feed in the larval stage should be highlighted, in order to optimize survival and weight gain. In addition, trends in the cultivation of ...