Preliminary histological study of the ovarian development of the giant tiger prawn, Penaeus monodon

This study was undertaken to determine structural characteristics within the gonads which might serve as an index to age and longevity and furnish information on the frequency of spawning of an individual.

Effects of temperature on behavior, growth, development and survival of young milkfish, Chanos chanos Forsskal

The effects of 3 temperature treatments on activity, feeding, growth, development and survival of young milkfish (Chanos chanos) were investigated under laboratory conditions. It is believed that the results may be applied to develop a land-based mass production technology in rearing milkfish fry to fingerlings.

Larval and postlarval development of the window-pane shell, Placuna placenta L. (Bivalvia: Placunidae)

Stages of development of P. placenta from the straight-hinge veliger to the adult are described. Mature larvae metamorphose at lengths from 220-230 m. Larvae probably attach byssally to the water surface at metamorphosis and remain in the plankton for some time before finally settling on the mud bottom.

Captive breeding and embryonic development of honey gourami, Colisa sota (Ham.-Buch.)

Honey Gourami, Colisa sota, has high ornamental as well as food value. The natural resources of this species are gradually declining, due to destruction of its habitat, over fishing for aquarium trade and human consumption. The fish was bred in captivity under controlled environment. It laid about 200-400 eggs in bubble nest built by the male. Hatching started within 28-30hrs. after egg laying. The hatchlings became free swimming by 3rd to 4th day of hatching. The male showed territoriality and parental care by guarding the eggs and hatchlings. The larval survival was 30-35%. The breeding behavior, embryonic and post embryonic development of the fish were studied.

Mangroves to aquaculture

The paper discusses the recommended strategies regarding the further conversion of mangrove forests to fishponds and the management of existing fishponds for the culture of various aquatic species based on economic feasibility analysis. Strategy for the management of Philippine mangrove and the guidelines for the selection of mangrove areas for preservation, conservation and fishpond development are also presented.

Product development: market depends on good processing

The article presents the harvesting techniques, and handling and processing of cultured carps. Carps are harvested similarly with all other species in tropical countries while temperate countries, winter season is much considered. Water quality is an important factor to be considered because it can affect the hygienic and organoleptic quality of fish. Carps were commonly sold live, filleted, cut into sticks, frozen, used as breaded sticks, canned, bottled, and smoked.

Managing environmental impacts in aquaculture

The article presents the environmental impacts of aquaculture and the ways to manage them. The environmental impacts include issues of recreation and aesthetics, and the usage of resources and discharge of nutrients and organic matter into the environment. Likewise, the results are also discussed, such as reduced production, disease outbreak in cultured and wild populations, and an increase of regulatory restrictions being placed on aquaculture operations.

Go for environment friendly aquaculture

The article presents environment friendly aquaculture practices such as semi-intensive aquaculture, the culture of native species, the selection of proper sites for aquaculture facilities, the conduct of thorough, honest socioeconomic and ecological impact assessment before proceeding with the implementation, and the practice and promotion of proper pond/cage/tank preparation and management among others.

Recommendations on the effects of aquaculture on public health

The paper presents some recommendations on the effects of aquaculture on all persons affected by and involved in aquaculture, and to other users of waters in [which] aquatic organisms are farmed or which are affected by aquaculture: the farm workers, handlers and processors, sellers and consumers of aquaculture products.

Examining the possibilty of multiplication and breeding of (Schizothorav [sic] zarudnyi) in order to restoration of regional aquatics reservations of Hamoon Lake and taking its advantag [sic] for aquaculture

Schizothorax zarudnvi, is an endemic fish of east country waters. (Triple lagoons of Hamoon and relevant water resources) that in the world it is reported in this resource specially. This fish named Hamoon mahi is one of the most economically valuable species in this region. Because of the recent years droughts, Hamoon logoon has been drive since 2000. Also, semi-wells (a semi natural resource) were affected drastically by recent drought years and their volume reduced to nearly one third of their real volume and resulted in changing at growth and reproduction physiology process in Schizothorax zanidnyi, brood stocks. Beginning of this project was done from October 2003. It's field studies begun (brood catching) since November 2001 by two methods including entangling gairs and at semi wells of Sistan that (Beach seine) had maximum rate of preparing qualified brood stocks. Broods transferred to Cyprinidea reproduction work shop of Zahak and after taking primary measures they stored in to the edaphic pools. Increasing the success safety factor (coefficient) for artificial reproduction of Sthizothorax zarudnyi , identifying the appropriate tune for Hormonal acceptance (physiological preparation of broods) is needed , so this important work was done regularly by histological studies and GSI measurements since November. Highest GSI rates of females (%80.51) and highest IV stage abundance of sexual maturity (%l 00) were observed an march. On the base of this date, Hormone therapy was done on broods on march. The used hormones are as follows Hypophysis. extraction, GnRHa and Anti Dopamin at the dozes of 3-6 ml, 20-30kg and 10-15 ml per kg body weight respectively and 2-3 times from 11-12-80 they were injected. Injected broods kept in to two circumstances, flow-through (rounded pool) and stagnant systems. In stagnant system 14 and 19 individuals of female and male (Schizothorax zauiulnri) broods, respectively injected in 11th, 15111, 19th, and 24th of march 1380. Non of the injected broods in 11 and 15 and 19th march (in stagnant Condition) answered to Hormone therapy. After final injection broods had general less activity and a few of them died. Mean temperature of brood pond waters (daily) which were injected. Fluctuated between 10-25-13. 63°c but injected broods on 24th march had different characteristics. They had pale color and had few fecundity. In this stage of injection they hadn't any successful vulation. After injection, Mean daily water temperature was 15, 88-17, 54°c. In Flowing system, 13-16 individual of males and females respectively were injected on 15th, 19th, 22th and 23th march. None of injected producers on 15th and 19th march with mean daily water temperature of 10, 25-12°c were prepared for spawning but injected producers on 22nd an 23th march with mean daily water temperature of 13.5-1 rc responded about 75-100 percent. (Schizothorax zarudnyi) brood stocks were prepared for spawning after 353-428 hours/day from final injection. Diameter of obtained eggs (before fertilization) was between 1.9-2.3 min and of fertilized eggs was 3.8mm. Fertilized eggs of (Schizothorax zarudnyi) were hatched after 6-7 days with mean water temperature of 17.08°c. Mean length of on one day larvae was 9.47 mm. Larvae was 9.47 mm. Larvae adsorbed the whole yolk sac after , 5-6 days at 17- 1°c and were prepared for releasing in to edaphic pools. Because of the lack of necessary and complementary facilities in the region , they had to release them in to veniros and growing them for 8 days. At the end of 18th day , 35000 larvae (at first) released into an edaphic pond with a volume of 150m2. After growing them for one moth , mean length and weight of new hatched larvae was 29.41 mm and 1.12►r , respectively. With respect to results of this investigation , artificial reproduction of (Schizothorax zarudnyi) Can be possible at 14-17°C and flowing water with Hormonal treatment. It -s breeding has increased development than other cultural specious in the region. Due to high economical value of this specious in Sistan and ti-s specialization east waters of Iran and having high resistance and proper growth There is a need of it's development and reproduction and culture in fish culture fanns (edaphic ponds• two-purpose pools) at the region and country.

Guidelines for environmentally acceptable coastal aquaculture

The article discusses the guidelines for environmentally acceptable aquaculture to ensure that financial gain is not at the expense of the ecosystem or the rest of society. The general principles, strategies and objectives, and action plans for the implementation of environment-friendly aquaculture is also discussed.

Research and development at SEAFDEC/AQD

The article presents the R & D activities of Southeast Asian Development Center, Aquaculture Department (SEAFDEC/AQD) for 20 years. Its accomplishments in seafarming, community-based resource management, and sea ranching of snappers and mollucs are discussed.

A continuing PROCESS: for grassroots development

PROCESS (Participatory Research, Organization of Communities, and Education Towards Struggle for Self-reliance) is the offshoot of an experiment encouraged by the International Labor Organization to stimulate self-help initiatives among rural communities in Antique and Batangas. Its operations today extend to 10 provinces in the Philippines, touching the lives of thousands of farmers, fisherfolk, women and other marginalized sectors.