209,224 research outputs found
Collection, storage, transport, and acclimation of milkfish fry and fingerlings
No full textThe present methods of collecting fry and fingerlings involve filtration by mobile or stationary devices. The bottom topography of the fry ground, wind direction, and tidal fluctuations are the most important considerations in the design and construction of fry and fingerling catching gear. The behavior of young milkfish (Chanos chanos ) in the different environments where they are exploited determines the catching methods to be employed. Collection, handling, storage, and transport activities expose the fish to undue stress, which contributes to poor survival. The simple method of lowering the salinity of the water medium considerably reduces mortality. Prior acclimation history has significant effects on subsequent survival and adaptation. Although it appears that milkfish fry are more hardy than the fingerlings, both have the same capability for resisting subsequent environmental stress provided sufficient time is given for the fish to recover from previous stress
The ecological aspects of milkfish fry occurrence, particularly in the Philippines
No full textAspects of the time, place, and mechanism of occurrence of milkfish (Chanos chanos ) fry, defined as the postlarvae 10-17 mm in total length and 3 weeks of age are considered. Fry occurrence shows seasonal patterns that differ by latitude. In the Philippines (15-21 degree N), fry appear earlier in the south (December-January) and later in the north (March-April); they disappear earlier in the north (July-August) than in the south (December-January). Greater numbers of fry occur in shore waters during the full moon and new moon periods, largely as a consequence of the greater spawning activity during the quarter moon periods. Fry catch by various active and passive filtering gear is greater at floods and high tide than at low and ebb tide. Milkfish fry occur in and are collected mostly from sandy beaches, particularly the surf zone and in and around river mouths. They appear to be distributed mostly near the surface, with greater numbers nearer shore. It appears that larvae smaller than 9-10 mm are distributed in midwaters, but once they reach this size they come up and are carried inshore by tidal and wind-driven currents
The sense organs and behaviors of milkfish fry in relation to collection techniques
No full textThis paper describes the sense organs and some of the behavioral characteristics of milkfish (Chanos chanos ) fry, based on studies conducted at the Aquaculture Department, SEAFDEC, Philippines and at Kagoshima University, Japan in 1982. Based on the experimental results obtained and the observations made in the Philippines, Indonesia, and Taiwan, existing fry collection techniques such as the employment of fish lamps and scare lines are considered effective and rational. Several recommendations are made for improvements of the collection gear and for research on fry behavior
Mary Rowena Pender
No full textThis glass plate negative labeled M. R. Pender is part of the Frank Fry Collection and shows Mary Rowena Pender (1860-1927), mother of Mattie Fry. Frank Emmett Fry (December 13, 1877-February 12, 1939), originally from Ohio, settled in western North Carolina around 1895. He was superintendent of the North Carolina Talc and Mining Company, located in Hewitt, NC (Swain County), and was also involved in the lumber industry. He married Martha "Mattie" Emerelda Pender (February 24, 1879-October 31, 1958), and the couple had seven children. Fry’s photography appears to date from the first decade of the 1900’s, and features images of Hewitt, Bryson City, and the surrounding area
Fry Collection
No full textThese materials where found by Jesse Meyers in the Tomas Salazar house on Huisache Avenue in Kingsville, Texas. The collection is comprised of correspondence, photos, and newspaper clippings dating to the end of World War I. The bulk of the correspondence details the death of Cpl. Earl Fry who died in France at the end of 1918. The WWI photos are from England, France, Scotland, Germany, and Ireland. The rest of the photos cover the South Texas area, railroad, and family
Interactions of hormones and gonadal development of Tilapia aurea fry
No full textTypescript (photocopy).Gonadal differentiation of Tilapia aurea fry reared under various photoperiods was studied. Histological sections were made of fry gonads from the first free-swimming day through day 20 from samples taken every other day. Three feeding treatments were used for each photoperiod: no hormone, 17-[alpha]-ethynyltestosterone, and 17-[alpha]-ethynyl-estradiol. Statistical analyses show no significant difference in percent of differentiated and non-differentiated fry among the photoperiods. There also was no significant difference in size of fry for each feed treatment among the photoperiods. Fry treated with 17-[alpha]-ethynylestradiol initiated differentiation four days earlier than females not receiving hormone. Males fed 17-[alpha]-ethynyltestosterone initiated differentiation two days earlier than non-hormone treated fry. There was no significant difference in percent of differentiated to non-differentiated fry by age but there was a significant difference in size by age. Differentiated fry were significantly larger than non-differentiated fry. Fry treated with 17-[alpha]-ethynyltestosterone were significantly larger than male fry not receiving the hormone and females, which included both those fed 17-[alpha]-ethynylestradiol and those not given this hormone. Females fed 17-[alpha]-ethynylestradiol were not significantly different in size from females not receiving the hormone
Broodstock management and seed production of tilapia and carp
No full textBighead (Aristichthys nobilis) and silver (Hypophthalmichthys molitrix) carps were reared in ponds, pens and floating cages in Laguna Lake until maturity. Spontaneous gonadal maturation and rematuration of carp broodstock occurred within 2-2.5 years with average weight of 3-4 kg. Under lake conditions, broodstock were not given supplemental feeds. Induced spawning of gravid females was done by intraperitoneal injections using HCG combined with either common carp pituitary homogenates or LHRH-A. Stripping and dry-fertilization of eggs were done 6-8 hr after the final injection. Eggs were incubated in water containing 300-500 ppm Total Hardness. Fertilization and hatching rates were 23-88% and 7-36%, respectively. Post-larval carps were reared in tanks and fine-meshed nylon net cages installed in manured ponds. Tank-reared post-larvae were fed with Brachionus plicatilis and subsequently with Moina macrocopa in combination with powered formulated feeds containing 40% crude protein. Fry were harvested and stocked in nursery cages after 30-45 days of rearing in tanks.
Four-month old 50-100 g tilapia (Oreochromis niloticus) stocked in hapa net cages, tanks or ponds were used for breeding. Egg and fry production was significantly high at 4 females/m2 stocking density Different sex ratios, however, did not affect fry production. Spawning frequency and total growth of broodstock was highest in fry fed formulated diets containing 50% crude protein. Harvesting of fry was done every 15 days during summer months and every 21 days during cold months. Fry were reared in tanks and hapa cages and fed diets containing 35% crude protein. Supplemental feeding in the lake was suspended when productivity reached 3 gC/m2 /day
M. J. Fry, The afghan economy
No full textÉtienne Gilbert. M. J. Fry, The afghan economy. In: Tiers-Monde, tome 18, n°69, 1977. Migrations et développement, sous la direction de Bernard Kayser. p. 200
Milkfish research in the Philippines
No full textDevelopment and directions in milkfish (Chanos chanos ) research in the Philippines from 1976 to the present are reviewed and analyzed. The problems of milkfish culture are dichotomous: low productivity vis-a-vis seasons of glut and price fluctuations. To intensify fish production extensive research has been conducted on fertilizer management, reclamation of acid sulfate soils, and pond construction and engineering. Research efforts have also been heavily directed toward increasing fry production through artificial propagation, improvement of fry collecting gear, and increasing fry survival through nutrition, control of parasites, and proper handling. Research on improved icing, packaging, and processing techniques along with market analysis are necessary for maximizing economic returns
Milkfish aquaculture in Sri Lanka
No full textMilkfish (Chanos chanos ) fry and fingerlings are abundant in coastal and brackishwater areas in Sri Lanka, yet the industry remains in a stage of underdevelopment. The main seed collection centers are Mannar and Kalpitiya in the northwest and the season is from March to June. The annual fry production potential of the Mannar tidal flats is estimated to be about 4 million. The brackishwater aquaculture potential of Sri Lanka is estimated to be about 120,000 ha. In the past, returns from fry collected from tidal pools and stocked into perennial tanks have been very poor. The recently initiated seed resources survey and investigations into scientific collection, transport, and culture including pen culture should help develop farming of milkfish in Sri Lanka. Polyculture of the species with other fish and shrimp and its culture in salterns are being attempted
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