WHO WE ARE – Cramer Fish Sciences

How to Farm Giant River Prawn | The Fish Site

Early Years of Fishing in Canada

Weir/Dam Counts: Adult salmon and steelhead can most easily be counted at weirs which completely span streams. The migration of adults is blocked and fish are allowed passage through some point or are trapped and passed upstream. The latter allows for collection of scales to determine age or the marking of fish for sampling and population estimation upstream through subsequent creel census or carcass counts. Operation of weirs is very labor intensive and costly and weir counts that yield adult population trends are available for very few rivers or time periods in northwestern California. Weirs are sometimes set up at hatcheries, such as the Noyo River Egg Taking Station, to capture spawners and may also provide adult salmon and steelhead counts. Weirs are also subject to damage during high flows so that even when money is allocated for weir operation, stream conditions can prove confounding. Fish ladders associated with dams, such as Van Arsdale Dam on the Eel River, have, nonetheless, provided long term counts of adult salmon and steelhead.

CRITFIC is touting new research that shows hatcheries have been an effective tool to rebuild spring king abundance in the Yakima without impacting wild fish

FAO Fisheries & Aquaculture Dicentrarchus labrax

When said person can show, to the satisfaction of the Fish and Wildlife Conservation Commission, that such taking or killing of deer is justified because of damage to the person’s crops caused by deer, the Fish and Wildlife Conservation Commission may issue a limited permit to the applicant to take or kill deer without being in violation of subsection (1) or subsection (3).

This guide from the FAO Cultured Aquatic Species Information Programme

Course Objective : To provide the opportunity for students to become knowledgeable about technical procedures and information sources on design, construction and use of sport and food fish hatcheries and culture facilities. The course will be taught by a team of faculty, staff and practicing professionals with special experiences and skills in the topics assigned to them. Laboratory sessions will focus on demonstrations, observations and information rather than skill building. Field trips will be taken to see various facilities.

FAO Fisheries & Aquaculture Clarias gariepinus


The objective of the overall project is to improve the conditions for a sustainable, comprehensive and ecological aquaculture and fisheries development. The main activities are focused on Carps aquaculture strengthening on hatcheries methods, sectors development, good practices of aquaculture and veterinary and sanitary services.

which is a part of the 15 National Fish Hatcheries ..

Book examines the economic analysis of fish hatchery operations in Ogun State, Nigeria. One hundred and twenty practitioners were selected using multi-stage sampling techniques and structured interview guides to elicit information. Data were analyzed using descriptive and inferential statistics. Result revealed that most of the respondents were males, married, educated, bred Clarias spp and used deep well water. Generated the mean income of N1,088,933.3, N1,072,133.3, N1,122,166.7 and N976,151.3 in Abeokuta, Ijebu-Ode, Ikenne and Ilaro zones respectively. Major constraints hindering business were poor marketing, poor genetic brood stocks, high inflation rate in the economy, poor infrastructural facilities and lack of finance. ANOVA revealed that there were significant differences among socio-economic characteristics of fish breeders in the four zones. There were significant differences between the cost elements in fish breeding activities and the total income. There was significant difference between the constraints associated with fish hatchery operations and the income. Government to find a lasting solution to the persistent inflation rate and establish brood stock banks.

Methods Used to Study Salmon and Steelhead Populations

Despite “limited entry,” the Pacific fleet rose rapidly in fishing power.A major Salmonid Enhancement Program commencing in the 1970s brought in new hatcheries and other techniques to increase abundance.

Weirs are sometimes set up at hatcheries, ..

Increased mortality of rainbow trout () was observed at a fish hatchery in Arkansas, USA, during 1966. A positive correlation was found between mortality and manganese concentrations () in the 1980s. Canonical distribution analysis showed that pH (4.5–5.4) and the concentration of labile inorganic manganese (0.1–0.4 mg/litre) explained all the observed mortality. The rate of accumulation on/in trout gills was correlated with the concentration of labile inorganic manganese (Nyberg et al., 1995).