Aquaculture development in less developed countries: Social,economic and political problems: Leah J. Smith and Susan Peterson. Bowker Publishing Company,Essex, U.K., 1982. 152 pp., US$ 29.50. ISBN 0-86531-235-4

Oxygen consumption and ammonia production in elvers of varying growth rates were studied. The allometric equation describing the relationship between oxygen consumption and weight is y =00.638 x^0,525, where y is the oxygen consumption (mg/h) and x is the mass (g). The weight specific allometric equation for the relationship between ammonia excretion and weight is $\text{y}\text{x}\text{= 0.0129 x}{}^{\mathrm{0,465}}$. Slow growing elvers were found to have higher respiratory rates (0.737 mg O₂ h^?1 g^?1) than would be expected for their size.     

Aquaculture in Southeast Asia. A historical overview : Shao-Wen Ling. Washington Sea Grant Publication. University of Washington Press, Seattle and London, 1977. 108 pp., 5 figs., 11 illus., 19 tables, cloth US $ 19.50; pbk. US $ 7.50, ISBN 0-295-95560-0, ISBN 0-295-95563-5(pbk)

Existing open plankton pond techniques employed in Australian warm-water fish culture are outlined. The development of the covered plankton pond is traced and details of materials used, management and production over an 18-month period provided. The advantages of covered ponds, improved design features for further work and the significance of techniques develeped are briefly discussed.     

Aquaculture economics research in Asia: Proceedings of a workshop held in Singapore, 2–5 June 1981: IDRC,Ottawa, Canada, 1982. 128 pp., ISBN 639-3-003-(5). Available in the U.S.A. from Unipub,New York,NY, $15.00; in other countries from IDRC,Ottawa, Canada, $12.00

Propeller-aspirator-pump aerators of 0.38, 1.5, and 2.24 kW transferred averages of 1.73 to 1.91 kg oxygen/kW · h in standardized oxygen transfer tests (tap water; 20°C; 0 mg/l dissolved oxygen) conducted in a shallow basin (1.04 m of water depth). In comparison tests, spray-type surface aerators transferred 1.34 to 1.41 kg oxygen/kW · h and a diffused-air system transferred 1.08 kW · h. The water-mixing capabilities of aerators were estimated from the time to completely mix salt (NaCl) throughout the volumes of ponds, and from the time required to spread a dye over surfaces of ponds. The propeller-aspirator-pump was effective in mixing pond water. A 1.5-kW propeller-aspirator-pump spread dye over a 0.4-ha pond in 32 min and mixed salt throughout 3000 m³ of water in 90 min. A larger spray-type surface aerator (2.24 kW) required 1.5 h to spread dye and 1.75 h to mix salt in the same pond.     

Fish quarantine and fish diseases in Southeast Asia: Report of a workshop held in Jakarta, Indonesia, 7–10 December 1982. Ottawa, Canada, IDRC-210e, 1983. 79 pp., 7 illus., $5.00, ISBN 0-88936-376-5.

A surgical technique for extracting ovary samples from bullfrogs without altering ovarian development is described.