Volume 40, Issue 2
August 1954, pages 25-68
pp 25-37 August 1954
pp 38-43 August 1954
pp 44-48 August 1954
The body weight and humeri of mature rats fed for 30 days with diets containing 5, 10, 12.5, 15, 17.5 and 20% prawn protein have been determined. The following conclusions are drawn:
A diet containing 5% prawn protein will not support the body weight of mature rats, while diets containing 10, 12.5, 15, 17.5 and 20% protein permit an increase in body weight in approximate proportions.
A diet containing 12.5% prawn protein supports a degree of skeletal constitution in mature rats equal to that of a diet containing 15% prawn protein.
5 and 10% prawn protein diets are inadequate to support normal skeletal constitution.
The compositions of the bone ash is not affected by feeding prawn protein deficient diets to mature rats.
pp 49-57 August 1954
pp 57-57 August 1954 Erratum
pp 58-68 August 1954
Gaps have been filled in the known distribution ofHarpodon nehereus.
The extreme limits of distribution are fixed.
Geographical and oceanographical features of the area are examined and co-relations established between them and the occurrence and abundance of the fish.
The 80° F. July isotherm and the abundance of food in the sea opposite the months of flooded rivers more than low salinity apparently provide the optimum conditions for the shoreward shoaling of ‘Bombay Duck’.
Estuaries and islands as additional factors influencing the abundance or absence of the fish, are discussed and a shoreward and seaward migration inferred. Additional proofs for this migration are adduced.
Gunther’s theory of the deep sea origin of the ‘Bombay Duck’ is revived and a bathy- or mesopelagic habitat is postulated.
The primary purpose of the migration from deep water to low warm surface water is probably for spawning. The young fish of 20 mm. length and more along with full sized fish resort to the coastal waters for feeding.