Download Free Swimbladder Morphology Of Some Mesopelagic Fishes In Relation To Sound Scattering Book in PDF and EPUB Free Download. You can read online Swimbladder Morphology Of Some Mesopelagic Fishes In Relation To Sound Scattering and write the review.

An examination was made of fresh and preserved specimens of Pacific lantern fishes, hatchet fishes, and hake. Most of the lantern fishes under 50-mm standard length contain gas in their swimbladders and, hence, are probably major sound scatterers. The hatchet fishes possibly contribute to scattering of nonmigratory layers. The resonance depths of the swimbladders differ widely for sound of different frequencies. Because of its larger size, the swimbladder of the hake should resonate at low frequencies.
A fish species can be called mesopelagic if it spends the day in the mesopelagic zone. The mesopelagic zone has been defined in different ways based on depth, temperature and light regimes. For the present purpose, depth seems to be the best criterion and mesopelagic fish can thus be defined as species generally spending the day at depths between approximately 200 and 1 000 m. Generally they perform a diel migration, coming to the upper 200 m or even to the surface during the night. The present report briefly reviews the systematics ecology and life history of important groups of mesopelagic fish. Further, some methods used for abundance estimation of these fish are described and discussed. The bulk of the report reviews the present knowledge of abundance and species composition of mesopelagic fish in each of the FAO statistical areas. Although the data in most cases are few, an attempt has been made to give tentative estimates of the biomass and production in the various areas. When available, information on the life history of the most important species in each area is also given.
“A masterful accomplishment—Allen, Pondella and Horn have assembled a talented team of experts who produce authoritative, up-to-date accounts. This book will be used as the primary text in many fish biology courses and as a valuable reference elsewhere. Here is a wealth of data waiting to be mined by legions of graduate students as they generate the new ideas that will motivate marine ecology for years.”—Peter Sale, Editor of Coral Reef Fishes: Dynamics and Diversity in a Complex Ecosystem "A copiously illustrated and comprehensive interpretation of the past, present, and future state of over 500 species of fishes in Californian waters. A compilation of virtually all the many important studies on the ecology of California marine fishes."—Bruce B. Collette, National Marine Fisheries Service and co-author of The Diversity of Fishes