Coastal pelagic fish

Coastal pelagic fish

We extend a framework of comparative climatology of reproductive habitats of neritic pelagic fishes, heretofore focused on temperate eastern ocean upwelling systems, by adding a tropical western ocean example. Maritime weather reports off southeastern Brazil are summarized to yield distributions of wind stress, Ekman transport, wind mixing index, insolation, cloud cover and sea surface temperature for two-month segments of the seasonal cycle. These are used to describe seasonal aspects of the oceanography of the region. Vigorous coastal upwelling occurs in the vicinity of Cabo Frio-Cabo Sāo Tomé through most of the year, relaxing only during austral fall. Directly downstream of this upwelling center lies the coastal bight between Cabo Frio and Cabo Santa Marta Grande, within which offshore Ekman transport and wind-induced turbulent mixing fall to coastwise minima. The near-coastal water column within the bight, while vertically homogeneous during winter, becomes stably stratified during summer. We infer a rather enclosed circulation pattern within the bight, with the main Brazil Current flow skirting across the bight opening rather than following the coastline into the bight interior. This coastal bight constitutes the primary reproductive habitat of the Brazilian sardine. Peak spawning activity during summer serves to place larvae into a stable, enriched environment, where they enjoy high likelihood of retention. In the manner of achieving these advantages, the reproductive strategy of this population appears to be a nearly exact analogue to those of sardine populations inhabiting eastern boundary current upwelling systems, in spite of its western ocean boundary location and the fact that a warmer water genus is involved. The conclusion is that this Sardinella population is solving similar dominant environmental problems to those faced by the more temperate Sardinops and Sardina stocks of eastern boundary systems, only at a warmer temperature range. These findings lend support to the idea that our various fragments of experience of environmental effects on fish populations are not unconnected anecdotes, as they are often treated, but are amenable to scientific generalization.


Sea Frontiers 1974 Jan.- Feb. (Pelagic Adaptations, Artificial Reefs, freedom to fish, king of the winged boats, 20)
Book (american color plate)

Fish Stocks/ Windpower/ Wave Generators

2006-11-14 00:23:43 by jaybug39

I have read that ocean fish stocks will be gone in a few years. And I have been thinking since I heard that Massachusetts refused to build wind turbines in Long Island Sound as they were unattractive, why not build some in the pacific where we could create national sea life refuges?
This would help out coastal communities in several regards. Some people would come see the turbines, much like some people visit lighthouses. The energy produced would ease any difficulties coastal communities may face from their currently existing long distance power transmissions. And they would get the benefit of knowing that fish will be around in the future


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