Abstract: An improvement over the prior invention, U.S. Ser. No. 781,697, filed Mar. 28, 1977, now U.S. Pat. No. 4,137,869 wherein was disclosed a platform maintained below the surface waters which are not naturally suitable for production of marine food. Means is provided to supply nutrients to the platform at a controlled rate. The platform is located at such depth that solar or other illumination causes the nutrients to reinforce the natural eco-system, thereby increasing the production of fish which may be harvested as food. A feature of the improvement is that the platform is formed of modular segments which may be independently added or removed as a means for controlling available habitat or for servicing the platform. Further improvements in the controls for nutrients and for maintaining buoyancy are disclosed. Also clusters of tubes having buoyancy means may be secured to the platform to augment production, or may be independently secured at a distance from the platform.

Abstract: A light source, preferably within the camera, exposes film prior to exposure to the scene. The image is enhanced over normal exposure, particularly in photographing shadows and low light levels. Pre-exposure overcomes the reluctance of film chemicals to activation.

Abstract: A platform is maintained at a fixed or controlled variable distance below the surface of waters which do not naturally have a substrate suitable for production of marine food; e.g. beyond the continental shelf. Nutrients (e.g. waste biological products) are supplied to the platform, preferably at a controlled rate. The depth of the platform is such that solar energy or other illumination causes the nutrients to reinforce the natural ecosystem, thereby increasing the production of fish which may be harvested as human food.