Boehlert, Muneharu Kusakari, Juro Yamada. Reproductive performance of yellowtail rockfish, Sebastes flavidus. Maxwell B. Eldridge, Jeannette A. Whipple, Michael J.
Bowers, Brian M. Jarvis, Jordan Gold. Staging and the time course of embryonic development in kurosoi, Sebastes schlegeli. Reproduction and development of Sebastes in the context of the evolution of piscine viviparity. Ontogeny of the sodium pump in embryos of rockfish of the genus Sebastes. Frank P. Ontogeny of the immune system in Sebastiscus marmoratus : histogenesis of the lymphoid organs and effects of thymectomy. Uptake and utilization of 14 C-glycine by embryos of Sebastes melanops. Ultrastructure of the epidermis and digestive tract in Sebastes embryos, with special reference to the uptake of exogenous nutrients.
Yoklavich, George W. Boehlert, Juro Yamada. Energy utilization by embryos during gestation in viviparous copper rockfish, Sebastes caurinus. Systematics and identification of larvae and juveniles of the genus Sebastes.
Allozyme polymorphisms permit the identification of larval and juvenile rockfishes of the genus Sebastes. Ecology of pelagic larvae and juveniles of the genus Sebastes. The ecology of substrate-associated juveniles of the genus Sebastes.
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Milton S. Love, Mark H. Carr, Lewis J. Mariculture of kurosoi, Sebastes schlegeli. Most nearshore rockfishes examined appear to have lifespans of moderate longevity, with maximum ages between 20 and 30 years. Weight-length relationships were calculated for 16 species of rockfish and for cabezon, kelp greenling, and lingcod.
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Reproductive patterns were determined for 18 species of rockfish and size at sexual maturation for 17 of these species. The majority of nearshore rockfishes appear to release larvae during the winter-spring period. However, timing of larval extrusion is species specific and must be examined on a case-by-case basis. General food habits were described for 11 species of rockfish. An Appendix, summarizing life-history characteristics for the 17 most commonly encountered species in this study, is included.
We conclude that the nearshore rockfishes are a valuable marine resource to the State of California and should be managed with the realization that, as with many of the world's fishery resources, they are vulnerable to human impacts and over exploitation.
Unlike previous histories on the subject the last being in , this one is fully documented by primary references to the original publication or other sources. There are also explanations as to why some of the previous errors occurred. The detailed history of each introduction, including the primary references, is given. The subsequent history and status of each species in California is given. The attitude of administrators, ichthyologists, fish culturists, fishery biologists, fishermen, and the public toward each introduction is given, and there is a discussion of their value.
There is, with respect to California, a review of the present regulations concerning introduced fishes, and a prognostication of the future concerning them.
Approximately full species of freshwater and euryhaline fishes occur in California. Salton Sea fishes are excluded. Another five subspecies or races have become established. Twelve introduced fishes have uncertain status. Thirty-nine, including one marine fish which was deliberately introduced, have achieved no lasting success. Eight introduced fishes are listed as "hypothetical. Three species have been listed erroneously in scientific papers as having been introduced. About 26 other species have been formally suggested as introductions.
Three species are likely candidates for introduction.
Our study focused on the status of the marine recreational fishery along the northern and central California coast, where surveys of recreational fishing effort and catch were conducted from —61 and from — Between the two surveys, annual recreational fishing effort rose from 1. Annual recreational catch rose from 3. The average number of fish caught per day decreased for fishing from piers 1.
The variety of different fish species caught in a typical day of fishing from boats decreased, but variety from shore increased. Rockfish Sebastes spp. Between the two surveys, recreational catch of rockfish rose from 1. Average weight decreased in 12 of 16 major rockfish species. The 12 species were mainly shallow-water m species or species with wide depth ranges.
Signs of population stress were found in blue rockfish S. Abrupt declines in lengths of blue rockfish and yellowtail rockfish occurred in central California between and The major species generally had smaller fish and fewer successful year-classes in central California than northern California. Catches of lingcod Ophiodon elongatus, a trophy species of importance to both boat and shore fishing, have been in slow oscillating decline since the early s.
It is unclear whether the decline is due to overharvest and is a long-term trend that will continue, or if it is due to natural population fluctuations.
Fishes of the surfperch family Embiotocidae dominated catch from shore in both surveys. Barred surfperch Amphistichus argenteus and redtail surfperch A. White seaperch Phanerodon furcatus stocks may have collapsed prior to the —61 survey. Populations of lingcod and five of six rockfishes examined for interannual length-frequency trends were found to be subject to wide variation in recruitment from year to year. Strong year-classes often dominated a species' catch for several consecutive years.
Ten pelagic fish species albacore Thunnus alalunga, bigeye tuna T. California's drift gill net fishery developed rapidly in the late s off southern California.
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The fishery originally targeted the common thresher Alopias vulpinus. Almost immediately swordfish Xiphias gladius and shortfin mako Isurus oxyrinchus became important components of the catch. We examined and summarized data obtained from the California logbook system, landing receipts, and market samples taken from this fishery over the 10 fishing seasons from —82 through — During this period the fishery evolved from a small nearshore experiment to a major California fishery. Significant changes in nearly every aspect of the fishery occurred including boats and gear, techniques and regulations, fishing areas and seasons, and targeted species.
These data form a base line from which changes in the fishery and harvested stocks can be compared in the future. The drift gill net fishery operates primarily in the area between San Diego and Cape Mendocino and concentrates much of its effort on swordfish in the Southern California Bight during the months of May to December. This decrease in effort corresponds to a decrease in total landings of approximately the same proportions.
Average sizes of swordfish showed no change during the —82 to —91 fishing seasons. This may indicate a decline in the common thresher stock or reflect changes in the season and area of fishing operations. A number of problems and conflicts occurred during the first 10 years of the fishery e.