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- W2337043344 abstract "Direct evidence is presented that the sagittae of nehu, Stolephorus purpureus, grow by discernible daily incrementa. Agmg by daily growth incrementa provides the means to establish a general growth curve for the filat 6 mo of life for this species. Adult nehu exhibit nearly linear growth between 30 and 60 mm standard length. Preliminary evidence is presented that the nehu population of Pearl Harbor may grow more rapidly than that of Kaneohe Bay. Attempts to age tropical fishes by conventional methods have generally been thwarted by the absence of well-defined annuli in calcarious structures and protracted spawning periods which make length-frequency mode progression analyses difficult. Recognizing that exceptions to the above statement exist, Pannella’s work (1971) providing indirect evidence of the presence of daily growth layers and periodical deposition patterns in the sagittae (otoliths) of three species of boreal fishes from the western North Atlantic suggested a means for conducting age and growth studies of tropical species. He concluded in that report: “Preliminary observation of growth patterns in sagittae of other species, living at various depths and different climates, appears to support the idea that daily growth may be a universal feature of fish otoliths.” Pannella’s (1974) later work in Puerto Rico provided circumstantial evidence of daily growth layers in sagittae of several species of tropical fishes. To gain direct evidence that daily growth increments exist in tropical fishes we studied the nehu, Stolephorus purpureus Fowler, a small engraulid endemic to the Hawaiian Islands. The nehu is the basis of a live-bait fishery producing about 4,000 metric tons annually of skipjack tuna, Kutsuwonus pelurnis (Linnaeus), from the vicinity of the Hawaiian Islands. Stolephorus purpureus is a short-lived species (less than 1 yr) and has been the subject of relatively numerous studies: Nakamura (1970) has summarized the biological ‘Southwest Fisheries Center, Honolulu Laboratory, National Marine Fisheries Service, NOM, Honolulu, HI 96812. knowledge of this species available through 1965. Our work provides evidence of the presence of daily growth increments in the sagittae of nehu and permits the assembly of a growth curve for the first 6 mo of life for this species. Brothers et al. (1976) have recently demonstrated the presence of daily growth increments in larval Engraulis morahx Girard and Leuresthes tenuis (Ayres) and presented evidence that the phenomenon occurs in several other species of California fishes." @default.
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- W2337043344 date "1976-01-01" @default.
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- W2337043344 title "AGE AND GROWTH OF THE NEHU, STOLEPHORUS PURPUREUS (PISCES: ENGRAULIDAE), FROM THE HAWAIIAN ISLANDS AS INDICATED BY DAILY GROWTH INCREMENTS OF SAGITTAE" @default.
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