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11 results for “Myctophidae”
F I G U R E A 1 Oocytes. Figure A1 in Reproductive biology of the electric lanternfish Electrona risso (Myctophidae) and the bigscale fishes Melamphaes polylepis and Scopelogadus mizolepis (Melamphaidae)
F I G U R E A 1 Oocytes. Figure A1: Oocytes of female Electrona risso per reproductive phase (see Table 1), photographed with reflected light. Photography by K. Wieben.
F I G U R E 5 in Reproductive biology of the electric lanternfish Electrona risso (Myctophidae) and the bigscale fishes Melamphaes polylepis and Scopelogadus mizolepis (Melamphaidae)
F I G U R E 5 Maturity ogives (solid lines) for females of (a) Electrona risso, (b) Melamphaes polylepis, and (c) Scopelogadus mizolepis. Vertical slashes are single observations, and open circles illustrate the proportions of mature individuals per 2-mm size class. Dotted lines are 95% C.I., and dashed lines and filled black dots indicate the length at which 50% of the individuals are mature (L). R2 values are 50 McFadden's R2.
F I G U R E 6 in Reproductive biology of the electric lanternfish Electrona risso (Myctophidae) and the bigscale fishes Melamphaes polylepis and Scopelogadus mizolepis (Melamphaidae)
F I G U R E 6 Gonado-somatic index of females of (a) Electrona risso, (b) Melamphaes polylepis, and (c) Scopelogadus mizolepis, per reproductive phase. I, immature; II, early developing; III, developing; IV, spawning capable; V, actively spawning (see also Table 1). All neighboring values differ significantly (p <0.05).
F I G U R E 4 in Reproductive biology of the electric lanternfish Electrona risso (Myctophidae) and the bigscale fishes Melamphaes polylepis and Scopelogadus mizolepis (Melamphaidae)
F I G U R E 4 Melamphaes polylepis ovarian development. Reproductive phases based on Table 1. Macroscopic development in female gonads (left panels) and histological cross-sections of ovaries (right panels). CA, cortical alveoli oocyte; GVBD, germinal vesicle (nucleus) breakdown oocyte; nu, nucleus; PG, primary growth oocyte; POF, postovulatory follicle; Vtg1–3, primary to tertiary vitellogenic oocyte; yg, yolk granules; yv, yolk vesicle. Photography by A. Knorrn.
F I G U R E 3 in Reproductive biology of the electric lanternfish Electrona risso (Myctophidae) and the bigscale fishes Melamphaes polylepis and Scopelogadus mizolepis (Melamphaidae)
F I G U R E 3 Electrona risso ovarian development. Reproductive phases based on Table 1. Macroscopic development in female gonads (left panels) and histological cross-sections of ovaries (right panels). A, atresia; CA, cortical alveoli oocyte; GVBD, germinal vesicle (nucleus) breakdown oocyte; GVM, germinal vesicle migration oocyte; HYD, hydrated oocyte; PG, primary growth oocyte; Vtg1–3, primary to tertiary vitellogenic oocyte; yg, yolk granules; yv, yolk vesicle. Photography by K. Wieben.
F I G U R E 1 in Reproductive biology of the electric lanternfish Electrona risso (Myctophidae) and the bigscale fishes Melamphaes polylepis and Scopelogadus mizolepis (Melamphaidae)
F I G U R E 1 Mesopelagic net sampling stations (circles) and locations where (a) Electrona risso, (b) Melamphaes polylepis, and (c) Scopelogadus mizolepis were caught (black circles) in the eastern Central Atlantic during the 383rd cruise of the FFS Walther Herwig III in March and April 2015. Land mass is shown in light gray and ocean in dark gray.
F I G U R E A 2 in Reproductive biology of the electric lanternfish Electrona risso (Myctophidae) and the bigscale fishes Melamphaes polylepis and Scopelogadus mizolepis (Melamphaidae)
F I G U R E A 2 Scopelogadus mizolepis ovarian development. Reproductive phases based on Table 1. Macroscopic development of female gonads (left panels) and histological cross-sections of ovaries (right panels). CA, cortical alveoli oocyte; GVM, germinal vesicle migration oocyte; nu, nucleus; PG, primary growth oocyte; Vtg1–3, primary to tertiary vitellogenic oocyte; yg, yolk granules; yv, yolk vesicle. Photography by A. Knorrn.
F I G U R E 2 in Reproductive biology of the electric lanternfish Electrona risso (Myctophidae) and the bigscale fishes Melamphaes polylepis and Scopelogadus mizolepis (Melamphaidae)
F I G U R E 2 Length–frequency distributions of (a) Electrona risso, (b) Melamphaes polylepis, and (c) Scopelogadus mizolepis by sex (upper panels, females; lower panels, males).
Data from: The rise to dominance of lanternfishes (Teleostei, Myctophidae) in the oceanic ecosystems: a paleontological perspective
<p>Lanternfishes currently represent one of the dominant groups of mesopelagic fishes in terms of abundance, biomass and diversity. Their otolith record dominates pelagic sediments below 200 m in dredges, especially during the entire Neogene. Here we provide an analysis of their diversity and rise to dominance primarily based on their otolith record. The earliest unambiguous fossil myctophids are known based on otoliths from the late Paleocene and early Eocene. During their early evolutionary history myctophids were likely not adapted to a high oceanic lifestyle, but occurred over shelf and upper slope regions where they were locally abundant during the middle Eocene. A distinct up-scaling in otolith size is observed in the early Oligocozoicne, which also marks their earliest occurrence in bathyal sediments. We interpret this transition to be related to the change from a halothermal deep ocean circulation (HTC) to a thermohaline regime (THC), and the associated cooling of the deep ocean and rearrangement of nutrient and silica supply. The early Oligocene myctophid size acme shows a remarkable congruence with diatom abundance, the main food resource for the zooplankton and thus for myctophids and whales. The warmer late Oligocene to early middle Miocene period was characterized by an increase in disparity of myctophids but with a reduction in their otolith sizes. A second and persisting secular pulse in myctophid diversity (particularly within the genus <i>Diaphus</i>) and increase in size begins with the Biogenic Bloom in late Miocene, paralleled with diatom abundance and mysticete gigantism</p>
Data from: The rise to dominance of lanternfishes (Teleostei, Myctophidae) in the oceanic ecosystems: a paleontological perspective
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T A B L E A 1 in Reproductive biology of the electric lanternfish Electrona risso (Myctophidae) and the bigscale fishes Melamphaes polylepis and Scopelogadus mizolepis (Melamphaidae)
T A B L E A 1 Oocyte sizes of Electrona risso per reproductive phase (see Table 1).
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