Lisheng Wu, Wenxin Zhuang, Qiaohong Liu, Rui Wang, Yuan Li, Longshan Lin, Shufang Liu, Shaoxiong Ding. Pilot study to reconstruct life history of Diaphus thiollierei from the Arabian Sea by otolith microstructure and microchemistry[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2307-x
Citation:
Lisheng Wu, Wenxin Zhuang, Qiaohong Liu, Rui Wang, Yuan Li, Longshan Lin, Shufang Liu, Shaoxiong Ding. Pilot study to reconstruct life history of Diaphus thiollierei from the Arabian Sea by otolith microstructure and microchemistry[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2307-x
Lisheng Wu, Wenxin Zhuang, Qiaohong Liu, Rui Wang, Yuan Li, Longshan Lin, Shufang Liu, Shaoxiong Ding. Pilot study to reconstruct life history of Diaphus thiollierei from the Arabian Sea by otolith microstructure and microchemistry[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2307-x
Citation:
Lisheng Wu, Wenxin Zhuang, Qiaohong Liu, Rui Wang, Yuan Li, Longshan Lin, Shufang Liu, Shaoxiong Ding. Pilot study to reconstruct life history of Diaphus thiollierei from the Arabian Sea by otolith microstructure and microchemistry[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2307-x
State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
2.
Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China
3.
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
Funds:
Laoshan Laboratory under contract No. LSK202203802; the National Programme on Global Change and Air-Sea Interaction under contract No. GASI-02-SCS-YD sum/spr/aut.
The lanternfishes are mesopelagic fish that are highly productive as common bycatch of deep-sea shrimp trawlers, but they are often neglected or discarded. Despite being one of the dominant lanternfish species in the Arabian Sea, little is known about the life history of Diaphus thiollierei and its role in marine ecosystems. In this study, 103 D. thiollierei were collected in the Arabian Sea during October-November 2020 to study population growth based on sagittal otolith daily ages; and 10 fish collected during April-May 2021 were subjected to otolith microchemistry analysis to reconstruct the vertical migration in their life history using LA-ICP-MS technique. The standard length–dry weight (SL-DW) relationships for D. thiollierei revealed both negative allometric growth and a significant difference between the sexes. Using daily growth annuli counts on the sagittal section of otoliths, the von Bertalanffy growth equation for D. thiollierei was determined. The pattern of four elemental ratios (Sr to Ca, Mg to Ca, Li to Ca, and Ba to Ca) in sagittal otolith suggested that, in general, D. thiollierei descended continually after hatching until the post-larval (PL) stage when they reached a depth of approximately 200 m. Subsequently, from the PL stage to the post-metamorphosis II (PM II) stage, D. thiollierei likely further sank from 200 m to a depth of approximately 300 m, and then in the daytime they were at a depth of approximately 300-800 m to take refuge from predators. This pilot study explored to unravel the vertical migration during life history in D. thiollierei from sagittal otoliths, whereas further investigation on otolith is needed to better delineate the population ecology in detail, and thus to provide basic information for the exploitation of the lanternfish resource and the understanding of their ecological roles.
Figure 2. Light micrographs of sagittal otolith from a female Diaphus thiollierei with 55.4 mm SL and 139 d age. a. Longitudinal section in which dark and light bands suggesting daily increments; b. the same otolith showing schematic diagram of laser ablation for chemistry analyses and six life history stages: primordium (nucleus, N), larval (L), postlarval (PL), postmetamorphic I (PM I), postmetamorphic II (PM II), and postmetamorphic III (PM III) stages. The red circles represent spot raster for LA-ICP-MS.
Figure 3. Frequency distributions of daily age (a) and hatch date (b) of Diaphus thiollierei caught in the Arabian Sea from October to November 2020.
Figure 4. The von Bertalanffy growth function fitted to the relationship between daily age and standard body length. Blue for male and red for female.
Figure 5. The ratios of each otolith element to Ca concentration along the line transects from the core (0 μm) to the edge of the sagittal plane of D. thiollierei. The gray dots indicate the ratio point value of each otolith element to Ca, while the solid black line and blue block indicate the median and average values of all specimens, respectively. The vertical dashed lines separate the six life history stages. N, nucleus (primordium); L, larval; PL, postlarval; PM I, postmetamorphic I; PM II, postmetamorphic II; and PM III, postmetamorphic III stages.
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