About
21
Publications
2,112
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
157
Citations
Citations since 2017
Introduction
Mikimasa Joh currently works at the Mariculture Fisheries Research Institute, Hokkaido Research Organization, Japan. Mikimasa does research in Fish early life ecology and Fisheries Resources Management. Their current project is 'Ecology of cold demersal fishes for smart fisheries managements.'.
Skills and Expertise
Publications
Publications (21)
The present study reared larvae and juveniles of barfin flounder Verasper moseri, observed otolith microstructure and validated daily formation of micro rings on sagittae and lapilli. For both otoliths, the check distinct ring was observed near the otolith core and the timing of check formation coincided with mouth opening. In lower water temperatu...
The present study established an age determination technique and analyzed growth patterns in three sculpins, Myoxocephalus jaok, Enophrys diceraus, and Gymnocanthus herzensteini, which are major components of demersal fish assemblages in the subarctic Pacific. In all three species, only two or three otolith opaque zones were detected by surface obs...
Hatch date and settlement date distribution and planktonic larval duration (PLD) in yellow striped flounder in nursery grounds in the northern Japan Sea and in the Okhotsk Sea around Hokkaido (Northern Japan Sea–Okhotsk Sea population) were investigated. We examined the relationship between the ecological features and water temperature in these two...
We investigated the relationship between morphological development in the embryonic stage and the formation of otolith microstructure in Arabesque greenling Pleurogrammus azonus, and then validated that the otolith increments were formed on a daily basis. Increments were more consistent to count and measure in sagittal otoliths from wild caught lar...
The migration, growth, and exposed water temperature of immature giant octopuses (Enteroctopus dofleini) were investigated in the coastal Okhotsk Sea area of Hokkaido using the mark and recapture method. Disk tags were used to document the migration and growth patterns, and data loggers were used to measure exposed temperature. Data loggers were al...
To characterise food-habit differences in Pseudopleuronectes herzensteini juveniles we compared diets, prey diversity and nutritional states between two groups, i.e., one in the Sea of Japan and the other in the Sea of Okhotsk around northern Hokkaido, Japan. Juveniles were collected with a sledge net along the sea bottom at depths of 8–50 m in Aug...
Otolith microstructure of reared and wild cresthead flounder Pseudopleuronectes schrenki larvae and juveniles was used to investigate the daily periodicity of ring formation, morphological change and unique otolith structure related to important life events. By comparing microstructural features of P. schrenki with those reported for other flatfish...
Flatfishes drastically change their habitat, body form, and feeding during metamorphosis; thus, the early juvenile and larval stages are viewed as being critical for early survival. However, to the best of our knowledge, no studies have tested the growth-mortality hypothesis for both larval and juvenile stages of flatfishes. Therefore, we investiga...
Brown sole Pseudopleuronectes herzensteini larvae and juveniles were reared to validate daily otolith ring formation. At 15°C, a check (a distinct ring) formed on the
sagittae and lapilli at 6days after hatching, and clear increments regularly formed outside the check. For both otoliths,
the relationship between the number of days after hatching an...
To examine survival processes in marbled sole Pseudopleuronectes yokohamae larvae, nutritional-transition-date distributions (NTDDs) were compared between larvae and large juveniles (LJs) in Hakodate Bay from 2001 to 2003. NTDDs were used instead of hatch-date distributions because the onset of increment formation coincides with the timing of the t...
We validated the daily formation 0f otolith increments of reared fat greenling Hexagrammos otakii larvae and examined the growth patterns of wild lavae. The mean notochord Length and otolith radius of newly hatched larvae were 8.31 mm and 273μm, respectively. Newly hatched larvae had some increments on their lapilli and a check was formed at hatchi...
Maternal effects of animals are the phenotypic influences of age, size, and condition of spawners on the survival and phenotypic traits of offspring. To clarify the maternal effects for marbled sole Pseudopleuronectes yokohamae, we investigated the effects of body size, nutrient condition, and growth history of adult females on egg size, larval siz...
An investigation was conducted to evaluate the annual variation in potential predation impact (PPI) on larval and juvenile Pseudopleuronectes yokohamae by Crangon uritai in Hakodate Bay using predator–prey size relationships. Laboratory experiments were designed to estimate the favorable prey size of C. uritai through back-calculation of body lengt...
We examined the daily deposition of otolith increments of marbled sole (Pseudopleuronectes yokohamae) larvae and juveniles by rearing experiments, and estimated the growth pattern of wild larvae and juveniles in Hakodate Bay (Hokkaido Island, Japan). At 16C, prominent checks (inner checks; ca. 19.8m in diameter) were observed on the centers of sagi...
The crangonid shrimp Crangon uritai is one of the predators for marbled sole Pseudopleuronectes yokohamae juveniles in the coastal area of Hakodate Bay, Japan. The catch efficiencies of Hirota's sledge net (mouth size: 60 cm width and 40 cm height) with a distance wheel for C. uritai and P. yokohamae juveniles were obtained to estimate their accura...
To examine predation on larval and juvenile Pleuronectes yokohamae by Crangon uritai, the spatial distribution and feeding habits of C. uritai were studied. Crangon uritai fed on various prey, including P. yokohamae. Density-dependent predation on juvenile Crangon spp., larval and juvenile gobiid fish Chaenogobius heptacanthus, mysids, and gammarid...
During the spring in the coastal waters of Hakodate Bay the shrimp Crangon uritai is the predominant predator on larval and juvenile marbled sole, Pleuronectes yokohamae. To investigate the prey preferences of C. uritai, P. yokohamae and two other prey species, a mysid Nipponomysis sp. and a gammarid Haustorioides japonicus, were used for predation...
To estimate the live body length of marbled sole larvae from a preserved specimen, the notochord-length (NL) shrinkage due to preservation was investigated. In 5% formalin solution, significant shrinkage was observed in all NL classes after 30 days and 1.5 years preservation (5.2% and 6.3% in the 2.8-5.0 mm class; 3.3 and 3.8% in the 5.1-7.0 mm cla...
Projects
Project (1)
We promote production processes of demersal fishes, like walleye pollock, red halibut, Arabesque greenling, and others. I recently focus on effects of environmental changes for somatic and gonadal conditions, especially recent water-temperature rise and frequently occurred hypoxia on sea floor. We aim for natural enhancement of demersal fishes' populations using smart fisheries managements without price-drops of commercial targeted fishes.
