Comparative reproductive biology of three dominant myctophids of the genus Diaphus on the slope region of the East China Sea

Sassa, Chiyuki; Tanaka, Hiroshige; Ohshimo, Seiji

doi:10.1016/j.dsr.2016.06.005

Cited by 14 publications

(11 citation statements)

References 51 publications

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“…The ratio of males to females decreased with SL, and most individuals in the largest class were females, as observed in many other myctophids 37,39,40 . This variation in the sex ratio with length might be related to faster growth and/or a longer life span of females in relation to males 65 .…”

Section: Discussionsupporting

confidence: 69%

“…In other studies of myctophid species, for example, in the Diaphus and Benthosema genera, the range of size at maturation is between 24.5 and 120 mm SL 38,40,61 , depending on the growth rate of the species and the region in which it is found. This could be the reason we found variability in the size of first maturity in the same species.…”

Section: Discussionmentioning

confidence: 95%

“…Finally, 84 samples of female gonads were collected to estimate the batch fecundity (BF) 56,57 through the gravimetric method, which was calculated for each female as the number of oocytes per unit weight multiplied by the total ovarian weight 40 .The proportion of the subsample from which the oocytes were extracted was evaluated with a target coefficient of variation (CV) of oocytes per unit weight of less than 5% 58 . The oocytes were manually released from the ovarian stroma and then counted using a stereoscopic microscope.…”

Section: Methodsmentioning

confidence: 99%

“…The statistical analysis was performed using the R programming language (V.3.6.0) 60 . Batch fecundity data from other studies are also shown for comparison purpose 40,61 . We obtained the values from the data points of figures using GetData Graph Digitizer V.2.26.…”

Section: Methodsmentioning

confidence: 99%

“…Studies of the reproductive biology of species of the Myctophidae family are limited [27][28][29][30] and frequently have not considered fecundity type (determinate or indeterminate), which provides important information [31][32][33][34][35] . Typically, studies of the reproductive biology of the myctophids include information about sex ratio, oocyte development, sizes at sexual maturity, spawning seasons, fecundity, and spawning strategies 23,28,30,[34][35][36][37][38][39][40] , but this information is only available for a very few species.…”

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confidence: 99%

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Contribution to the reproductive ecology of Notoscopelus resplendens (Richardson, 1845) (Myctophidae) in the Central-Eastern Atlantic

Sarmiento‐Lezcano

Triay‐Portella

Guerra‐Marrero

et al. 2020

Sci Rep

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Notoscopelus resplendens is an abundant myctophid in the region of the Central-Eastern Atlantic. As with a majority of other myctophid species, this species performs vertical migration, playing a key role in the oceanic food web and in carbon sequestration. We examined the reproductive biology of N. resplendens based on 579 specimens caught between 1997 and 2002 off the Canary Islands. We found that the maximum standard length (SL) was lower than the size reported by other authors. The sex ratio was not different from 1:1. The average size at first maturity (L50) was higher in females (60.34 mm SL) than in males (56.61 mm SL). The gonadosomatic index (GSI) at 50% sexual maturity in females was higher than that in males. The reproductive activity was observed from January to April, while from May onwards, the majority of fish caught were in the process of maturation. The macroscopic scale of maturation was validated through the histological analysis of the ovarian development. The batch fecundity was related to the standard length, with an average of 1068.69 ± 369.84 eggs/spawn. These first data obtained for N. resplendens indicated that it is a batch spawner with asynchronous ovarian development.

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