Journal of Tropical Oceanography ›› 2019, Vol. 38 ›› Issue (4): 41-51.doi: 10.11978/2018100CSTR: 32234.14.2018100

Special Issue: 南海专题

• Marine Biology • Previous Articles     Next Articles

Energy accumulation and allocation of somatic and reproductive tissues in medium form of male Sthenoteuthisoualaniensis in the South China Sea

Kai ZHU1,Lichuan ZHANG1,Xinjun CHEN1,2,3,4,Jixiang YAO1,Fei HAN1,Dongming LIN1,2,3,4()   

  1. 1. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
    2. Key Laboratory of Sustainable Exploitation of Oceanic Fishery Resources, Shanghai Ocean University, Ministry of Education, Shanghai 201306, China
    3. National Distant-water Fisheries Engineering Research Center, Shanghai Ocean University, Shanghai 201306, China
    4. Collaborative Innovation Center for Distant-water Fisheries, Shanghai 201306, China
  • Received:2018-10-01 Revised:2019-02-22 Online:2019-07-20 Published:2019-07-21
  • Supported by:
    National Natural Science Foundation of China((NSFC41276156););National High TechnologyResearch and Development Program (863 Program)((2012AA092303););Natural Science Foundation of Shanghai (16ZR1415400)((16ZR1415400););Shanghai Ocean University College Students' innovation training program((B1-5002-17-0001-2).)

Abstract:

The energy accumulation and allocation of somatic and reproductive tissues in the medium form of male Sthenoteuthisoualaniensiswere were analyzed by using the technology of energy density determination combined with residual analysis. The results showed that the energy density of mantle, fins, arms, spermatophoric complex, and testis were 21.16±1.44, 21.98±1.51, 21.44±1.50, 20.83±1.70, and 21.41±1.70kJ·g -1, respectively. The energy density for tissue of mantle or spermatophoric complex varied significantly depending on sexual maturity stages, while there were no significant differences between sexual maturity stages for the tissue of fins, arms, or testis. The total energy accumulation for each individual was estimated at 299.31±90.81 kJ, and showed an increasing trend with body size growth. With regards to relative energy accumulation, the somatic tissues, including mantle, fins and arms, accounted for 95.31%~98.04% of the total energy accumulation, but decreased with maturation. The relative energy accumulation in reproductive tissues, being testis and spermatophoric complex, accounted for 1.96%~4.96% of the total energy accumulation, and increased with maturation, in which the maximum value was reached at stage V. The analysis of residuals of relationship between tissue absolute energy accumulation and mantle length, using Model II regression, showed a significantly positive correlation between somatic and gonadal tissues. This evidence suggests that there was no energy remobilization of somatic tissues to fuel reproduction during sexual maturation, and the mode of reproductive investment is more likely to be income breeding in the medium form of male S.oualaniensis. In this study, we preliminary established the progress of energy accumulation and its allocation in soma and reproductive organs for medium form of male S.oualaniensisin the South China Sea. These findings should assist future research on its reproductive strategy, as well as sustainable utilizationof this kind of resource in the area.

Key words: Sthenoteuthisoualaniensis, male, reproductive strategy, energy investment, South China Sea