Researches on the morphological and growing characteristics of cultured Sepiella maindroni beak
XU Xiaoxuan
SUI Youzhen
ZHANG Tao
LIU Lianwei
XU Kaida
ZHU Wenbin
XU Hanxiang
ZHOU Yongdong
LIU Shuhan
ZHU Kai
Abstract：As one of the important economic cephalopods in Zhejiang coastal waters,Sepiella maindro-ni plays an important role in ecosystem.Its hard tissue,beak,can be used as an important material for the studies of fishery ecology.Morphological and growing characteristics of 494 pairs of beaks of S.maindroni were studied.The principal component analysis showed that the upper hood length(UHL),the upper crest length(UCL),the lower crest length(LCL)and the lower wall length(LLWL)can be selected as an analysis parameters of external morphological characteristics of beak.Covariance analysis(ANCOVA)showed that there is significant difference among all external morphological parameters and between sexes(P＜0.01).Akaike's information criterion confirmed that the power function is the best for describing the relationship between mantle length(ML)and UCL,ML and LLWL of males and females,and that of ML and UHL of females.The relationship between LCL and ML of females was optimally described by the exponential function while that between UHL and UCL of males was best fitted with ML by logarithm function.The absolute growth and the relative growth rates of beaks decreased when the daily age of S.maindroni increased with their minimum value appeared at 86 to 95 daily age.The determination of external morphological analysis parameters of beaks and its relationship with ML can be used to identify the populations of S.maindroni.In addition,the growth characteris-tics of beaks can provide a scientific basis for the studies of feeding ecology in large-scale cultivation of S.maindroni.
Keywords：Sepiella maindroniartificial breedingbeakexternal morphological parametergrowth characteristics
Publication Date：2025-06-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 98-105 )