Identification and estimation of size from the beaks of 18 species of cephalopods from the Pacific Ocean

Wolff, Gary A. (1984) Identification and estimation of size from the beaks of 18 species of cephalopods from the Pacific Ocean. NOAA/National Marine Fisheries Service, (NOAA Technical Report NMFS, 17)

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Abstract

A method of identifying the beaks and estimating body weight and mantle length of 18 species of cephalopods from the Pacific Ocean is presented. Twenty specimens were selected from each of the following cephalopod species: Symplectoteuthis oualaniensis, Dosidicus gigas, Ommastrephes bartramii, S. luminosa, Todarodes pacificus, Nototodarus hawaiiensis, Ornithoteuthis volalilis, Hyaloteuthis pelagica, Onychoteuthis banksii, Pterygioteuthis giardi, Abraliopsis affinis, A. felis, Liocranchia reinhardti, Leachia danae, Histioteuthis heteropsis, H. dofleini, Gonalus onyx, and Loligo opalescens. Dimensions measured on the upper and lower beak are converted to ratios and compared individually among the species using an analysis of variance procedure with Tukey's omega and Duncan's multiple range tests. Significant differences (P =0.05) observed among the species' beak ratio means and structural characteristics are used to construct artificial keys for the upper and lower beaks of the 18 species. Upper and lower beak dimensions are used as independent variables in a linear regression model with mantle length and body weight (log transformed). (PDF file contains 56 pages.)

Item Type: Monograph or Serial Issue
Title: Identification and estimation of size from the beaks of 18 species of cephalopods from the Pacific Ocean
Personal Creator/Author:
CreatorsEmail
Wolff, Gary A.
Series Name: NOAA Technical Report NMFS
Number: 17
Date: 1984
Publisher: NOAA/National Marine Fisheries Service
Issuing Agency: United States National Marine Fisheries Service
Subjects: Ecology
Fisheries
Biology
Item ID: 2805
Depositing User: Patti M. Marraro
Date Deposited: 11 Nov 2009 13:06
Last Modified: 29 Sep 2011 18:22
URI: http://aquaticcommons.org/id/eprint/2805

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