FI871798A - MAETARRANGEMANG FOER EN FISKRAEKNEANORDNING. - Google Patents

MAETARRANGEMANG FOER EN FISKRAEKNEANORDNING. Download PDF

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Publication number
FI871798A
FI871798A FI871798A FI871798A FI871798A FI 871798 A FI871798 A FI 871798A FI 871798 A FI871798 A FI 871798A FI 871798 A FI871798 A FI 871798A FI 871798 A FI871798 A FI 871798A
Authority
FI
Finland
Prior art keywords
rods
fish
beams
rod
receiver
Prior art date
Application number
FI871798A
Other languages
Finnish (fi)
Other versions
FI80529B (en
FI80529C (en
FI871798A0 (en
Inventor
Lauri Olavi Niskala
Original Assignee
Kemijoki Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kemijoki Oy filed Critical Kemijoki Oy
Priority to FI871798A priority Critical patent/FI80529C/en
Publication of FI871798A0 publication Critical patent/FI871798A0/en
Publication of FI871798A publication Critical patent/FI871798A/en
Publication of FI80529B publication Critical patent/FI80529B/en
Application granted granted Critical
Publication of FI80529C publication Critical patent/FI80529C/en

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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81—Aquaculture, e.g. of fish

Landscapes

  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

The invention concerns a method and an arrangement for counting fish one at a time using a counting device in which a curtain of beams is formed using several pairs of transmitters and receivers which are connected to an electronic counting unit. When the fish swim through the curtain of beams formed in an opening 2 they cause a change in the activation of the receiver sensors 5 whereby the sum of the outgoing currents from the receiver sensors 5 varies as a function of the breadth of the fish. On the basis of the changing points of the sum of the currents, recording of the fish can be carried out one at a time. The arrangement comprises pairs of rods 4, 6 located on opposite sides of the opening 2 in the measuring flanges 1, which rods are installed in pairs essentially in the same straight line, where the outer surface of the rods is profiled and covered with a radiation absorbing substance. By this means, total reflection occurring inside the rods is prevented and only the beams 14 originating from the radiation source 3 in the longitudinal direction of the rod 4 go from the transmitter rod 4 across the measurement opening 2 to the corresponding receiver rod 6 and continue along this to the receiver sensor 5 to carry out the recording stage. <IMAGE>
FI871798A 1987-04-24 1987-04-24 ANLAEGGNING FOER ATT RAEKAN FISKAR EN I SAENDER. FI80529C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI871798A FI80529C (en) 1987-04-24 1987-04-24 ANLAEGGNING FOER ATT RAEKAN FISKAR EN I SAENDER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI871798A FI80529C (en) 1987-04-24 1987-04-24 ANLAEGGNING FOER ATT RAEKAN FISKAR EN I SAENDER.
FI871798 1987-04-24

Publications (4)

Publication Number Publication Date
FI871798A0 FI871798A0 (en) 1987-04-24
FI871798A true FI871798A (en) 1988-10-25
FI80529B FI80529B (en) 1990-02-28
FI80529C FI80529C (en) 1990-06-11

Family

ID=8524373

Family Applications (1)

Application Number Title Priority Date Filing Date
FI871798A FI80529C (en) 1987-04-24 1987-04-24 ANLAEGGNING FOER ATT RAEKAN FISKAR EN I SAENDER.

Country Status (1)

Country Link
FI (1) FI80529C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO300477B1 (en) * 1994-01-10 1997-06-02 Magnar Uthaug Method of counting fish, counting apparatus for fish for carrying out the method and using the method and counting apparatus

Also Published As

Publication number Publication date
FI80529B (en) 1990-02-28
FI80529C (en) 1990-06-11
FI871798A0 (en) 1987-04-24

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Owner name: KEMIJOKI OY