Vitenskapelig navn på 1495 europeiske marine dyr og planter med NODC tallkode, norsk og engelsk navn

Rapporten forklarer prinsippet for den taksonomiske 10-siffers tallkoden fra National Oceanographic Data Center (NODC), USA. Det er fire kataloger i rapporten. En er sortert etter tallkoden, en etter vitenskapelig navn, en etter norsk navn og en etter engelsk navn. Fire dataprogram som leser og oversetter tallkoder til Ønsket type navn er tatt med

Mackerel egg investigations in the North Sea

This paper deals with the mackerel egg investigations in the North Sea in 1982 and 1983. The egg production is estimated by a computerized method. The confidence limits of the egg samples were estimated at 20-30%. The optimum future distribution of sampling effort in the area is calculated according to Neyman allocation. A comparison of the fecundity of mackerel from different areas measured by different methods is done. The size of the North Sea spawning stock is estimated based on the egg surveys and the fecundity studies

A program for estimation of number and survival of a population, given a series of tag release/recapture data.

A computer program for convenient storage of tag release/recapture data is given. The program provides a facility to combine yearclasses if release/recapture are split into yearclasses. One estimate of number and three different estimates of survival are printed as output. Tables of release/recaptures of tags in different years and absolute and relative tagging densitites together with a table of catch statistics are also given. The program is interactive and presupposes no knowlegde of programming

Gastric evacuation rate in mackerel (Scomber scombrus L.)

About 1500 mackerel, 25-45 cm in Length, were kept in a net for l0 days. In two experiments the fish were £ed frozen euphausiids -ad. libiturn, and the wet weight of the stomach content determined every second hour for 20-30 hours. The l' stomachs were then almost empty. Independent of fish size, the rate of digestion was related to the water temperature (14.5 - 17.0~~: )f (T)= 0.005 Oexp (0.2-T). The niaximum l stomach capacity (wet weight, grams) was a function of fish l size (total length, cm): w = 0.0087eL 2,21

Report of the meeting of the coordinators of the North Sea stomach sampling project 1981 [IJmuiden, 12 -16 July, 1982]

Contributor: Trond Westgår