Observations on gillnet catches of Kariba tilapia, Oreochromis mortimeri from Bumi Basin of Lake Kariba, Zimbabwe
Gillnet catches of Oreochromis mortimeri (Trewavas) were studied in the Bumi Basin of Lake Kariba in 1988 and 1989. Total length (TL) was positively correlated with standard length (SL). The linear relationship between TL and SL was TL=1.91 + 1.22 SL (r super(2)=0.982). The relationship between SL and weight in g (W) was of the form W = 0.12 SL super(2.67). Maximum standard length (L sub(max)) was 33 cm and asymptotic length (L sub( infinity )) was 34.7 cm. Monthly ratios of male to female varied between 0.6:1 and 13:1. The mean ratio was 57.4% male: 42.6%female. Monthly condition factors varied between 3.19 and 5.11 in males, and between 3.18 and 5.14 in females. Catches were higher in 1989 compared to 1988 and possible reasons for these differences are discussed.
Main Author: | |
---|---|
Format: | article biblioteca |
Language: | English |
Published: |
1998
|
Subjects: | Fisheries, Gillnets, Catch/effort, Length, Length-weight relationships, Sex ratio, Lake fisheries, Kariba Lake, Zimbabwe, Oreochromis mortimeri, |
Online Access: | http://hdl.handle.net/1834/25961 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
dig-aquadocs-1834-25961 |
---|---|
record_format |
koha |
spelling |
dig-aquadocs-1834-259612021-07-05T02:09:31Z Observations on gillnet catches of Kariba tilapia, Oreochromis mortimeri from Bumi Basin of Lake Kariba, Zimbabwe Mhlanga, W. Fisheries Gillnets Catch/effort Length Length-weight relationships Sex ratio Lake fisheries Kariba Lake Zimbabwe Oreochromis mortimeri Gillnet catches of Oreochromis mortimeri (Trewavas) were studied in the Bumi Basin of Lake Kariba in 1988 and 1989. Total length (TL) was positively correlated with standard length (SL). The linear relationship between TL and SL was TL=1.91 + 1.22 SL (r super(2)=0.982). The relationship between SL and weight in g (W) was of the form W = 0.12 SL super(2.67). Maximum standard length (L sub(max)) was 33 cm and asymptotic length (L sub( infinity )) was 34.7 cm. Monthly ratios of male to female varied between 0.6:1 and 13:1. The mean ratio was 57.4% male: 42.6%female. Monthly condition factors varied between 3.19 and 5.11 in males, and between 3.18 and 5.14 in females. Catches were higher in 1989 compared to 1988 and possible reasons for these differences are discussed. 2021-06-24T16:23:01Z 2021-06-24T16:23:01Z 1998 article 0116-290X http://hdl.handle.net/1834/25961 en http://www.worldfishcenter.org/Naga/na_2312.pdf application/pdf application/pdf 57-60 http://aquaticcommons.org/id/eprint/9351 115 2012-12-01 07:08:09 9351 WorldFish Center |
institution |
UNESCO |
collection |
DSpace |
country |
Francia |
countrycode |
FR |
component |
Bibliográfico |
access |
En linea |
databasecode |
dig-aquadocs |
tag |
biblioteca |
region |
Europa del Oeste |
libraryname |
Repositorio AQUADOCS |
language |
English |
topic |
Fisheries Gillnets Catch/effort Length Length-weight relationships Sex ratio Lake fisheries Kariba Lake Zimbabwe Oreochromis mortimeri Fisheries Gillnets Catch/effort Length Length-weight relationships Sex ratio Lake fisheries Kariba Lake Zimbabwe Oreochromis mortimeri |
spellingShingle |
Fisheries Gillnets Catch/effort Length Length-weight relationships Sex ratio Lake fisheries Kariba Lake Zimbabwe Oreochromis mortimeri Fisheries Gillnets Catch/effort Length Length-weight relationships Sex ratio Lake fisheries Kariba Lake Zimbabwe Oreochromis mortimeri Mhlanga, W. Observations on gillnet catches of Kariba tilapia, Oreochromis mortimeri from Bumi Basin of Lake Kariba, Zimbabwe |
description |
Gillnet catches of Oreochromis mortimeri (Trewavas) were studied in the Bumi Basin of Lake Kariba in 1988 and 1989. Total length (TL) was positively correlated with standard length (SL). The linear relationship between TL and SL was TL=1.91 + 1.22 SL (r super(2)=0.982). The relationship between SL and weight in g (W) was of the form W = 0.12 SL super(2.67). Maximum standard length (L sub(max)) was 33 cm and asymptotic length (L sub( infinity )) was 34.7 cm. Monthly ratios of male to female varied between 0.6:1 and 13:1. The mean ratio was 57.4% male: 42.6%female. Monthly condition factors varied between 3.19 and 5.11 in males, and between 3.18 and 5.14 in females. Catches were higher in 1989 compared to 1988 and possible reasons for these differences are discussed. |
format |
article |
topic_facet |
Fisheries Gillnets Catch/effort Length Length-weight relationships Sex ratio Lake fisheries Kariba Lake Zimbabwe Oreochromis mortimeri |
author |
Mhlanga, W. |
author_facet |
Mhlanga, W. |
author_sort |
Mhlanga, W. |
title |
Observations on gillnet catches of Kariba tilapia, Oreochromis mortimeri from Bumi Basin of Lake Kariba, Zimbabwe |
title_short |
Observations on gillnet catches of Kariba tilapia, Oreochromis mortimeri from Bumi Basin of Lake Kariba, Zimbabwe |
title_full |
Observations on gillnet catches of Kariba tilapia, Oreochromis mortimeri from Bumi Basin of Lake Kariba, Zimbabwe |
title_fullStr |
Observations on gillnet catches of Kariba tilapia, Oreochromis mortimeri from Bumi Basin of Lake Kariba, Zimbabwe |
title_full_unstemmed |
Observations on gillnet catches of Kariba tilapia, Oreochromis mortimeri from Bumi Basin of Lake Kariba, Zimbabwe |
title_sort |
observations on gillnet catches of kariba tilapia, oreochromis mortimeri from bumi basin of lake kariba, zimbabwe |
publishDate |
1998 |
url |
http://hdl.handle.net/1834/25961 |
work_keys_str_mv |
AT mhlangaw observationsongillnetcatchesofkaribatilapiaoreochromismortimerifrombumibasinoflakekaribazimbabwe |
_version_ |
1756078099456327680 |