Wrong border colors on geom_bar plot in ggplot2

Question

I am plotting a bar chart of counts of fish in various length categories by sampling week.
Here is a bit of the database called Chin:

Trib    Week   Size2  
MM      21     90
SM      21     80
SM      22     100
NM      22     8p

I have converted Size2 to a factor called Fork, and week to a factor called period.

Here is my code:

period<-as.factor(Chin$week)
Chin1<-cbind(Chin, period)
Fork<-as.factor(Chin$Size2)

g <- ggplot(Chin1, aes(period))
g + geom_bar(aes(fill=Fork))+ theme(axis.text.x = element_text(angle=65, 
 vjust=0.6)) +  theme_bw() +scale_fill_manual(values=c("white","gray90", 
"gray82", "gray61", "gray48", "black"))

This works great except there is no border around the bars or the elements of the legend:

But when I add colour="black" in this line to get black borders:

g + geom_bar(aes(fill=Fork, colour="black"))+ theme(axis.text.x 
element_text(angle=65, vjust=0.6))....

I instead get red borders with a new legend with an item called "black" I get this no matter what color I choose. The name of the legend item changes (i.e. blue, green) but the border color stays red and the legend item fill is still black. See below. I know this must be a simple silly mistake, but I cannot figure it out. Any ideas? Thanks in advance!

Answer 1

Move the colour="black" outside the aes() statement. aes() uses variables from your data to create aesthetics, so you're saying to base color off of the column "black", which doesn't exist.

Also found here